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Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Accumulated balances        
Balance at the beginning of the period     $ (926,577)  
Balance at the end of the period $ (909,970)   (909,970)  
Pension Related Adjustments        
Accumulated balances        
Balance at the beginning of the period (235,000) $ (232,100) (226,000) $ (217,300)
Other comprehensive (loss) income before reclassification 1,900 (4,200) (7,200) (19,600)
Amounts reclassified from accumulated other comprehensive income (loss) 100 500 200 1,100
Balance at the end of the period (233,000) (235,800) (233,000) (235,800)
Foreign Currency Translation Adjustments        
Accumulated balances        
Balance at the beginning of the period (679,700) (721,400) (739,700) (799,300)
Other comprehensive (loss) income before reclassification (27,000) 8,500 33,000 86,400
Balance at the end of the period (706,700) (712,900) (706,700) (712,900)
Gain/(Loss) on Derivative Instruments        
Accumulated balances        
Balance at the beginning of the period 24,900 35,100 39,100 36,900
Other comprehensive (loss) income before reclassification 8,300 (5,600) (2,300) (7,400)
Amounts reclassified from accumulated other comprehensive income (loss) (3,500) (1,900) (7,100) (1,900)
Balance at the end of the period 29,700 27,600 29,700 27,600
Accumulated Other Comprehensive Loss        
Accumulated balances        
Balance at the beginning of the period (889,800) (918,400) (926,600) (979,700)
Other comprehensive (loss) income before reclassification (16,800) (1,300) 23,500 59,400
Amounts reclassified from accumulated other comprehensive income (loss) (3,400) (1,400) (6,900) (800)
Balance at the end of the period $ (910,000) $ (921,100) $ (910,000) $ (921,100)