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Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Total assets by segment    
Consolidated assets $ 4,782,800us-gaap_Assets $ 4,819,122us-gaap_Assets
Reportable Business Segments    
Total assets by segment    
Consolidated assets 3,981,561us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
4,068,753us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Corporate/Manufacturing    
Total assets by segment    
Consolidated assets 801,239us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
750,369us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Wholesale segment | Reportable Business Segments    
Total assets by segment    
Consolidated assets 2,469,040us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember
2,500,659us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember
European Retail | Reportable Business Segments    
Total assets by segment    
Consolidated assets 890,472us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_EuropeanRetailMember
948,010us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_EuropeanRetailMember
Direct Response / E-Commerce | Reportable Business Segments    
Total assets by segment    
Consolidated assets 513,248us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_DirectResponseOrECommerceMember
512,642us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_DirectResponseOrECommerceMember
North American Retail | Reportable Business Segments    
Total assets by segment    
Consolidated assets $ 108,801us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_NorthAmericanRetailMember
$ 107,442us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= nty_NorthAmericanRetailMember