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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Income Taxes                      
Income (loss) from domestic operations before income tax expense                 $ 111,800,000 $ (89,200,000) $ 148,000,000
Income from foreign operations before income tax expense                 224,000,000 106,700,000 236,200,000
Current:                      
Federal                 30,300,000 29,300,000 500,000
State                 9,900,000 2,100,000 12,100,000
Foreign                 59,700,000 63,300,000 58,300,000
Total current income tax expense                 99,900,000 94,700,000 70,900,000
Deferred:                      
Federal                 5,800,000 (19,200,000) 38,500,000
State                 (10,600,000) 600,000 (8,700,000)
Foreign                 (2,500,000) (1,700,000) (600,000)
Total deferred income tax (benefit) expense                 (7,210,000) (20,303,000) 29,200,000
Total income tax expense 35,800,000 30,100,000 14,000,000 12,700,000 16,700,000 21,400,000 16,700,000 19,600,000 92,578,000 74,416,000 100,090,000
Major elements contributing to the difference between the U.S. federal statutory rate of 35.0% and the effective tax rate                      
Tax at federal statutory rate                 117,500,000 6,100,000 134,500,000
State income tax, net of federal benefit                 2,500,000 1,100,000 6,900,000
U.S. income tax credits                 (13,400,000) (4,100,000) (11,100,000)
Foreign tax rate differential                 (9,900,000) (25,400,000) (19,500,000)
Foreign Research and Experimentation credits                 (3,900,000) (5,800,000) (6,100,000)
Tax audits                   2,100,000  
Goodwill impairment                   101,100,000  
Change in uncertain tax positions                 (7,300,000) (4,100,000) 1,900,000
Valuation allowance                 1,600,000 500,000 (3,100,000)
Other items, net                 5,500,000 2,900,000 (3,400,000)
Total income tax expense $ 35,800,000 $ 30,100,000 $ 14,000,000 $ 12,700,000 $ 16,700,000 $ 21,400,000 $ 16,700,000 $ 19,600,000 $ 92,578,000 $ 74,416,000 $ 100,090,000
Major elements contributing to the difference between the U.S. federal statutory rate of 35.0% and the effective tax rate                      
Tax at federal statutory rate (as a percent)                 35.00% 35.00% 35.00%
State income tax, net of federal benefit (as a percent)                 0.70% 6.30% 1.80%
U.S. income tax credits (as a percent)                 (4.00%) (23.40%) (2.90%)
Foreign tax rate differential (as a percent)                 (2.90%) (145.10%) (5.00%)
Foreign Research and Experimentation credits (as a percent)                 (1.10%) (33.30%) (1.60%)
Tax audits (as a percent)                   12.00%  
Goodwill impairment (as a percent)                   578.30%  
Change in uncertain tax positions (as a percent)                 (2.20%) (23.40%) 0.50%
Valuation allowance (as a percent)                 0.50% 2.70% (0.80%)
Other items, net (as a percent)                 1.60% 16.60% (0.90%)
Effective tax rate (as a percent)                 27.60% 425.70% 26.10%