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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Statement of Comprehensive Income [Abstract] |  |  |
Tax benefit (expense) on change in fair value of cash flow hedges | $ 362 | $ 2,076 | $ 3,369
Tax (expense) benefit on unrealized gain (loss) on defined benefit plan | (93) | (80) | (1,461)
Tax benefit (expense) on income loss | $ 0 | $ 0 | $ 0

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