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Interest and Other Expense, Net - Interest and Other Expense, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Interest and other expense, net      
Interest income $ (4,822) $ (4,233) $ (6,225)
Interest expense 21,275 10,427 3,911
Foreign exchange loss 1,110 3,382 7,860
Other, net (6,766) 1,860 (3,687)
Total $ 10,797 $ 11,436 $ 1,859