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Reclassifications out of Accumulated Other Comprehensive Loss (Details) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Accumulated balances      
Balance at the beginning of the period $ (261,299,000) $ (179,200,000) $ (187,600,000)
Other comprehensive income before reclassification (103,100,000) (89,200,000) 4,100,000
Amounts reclassified from accumulated other comprehensive loss, actuarial losses, net of tax 6,100,000 5,300,000 3,000,000
Balance at the end of the period (356,602,000) (261,299,000) (179,200,000)
Actuarial losses
     
Accumulated balances      
Balance at the beginning of the period (192,800,000) (178,200,000) (136,500,000)
Other comprehensive income before reclassification (30,300,000) (19,900,000) (44,700,000)
Amounts reclassified from accumulated other comprehensive loss, actuarial losses, net of tax 6,100,000 5,300,000 3,000,000
Balance at the end of the period (217,000,000) (192,800,000) (178,200,000)
Accumulated Translation Adjustment [Member]
     
Accumulated balances      
Balance at the beginning of the period (66,400,000) 2,700,000 (51,100,000)
Other comprehensive income before reclassification (71,400,000) (69,100,000) 53,800,000
Balance at the end of the period (137,800,000) (66,400,000) 2,700,000
Cash flow hedges
     
Accumulated balances      
Balance at the beginning of the period (2,100,000) (3,700,000)  
Other comprehensive income before reclassification (1,400,000) (200,000) (5,000,000)
Amounts reclassified from accumulated other comprehensive loss, cash flow hedge losses, net of tax 1,700,000 1,800,000 1,300,000
Balance at the end of the period $ (1,800,000) $ (2,100,000) $ (3,700,000)