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Income Taxes (Details) (USD $)
 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
Income Taxes                      
Income (loss) from domestic operations before income tax expense                 $ 138,200,000 $ 111,800,000 $ (89,200,000)
Income from foreign operations before income tax expense                 176,600,000 224,000,000 106,700,000
Current:                      
Federal                 5,300,000 30,300,000 29,300,000
State                 3,300,000 9,900,000 2,100,000
Foreign                 46,300,000 59,700,000 63,300,000
Total current income tax expense                 54,900,000 99,900,000 94,700,000
Deferred:                      
Federal                 27,700,000 5,800,000 (19,200,000)
State                 5,600,000 (10,600,000) 600,000
Foreign                 (6,200,000) (2,500,000) (1,700,000)
Total deferred income tax (benefit) expense                 27,155,000 (7,210,000) (20,303,000)
Total income tax expense 29,600,000 13,700,000 15,200,000 23,500,000 35,800,000 30,100,000 14,000,000 12,700,000 82,024,000 92,578,000 74,416,000
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                 110,200,000 117,500,000 6,100,000
State income tax, net of federal benefit                 5,000,000 2,500,000 1,100,000
U.S. income tax credits                 (3,500,000) (10,800,000) (2,900,000)
Foreign tax rate differential                 (22,500,000) (9,900,000) (25,400,000)
Foreign Research and Experimentation credits                 (3,600,000) (3,900,000) (5,800,000)
Goodwill impairment                     101,100,000
Change in uncertain tax positions                 (4,500,000) (7,300,000) (4,100,000)
Valuation allowance                 6,300,000 1,600,000 500,000
Domestic production activities                 (11,700,000) (2,600,000) (1,200,000)
Nondeductible transaction costs                 2,800,000   1,300,000
Other items, net                 3,500,000 5,500,000 3,700,000
Total income tax expense $ 29,600,000 $ 13,700,000 $ 15,200,000 $ 23,500,000 $ 35,800,000 $ 30,100,000 $ 14,000,000 $ 12,700,000 $ 82,024,000 $ 92,578,000 $ 74,416,000
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)                 1.60% 0.70% 6.30%
U.S. income tax credits (as a percent)                 (1.10%) (3.20%) (16.60%)
Foreign tax rate differential (as a percent)                 (7.20%) (2.90%) (145.10%)
Foreign Research and Experimentation credits (as a percent)                 (1.10%) (1.10%) (33.30%)
Goodwill impairment (as a percent)                     578.30%
Change in uncertain tax positions (as a percent)                 (1.40%) (2.20%) (23.40%)
Valuation allowance (as a percent)                 2.00% 0.50% 2.70%
Domestic production activities (as a percent)                 (3.70%) (0.80%) (6.80%)
Nondeductible transaction costs (as a percent)                 0.90%   7.60%
Other items, net (as a percent)                 1.10% 1.60% 21.00%
Effective tax rate (as a percent)                 26.10% 27.60% 425.70%