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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
(Loss) income from domestic operations before income tax expense                 $ (214,600) $ 138,200 $ 111,800
Income from foreign operations before income tax expense                 63,100 176,600 224,000
Current:                      
Federal                 (67,100) 5,300 30,300
State                 2,600 3,300 9,900
Foreign                 37,200 46,300 59,700
Total current income tax (benefit) expense                 (27,300) 54,900 99,900
Deferred:                      
Federal                 (44,200) 27,700 5,800
State                 1,200 5,600 (10,600)
Foreign                 (10,000) (6,200) (2,500)
Total deferred income tax (benefit) expense                 (53,034) 27,155 (7,210)
Total income tax (benefit) expense $ 16,100 $ (8,500) $ (75,800) $ (12,100) $ 29,600 $ 13,700 $ 15,200 $ 23,500 (80,237) 82,024 92,578
Major elements contributing to the difference between the U.S. federal statutory rate of 35.0% and the effective tax rate                      
Discrete benefit                 (53,000) 110,200 117,500
State income tax, net of federal benefit                 (2,300) 5,000 2,500
Exclusion of tax on non-controlling interests                 (29,300)    
Income tax credits and incentives                 (21,100) (7,100) (14,700)
Foreign tax rate differential                 (14,000) (22,500) (9,900)
Change in uncertain tax positions                 6,500 (4,500) (7,300)
Valuation allowance                 30,000 6,300 1,600
Domestic production activities                   (11,700) (2,600)
Nondeductible transaction costs                 2,800 2,800  
Other items, net                 100 3,500 5,500
Total income tax (benefit) expense $ 16,100 $ (8,500) $ (75,800) $ (12,100) $ 29,600 $ 13,700 $ 15,200 $ 23,500 $ (80,237) $ 82,024 $ 92,578
Major elements contributing to the difference between the U.S. federal statutory rate of 35.0% and the effective tax rate                      
Federal statutory rate (as a percent)                 35.00% 35.00% 35.00%
State income tax, net of federal benefit (as a percent)                 1.50% 1.60% 0.70%
Exclusion of tax on non-controlling interests (as a percent)                 19.30%    
U.S. income tax credits (as a percent)                 14.00% (2.20%) (4.30%)
Foreign tax rate differential (as a percent)                 9.30% (7.20%) (2.90%)
Change in uncertain tax positions (as a percent)                 (4.30%) (1.40%) (2.20%)
Valuation allowance (as a percent)                 (19.80%) 2.00% 0.50%
Domestic production activities (as a percent)                   (3.70%) (0.80%)
Nondeductible transaction costs (as a percent)                 (1.90%) 0.90%  
Other items, net (as a percent)                 (0.10%) 1.10% 1.60%
Effective tax rate (as a percent)                 53.00% 26.10% 27.60%