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Interest and Other Expense, Net - Interest and Other Expense, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Other Income and Expenses [Abstract]      
Interest income $ (4,233) $ (6,225) $ (6,602)
Interest expense 10,427 3,911 2,764
Foreign exchange loss 3,382 7,860 6,173
Other, net 1,860 (3,687) 4,431
Total $ 11,436 $ 1,859 $ 6,766