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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Changes in goodwill    
Balance at the beginning of the period $ 1,163,282us-gaap_Goodwill  
Foreign currency translation (44,415)us-gaap_GoodwillTranslationAdjustments  
Balance at the end of the period 1,118,867us-gaap_Goodwill  
European Retail    
Changes in goodwill    
Balance at the beginning of the period 321,257us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_EuropeanRetailMember		  
Foreign currency translation (32,839)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= nty_EuropeanRetailMember		  
Balance at the end of the period 288,418us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_EuropeanRetailMember		  
Direct Response / E-Commerce    
Changes in goodwill    
Balance at the beginning of the period   203,395us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_DirectResponseOrECommerceMember
Balance at the end of the period 203,395us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_DirectResponseOrECommerceMember		 203,395us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_DirectResponseOrECommerceMember
Wholesale segment    
Changes in goodwill    
Balance at the beginning of the period 638,630us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		  
Foreign currency translation (11,576)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember		  
Balance at the end of the period $ 627,054us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nty_WholesaleMember