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Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Accumulated balances      
Balance at the beginning of the period $ (979,675)    
Balance at the end of the period (926,577) $ (979,675)  
Pension Related Adjustments      
Accumulated balances      
Balance at the beginning of the period (217,300) (316,200) $ (342,800)
Other comprehensive income (loss) before reclassification (10,900) 89,900 14,600
Amounts reclassified from accumulated other comprehensive income (loss) 2,200 9,000 12,000
Balance at the end of the period (226,000) (217,300) (316,200)
Foreign Currency Translation Adjustments      
Accumulated balances      
Balance at the beginning of the period (799,300) (580,100) (567,300)
Other comprehensive income (loss) before reclassification 59,600 (238,700) (12,800)
Amounts reclassified from accumulated other comprehensive income (loss)   19,500  
Balance at the end of the period (739,700) (799,300) (580,100)
Loss on Derivative Instruments      
Accumulated balances      
Balance at the beginning of the period 36,900 (4,100) (8,600)
Other comprehensive income (loss) before reclassification 10,700 37,900 800
Amounts reclassified from accumulated other comprehensive income (loss) (8,500) 3,100 3,700
Balance at the end of the period 39,100 36,900 (4,100)
Accumulated Other Comprehensive Loss      
Accumulated balances      
Balance at the beginning of the period (979,700) (900,400) (918,700)
Other comprehensive income (loss) before reclassification 59,400 (110,900) 2,600
Amounts reclassified from accumulated other comprehensive income (loss) (6,300) 31,600 15,700
Balance at the end of the period $ (926,600) $ (979,700) $ (900,400)