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Amortization Expense Associated with Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets $ 2,908 [1] $ 3,604 [1] $ 5,921 [1] $ 6,976 [1]
Cost of revenues
        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets 1,823 1,673 3,622 3,144
Selling, general and administrative expenses
        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets $ 1,085 $ 1,931 $ 2,299 $ 3,832
[1] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 4 to the condensed consolidated financial statements.