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Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accumulated balances      
Balance at the beginning of the period $ (900,377)    
Balance at the end of the period (979,675) $ (900,377)  
Pension Related Adjustments      
Accumulated balances      
Balance at the beginning of the period (316,200) (342,800) $ (302,700)
Other comprehensive income (loss) before reclassification 89,900 14,600 (72,500)
Amounts reclassified from accumulated other comprehensive loss 9,000 12,000 32,400
Balance at the end of the period (217,300) (316,200) (342,800)
Foreign Currency Translation Adjustments      
Accumulated balances      
Balance at the beginning of the period (580,100) (567,300) (548,700)
Other comprehensive income (loss) before reclassification (238,700) (12,800) (18,600)
Amounts reclassified from accumulated other comprehensive loss 19,500    
Balance at the end of the period (799,300) (580,100) (567,300)
Loss on Derivative Instruments      
Accumulated balances      
Balance at the beginning of the period (4,100) (8,600) (12,800)
Other comprehensive income (loss) before reclassification 37,900 800 (5,300)
Amounts reclassified from accumulated other comprehensive loss 3,100 3,700 9,500
Balance at the end of the period 36,900 (4,100) (8,600)
Accumulated Other Comprehensive Loss      
Accumulated balances      
Balance at the beginning of the period (900,400) (918,700) (864,200)
Other comprehensive income (loss) before reclassification (110,900) 2,600 (96,400)
Amounts reclassified from accumulated other comprehensive loss 31,600 15,700 41,900
Balance at the end of the period $ (979,700) $ (900,400) $ (918,700)