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Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated balances    
Balance at the beginning of the period $ (864,197) $ (703,300)
Other comprehensive income (loss) before reclassification (96,400) (170,900)
Amounts reclassified from accumulated other comprehensive loss 41,900 10,000
Balance at the end of the period (918,674) (864,197)
Pension Related Adjustments    
Accumulated balances    
Balance at the beginning of the period (302,700) (202,300)
Other comprehensive income (loss) before reclassification (72,500) (107,200)
Amounts reclassified from accumulated other comprehensive loss 32,400 6,800
Balance at the end of the period (342,800) (302,700)
Foreign Currency Translation Adjustments    
Accumulated balances    
Balance at the beginning of the period (548,700) (502,200)
Other comprehensive income (loss) before reclassification (18,600) (46,500)
Balance at the end of the period (567,300) (548,700)
Loss on Derivative Instruments    
Accumulated balances    
Balance at the beginning of the period (12,800) 1,200
Other comprehensive income (loss) before reclassification (5,300) (17,200)
Amounts reclassified from accumulated other comprehensive loss 9,500 3,200
Balance at the end of the period $ (8,600) $ (12,800)