Amortization Expense Associated with Intangible Assets (Detail) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	[1]	$ 3,580	$ 2,932
Cost of revenues
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets		1,907	1,836
Selling, general and administrative expenses
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets		$ 1,673	$ 1,096

[1] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 4.