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Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated balances |  |  |
Balance at the beginning of the period | $ (926,577) |  |
Balance at the end of the period | (882,671) | $ (926,577) |
Pension Related Adjustments |  |  |
Accumulated balances |  |  |
Balance at the beginning of the period | (226,000) | (217,300) | $ (316,200)
Other comprehensive income (loss) before reclassification | (26,600) | (10,900) | 89,900
Amounts reclassified from accumulated other comprehensive loss | 600 | 2,200 | 9,000
Balance at the end of the period | (252,000) | (226,000) | (217,300)
Foreign Currency Translation Adjustments |  |  |
Accumulated balances |  |  |
Balance at the beginning of the period | (739,700) | (799,300) | (580,100)
Other comprehensive income (loss) before reclassification | 93,200 | 59,600 | (238,700)
Amounts reclassified from accumulated other comprehensive loss |  |  | 19,500
Balance at the end of the period | (646,500) | (739,700) | (799,300)
Loss on Derivative Instruments |  |  |
Accumulated balances |  |  |
Balance at the beginning of the period | 39,100 | 36,900 | (4,100)
Other comprehensive income (loss) before reclassification | (10,600) | 10,700 | 37,900
Amounts reclassified from accumulated other comprehensive loss | (12,700) | (8,500) | 3,100
Balance at the end of the period | 15,800 | 39,100 | 36,900
Accumulated Other Comprehensive Loss |  |  |
Accumulated balances |  |  |
Balance at the beginning of the period | (926,600) | (979,700) | (900,400)
Other comprehensive income (loss) before reclassification | 56,000 | 59,400 | (110,900)
Amounts reclassified from accumulated other comprehensive loss | (12,100) | (6,300) | 31,600
Balance at the end of the period | $ (882,700) | $ (926,600) | $ (979,700)

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