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Business and Credit Concentration (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Customer B      
Business and Credit Concentration      
Percentage of concentration risk 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= nty_CustomerBMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= nty_CustomerBMember		  
Customer concentration risk | Customer A      
Business and Credit Concentration      
Percentage of concentration risk 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerAMember		 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerAMember		  
Customer concentration risk | Customer C      
Business and Credit Concentration      
Percentage of concentration risk 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerCMember		 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerCMember		  
Net sales | Customer B | Wholesale segment      
Business and Credit Concentration      
Percentage of concentration risk 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		  
Net sales | Customer concentration risk | Customer A | Wholesale segment      
Business and Credit Concentration      
Percentage of concentration risk 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		  
Net sales | Customer concentration risk | Customer C | Wholesale segment      
Business and Credit Concentration      
Percentage of concentration risk 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerCMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerCMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		  
Gross accounts receivable | Customer concentration risk | Customer A | Wholesale segment      
Business and Credit Concentration      
Percentage of concentration risk 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		   13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember
Gross accounts receivable | Customer concentration risk | Customer B | Wholesale segment      
Business and Credit Concentration      
Percentage of concentration risk 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		   11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember
Gross accounts receivable | Customer concentration risk | Customer C | Wholesale segment      
Business and Credit Concentration      
Percentage of concentration risk 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerCMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		   9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nty_CustomerCMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember