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Goodwill and Intangible Assets - Additional Information (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
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 545 $ 492 $ 1,635 $ 1,544