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Interest and Other Expense, Net - Interest and Other Expense, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Other Income and Expenses [Abstract]      
Interest income $ (4,615) $ (4,075) $ (4,915)
Interest expense 3,142 3,483 3,557
Foreign exchange loss 8,130 3,447 4,279
Other, net (4,113) 3,243 3,154
Total $ 2,544 $ 6,098 $ 6,075