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Customers with 10% (or greater) of Net Revenues - Additional Information (Detail) (Sales Revenue, Net [Member])
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Sales Revenue, Net [Member]
       
Concentration Risk [Line Items]        
Net revenues concentration risk, percentage 24.70% 26.70% 22.30% 21.60%