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Condensed Consolidating Financial Statements of Guarantors (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Condensed Parent Company Statements of Operations and Comprehensive Income (Loss)        
Net sales $ 787,876us-gaap_SalesRevenueGoodsNet $ 779,026us-gaap_SalesRevenueGoodsNet $ 1,613,647us-gaap_SalesRevenueGoodsNet $ 1,606,131us-gaap_SalesRevenueGoodsNet
Costs and expenses:        
Cost of sales 438,864us-gaap_CostOfGoodsSold 431,081us-gaap_CostOfGoodsSold 884,044us-gaap_CostOfGoodsSold 872,799us-gaap_CostOfGoodsSold
Advertising, promotion and catalog 58,505us-gaap_MarketingAndAdvertisingExpense 58,783us-gaap_MarketingAndAdvertisingExpense 105,399us-gaap_MarketingAndAdvertisingExpense 97,305us-gaap_MarketingAndAdvertisingExpense
Selling, general and administrative 235,460us-gaap_SellingGeneralAndAdministrativeExpense 238,894us-gaap_SellingGeneralAndAdministrativeExpense 473,632us-gaap_SellingGeneralAndAdministrativeExpense 471,577us-gaap_SellingGeneralAndAdministrativeExpense
Facility restructuring charges (See Note 2) 4,418us-gaap_RestructuringCharges   4,418us-gaap_RestructuringCharges  
Total costs and expenses 737,247us-gaap_CostsAndExpenses 728,758us-gaap_CostsAndExpenses 1,467,493us-gaap_CostsAndExpenses 1,441,681us-gaap_CostsAndExpenses
Income from operations 50,629us-gaap_OperatingIncomeLoss 50,268us-gaap_OperatingIncomeLoss 146,154us-gaap_OperatingIncomeLoss 164,450us-gaap_OperatingIncomeLoss
Other income (expense):        
Interest (32,426)us-gaap_InterestExpense (33,086)us-gaap_InterestExpense (67,173)us-gaap_InterestExpense (67,904)us-gaap_InterestExpense
Miscellaneous, net 2,525us-gaap_NonoperatingIncomeExpense (1,714)us-gaap_NonoperatingIncomeExpense 1,170us-gaap_NonoperatingIncomeExpense (725)us-gaap_NonoperatingIncomeExpense
Total other income (expense) (29,901)nty_InterestAndNonOperatingIncomeExpense (34,800)nty_InterestAndNonOperatingIncomeExpense (66,003)nty_InterestAndNonOperatingIncomeExpense (68,629)nty_InterestAndNonOperatingIncomeExpense
Income from operations before income taxes 20,728us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 15,468us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 80,151us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 95,821us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 7,472us-gaap_IncomeTaxExpenseBenefit 5,568us-gaap_IncomeTaxExpenseBenefit 28,705us-gaap_IncomeTaxExpenseBenefit 32,100us-gaap_IncomeTaxExpenseBenefit
Net income 13,256us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 9,900us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 51,446us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 63,721us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive (loss) income, net of tax:        
Foreign currency translation adjustment, net of tax (52,455)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (706)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (82,761)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 11,489us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Change in fair value of interest rate swaps, net of tax   684us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent 721us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent 1,769us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
Total other comprehensive (loss) income, net of tax (52,455)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (22)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (82,040)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 13,258us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive (loss) income (39,199)us-gaap_ComprehensiveIncomeNetOfTax 9,878us-gaap_ComprehensiveIncomeNetOfTax (30,594)us-gaap_ComprehensiveIncomeNetOfTax 76,979us-gaap_ComprehensiveIncomeNetOfTax
Reportable Legal Entities | Parent Company        
Costs and expenses:        
Selling, general and administrative 27,269us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
27,813us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
50,159us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
50,085us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total costs and expenses 27,269us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
27,813us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
50,159us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
50,085us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income from operations (27,269)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(27,813)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(50,159)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(50,085)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other income (expense):        
Intercompany interest (67,428)nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(39,121)nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(107,237)nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(78,829)nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest (62,709)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(34,204)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(97,490)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(69,002)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Miscellaneous, net 401us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
95us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,345)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,005us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total other income (expense) 5,120nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,012nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,402nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,832nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income from operations before income taxes (22,149)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(22,801)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(41,757)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(39,253)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Provision for income taxes (2,334)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
51us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,499)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,318)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in income of subsidiaries 33,071nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
32,752nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
89,704nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
97,656nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income 13,256us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,900us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
51,446us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63,721us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive (loss) income, net of tax:        
Foreign currency translation adjustment, net of tax (52,455)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(706)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(82,761)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,489us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Change in fair value of interest rate swaps, net of tax   684us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
721us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,769us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total other comprehensive (loss) income, net of tax (52,455)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(22)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(82,040)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,258us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive (loss) income (39,199)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,878us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(30,594)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
76,979us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Reportable Legal Entities | Guarantor Subsidiaries        
Condensed Parent Company Statements of Operations and Comprehensive Income (Loss)        
Net sales 517,461us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
514,810us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,074,822us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,085,876us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Costs and expenses:        
Cost of sales 324,196us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
330,923us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
663,142us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
672,791us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Advertising, promotion and catalog 44,655us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
47,709us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
79,602us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
76,823us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Selling, general and administrative 110,835us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
113,790us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
225,772us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
230,670us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Facility restructuring charges (See Note 2) 4,418us-gaap_RestructuringCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
  4,418us-gaap_RestructuringCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Total costs and expenses 484,104us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
492,422us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
972,934us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
980,284us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Income from operations 33,357us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
22,388us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
101,888us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
105,592us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other income (expense):        
Intercompany interest 62,709nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
34,204nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
97,490nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
69,002nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Interest 30,298us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
605us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
30,363us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
605us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Miscellaneous, net 183us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,653)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(660)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(701)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Total other income (expense) (32,228)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(35,252)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(67,787)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(69,098)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Income from operations before income taxes 1,129us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(12,864)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
34,101us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
36,494us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Provision for income taxes 412us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(5,843)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12,447us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12,773us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Equity in income of subsidiaries 6,971nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
7,480nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
13,304nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
13,646nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net income 7,688us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
459us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
34,958us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
37,367us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other comprehensive (loss) income, net of tax:        
Foreign currency translation adjustment, net of tax (8,115)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,398us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(13,796)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,603us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Change in fair value of interest rate swaps, net of tax   684us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
721us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,769us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Total other comprehensive (loss) income, net of tax (8,115)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,082us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(13,075)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,372us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Comprehensive (loss) income (427)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,541us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
21,883us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
42,739us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Reportable Legal Entities | Guarantor Subsidiaries | Adjustments        
Other income (expense):        
Net income   7,480us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
  13,646us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
Reportable Legal Entities | Non-Guarantor Subsidiaries        
Condensed Parent Company Statements of Operations and Comprehensive Income (Loss)        
Net sales 283,597us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
289,468us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
572,614us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
574,609us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Costs and expenses:        
Cost of sales 127,850us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
125,410us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
254,691us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
254,362us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Advertising, promotion and catalog 13,850us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11,074us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
25,797us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
20,482us-gaap_MarketingAndAdvertisingExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Selling, general and administrative 97,356us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
97,291us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
197,701us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
190,822us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Total costs and expenses 239,056us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
233,775us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
478,189us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
465,666us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Income from operations 44,541us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
55,693us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
94,425us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
108,943us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other income (expense):        
Intercompany interest 4,719nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
4,917nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
9,747nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
9,827nty_IntercompanyInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Interest (15)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
513us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(46)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
493us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Miscellaneous, net 1,941us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(156)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3,175us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(1,029)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Total other income (expense) (2,793)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(4,560)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(6,618)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(10,363)nty_InterestAndNonOperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Income from operations before income taxes 41,748us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
51,133us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
87,807us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
98,580us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Provision for income taxes 9,394us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11,360us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
19,757us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
24,645us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net income 32,354us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
39,773us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
68,050us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
73,935us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive (loss) income, net of tax:        
Foreign currency translation adjustment, net of tax (53,604)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,486us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(84,051)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8,429us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Total other comprehensive (loss) income, net of tax (53,604)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,486us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(84,051)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8,429us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive (loss) income (21,250)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
41,259us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(16,001)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
82,364us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Eliminations        
Condensed Parent Company Statements of Operations and Comprehensive Income (Loss)        
Net sales (13,182)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(25,252)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(33,789)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(54,354)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Costs and expenses:        
Cost of sales (13,182)us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(25,252)us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(33,789)us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(54,354)us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Total costs and expenses (13,182)us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(25,252)us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(33,789)us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(54,354)us-gaap_CostsAndExpenses
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Other income (expense):        
Equity in income of subsidiaries (40,042)nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(40,232)nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(103,008)nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(111,302)nty_EquityInIncomeOfSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net income (40,042)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(40,232)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(103,008)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(111,302)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Other comprehensive (loss) income, net of tax:        
Foreign currency translation adjustment, net of tax 61,719us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,884)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
97,847us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(12,032)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Change in fair value of interest rate swaps, net of tax   (684)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(721)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1,769)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Total other comprehensive (loss) income, net of tax 61,719us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(3,568)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
97,126us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(13,801)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Comprehensive (loss) income 21,677us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(43,800)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(5,882)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(125,103)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Eliminations | Adjustments        
Other income (expense):        
Net income   $ (7,480)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
  $ (13,646)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember