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Reclassifications out of Accumulated Other Comprehensive Loss (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Amounts Reclassified from Accumulated Other Comprehensive Loss                      
Income before income tax expense $ 94,300 $ 82,800 $ 57,700 $ 80,000 $ 114,000 $ 101,400 $ 68,700 $ 51,700 $ 314,788 $ 335,774 $ 17,483
Income tax expense (29,600) (13,700) (15,200) (23,500) (35,800) (30,100) (14,000) (12,700) (82,024) (92,578) (74,416)
Net income (loss) 64,700 69,100 42,500 56,500 78,200 71,300 54,700 39,000 232,764 243,196 (56,933)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
                      
Amounts Reclassified from Accumulated Other Comprehensive Loss                      
Income tax expense                 (1,200) (1,200) (900)
Net income (loss)                 1,700 1,800 1,300
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Expense [Member]
                      
Amounts Reclassified from Accumulated Other Comprehensive Loss                      
Income before income tax expense                 2,900 3,000 2,200
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income [Member]
                      
Amounts Reclassified from Accumulated Other Comprehensive Loss                      
Income tax expense                 (2,600) (2,700) (1,700)
Net income (loss)                 6,100 5,300 3,000
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales and General and Administrative Expense [Member]
                      
Amounts Reclassified from Accumulated Other Comprehensive Loss                      
Income before income tax expense                 $ 8,700 $ 8,000 $ 4,700