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Income Taxes - Disclosures (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income (loss) from domestic operations before income tax expense                 $ 51,600 $ (214,600) $ 138,200
Income from foreign operations before income tax expense                 74,000 63,100 176,600
Current:                      
Federal                 33,700 (67,100) 5,300
State                 12,400 2,600 3,300
Foreign                 26,100 37,200 46,300
Total current income tax (benefit) expense                 72,200 (27,300) 54,900
Deferred:                      
Federal                 (63,400) (44,200) 27,700
State                 (5,400) 1,200 5,600
Foreign                 (41,300) (10,000) (6,200)
Total deferred income tax (benefit) expense                 (110,122) (53,034) 27,155
Total income tax (benefit) expense $ (14,300) $ (35,100) $ 12,200 $ (700) $ 16,100 $ (8,500) $ (75,800) $ (12,100) (37,917) (80,237) 82,024
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                 43,900 (53,000) 110,200
State income tax, net of federal benefit                 5,600 (2,300) 5,000
Valuation allowance                 (54,800) 30,000 6,300
Exclusion of tax on non-controlling interests                 (24,700) (29,300)  
Income tax credits and incentives                 (24,600) (21,200) (18,800)
Foreign tax rate differential                 (19,700) (24,800) (38,800)
Tax exempt income                 (17,600) (13,200) (1,900)
Change in uncertain tax positions                 (5,000) 6,600 (4,500)
Change in tax rates                 34,600    
Foreign residual income                 17,800 20,100 16,900
Nondeductible costs                 6,100 2,800 2,800
Nondeductible transaction costs                   2,800 2,800
Other items, net                 500 1,200 2,000
Total income tax (benefit) expense $ (14,300) $ (35,100) $ 12,200 $ (700) $ 16,100 $ (8,500) $ (75,800) $ (12,100) $ (37,917) $ (80,237) $ 82,024
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)                 4.50% 1.50% 1.60%
Valuation allowance (as a percent)                 (43.60%) (19.80%) 2.00%
Exclusion of tax on non-controlling interests (as a percent)                 (19.70%) 19.30%  
Income tax credits and incentives (as a percent)                 (19.60%) 14.00% (6.00%)
Foreign tax rate differential (as a percent)                 (15.70%) 16.40% (12.30%)
Tax exempt income (as a percent)                 (14.00%) 8.70% (0.60%)
Change in uncertain tax positions (as a percent)                 (4.00%) (4.30%) (1.40%)
Change in tax rates (as a percent)                 27.60%    
Foreign residual income (as a percent)                 14.20% (13.30%) 5.40%
Nondeductible costs (as a percent)                 4.80% (1.80%) 0.90%
Nondeductible transaction costs (as a percent)                   (1.80%) 0.90%
Other items, net (as a percent)                 0.30% (0.90%) 0.60%
Total income tax expense (as a percent)                 (30.20%) 53.00% 26.10%
Tax benefit recognized related to previously expired and subsequently extended U.S. tax incentives and credits                 $ 10,100 $ 19,400