Amortization Expense Associated with Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 3,019	[1]	$ 3,477	[1]	$ 8,940	[1]	$ 10,453	[1]
Cost of revenues
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	1,880		1,739		5,502		4,883
Selling, general and administrative expenses
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 1,139		$ 1,738		$ 3,438		$ 5,570

[1] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 5 to the condensed consolidated financial statements.