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Income Taxes - Federal Rate Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Rate reconciliation                      
Tax at federal statutory rate                 $ (38,700) $ 43,500 $ 150,300
State income tax, net of federal benefit                 9,000 17,800 24,300
Impairment of goodwill, nondeductible for tax                 82,700 33,900  
Foreign residual income                 28,900 10,300  
Foreign residual income                     (9,200)
Nondeductible costs                 9,200 3,500 5,800
Change in uncertain tax positions                 6,000 (31,400) 9,500
Return to provision, primarily foreign tax credits                 3,700 (18,500)  
Income tax credits and incentives                 (47,600) (37,200) (56,800)
Valuation allowance                 (20,300) 58,700 (51,200)
Exclusion of tax on non-controlling interests                 (16,300) (14,900) (28,200)
Foreign tax rate differential                 (4,800) (1,600) (19,200)
Audit settlement                 (4,600) (27,700)  
Tax exempt income                 (3,900) (7,400) (17,900)
Impact of changes in tax law                 (1,500) (47,800)  
Other items, net                 (1,900) (800) 300
Total income tax expense (benefit) $ (24,000) $ 36,600 $ 20,900 $ (33,600) $ 18,700 $ 33,100 $ (24,400) $ (47,100) $ (130) $ (19,643) $ 7,706
Major elements contributing to the difference between the U.S. federal statutory rate of 24.5% for fiscal year 2018 and 35% for fiscal years ended 2017 and 2016 and the effective tax rate                      
Federal statutory rate (as a percent)                 21.00% 24.50% 35.00%
State income tax, net of federal benefit (as a percent)                 (4.90%) 10.00% 5.70%
Impairment of goodwill, nondeductible for tax                 (44.90%) 19.10%  
Foreign residual income (as a percent)                 (15.70%)   (2.10%)
Foreign residual income (as a percent)                   (5.80%)  
Nondeductible costs (as a percent)                 (5.00%) 1.90% 1.40%
Change in uncertain tax positions (as a percent)                 (3.30%) (17.70%) 2.20%
Return to provision, primarily foreign tax credits (as a percent)                 (2.00%) (10.40%)  
Income tax credits and incentive (as a percent)                 25.80% (21.00%) (13.20%)
Valuation allowance (as a percent)                 11.00% 33.10% (11.90%)
Exclusion of tax on non-controlling interests (as a percent)                 8.90% (8.40%) (6.60%)
Foreign tax rate differential (as a percent)                 2.60% (0.90%) (4.50%)
Audit settlement (as a percent)                 2.50% (15.60%)  
Tax exempt income (as a percent)                 2.10% (4.20%) (4.20%)
Change in tax rates (as a percent)                 0.80% (26.90%)  
Other items, net (as a percent)                 1.20% (0.40%)  
Total income tax expense (as a percent)                 0.10% (11.10%) 1.80%