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Interest and Other Income (Expense), Net - Interest and Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Other Income and Expenses [Abstract]      
Interest income $ 7,972 $ 6,815 $ 4,615
Interest expense (1,600) (1,667) (3,142)
Foreign exchange loss (8,246) (1,998) (8,130)
Other, net (2,547) (1,593) 4,113
Total $ (4,421) $ 1,557 $ (2,544)