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Customers with 10% (or greater) of Net Revenues - Additional Information (Detail) (Entities Owned by a Global Company [Member], Revenue [Member])
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Entities Owned by a Global Company [Member] | Revenue [Member]
   
Concentration Risk [Line Items]    
Percentage of concentration 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
18.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember