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Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Accumulated balances        
Balance at the beginning of the period $ (704,200) $ (912,900) $ (700,661) $ (857,600)
Other comprehensive (loss) income before reclassification (5,400) 37,300 (11,700) (21,800)
Amounts reclassified from accumulated other comprehensive loss 2,600 4,000 5,400 7,800
Balance at the end of the period (707,000) (871,600) (707,000) (871,600)
Pension Related Adjustments        
Accumulated balances        
Balance at the beginning of the period (279,400) (352,000) (281,900) (368,900)
Other comprehensive (loss) income before reclassification (18,800) (4,600) (18,800) 9,100
Amounts reclassified from accumulated other comprehensive loss 2,700 3,100 5,200 6,300
Balance at the end of the period (295,500) (353,500) (295,500) (353,500)
Foreign Currency Translation Adjustments        
Accumulated balances        
Balance at the beginning of the period (425,200) (557,200) (418,400) (483,700)
Other comprehensive (loss) income before reclassification 15,000 40,400 8,200 (33,100)
Balance at the end of the period (410,200) (516,800) (410,200) (516,800)
Loss on Derivative Instruments        
Accumulated balances        
Balance at the beginning of the period 400 (3,700) (400) (5,000)
Other comprehensive (loss) income before reclassification (1,600) 1,500 (1,100) 2,200
Amounts reclassified from accumulated other comprehensive loss (100) 900 200 1,500
Balance at the end of the period $ (1,300) $ (1,300) $ (1,300) $ (1,300)