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Interest and Other Expense, Net - Interest and Other Expense, Net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Other Income and Expenses [Abstract] |  |  |  |  |
Interest income | [1] | $ (9,154) |  | $ (17,453) | $ (21,248)
Interest expense | [1] | 42,436 |  | 34,892 | 23,093
Foreign exchange loss | [2] | 5,932 |  | 13,212 | 12,057
Other, net |  | 792 |  | (6,886) | (3,727)
Total |  | $ 38,422 | [3] | $ 37,537 | $ 17,629
[1] | The net change in interest expense net of interest income, is primarily attributable to lower level cash balance. Interest expense also includes certain fees and for further details, please see Note 13 to the consolidated financial statements.
[2] | The Foreign exchange loss is primarily attributable to volatility of certain currencies’ exchange rates as well as to the cost of executing our hedging policy.
[3] | or further details see Note 22 "Segment Information and Revenue from Significant Customers".

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