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Income Taxes - Tax (Benefit) Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Taxes                      
Income (loss) from domestic operations before income tax expense                 $ 317,900 $ 322,200 $ 51,600
Income (loss) from foreign operations before income tax expense                 (140,400) 107,000 74,000
Current:                      
Federal                 (122,400) 10,300 33,700
State                 19,000 17,900 12,400
Foreign                 47,100 29,300 26,100
Total current income tax expense                 (56,300) 57,500 72,200
Deferred:                      
Federal                 14,500 (8,300) (63,400)
State                 39,000 10,400 (5,400)
Foreign                 (16,800) (51,900) (41,300)
Total deferred income tax expense (benefit)                 36,746 (49,856) (110,122)
Total income tax (benefit) expense $ 18,700 $ 33,100 $ (24,400) $ (47,100) $ 6,200 $ 12,100 $ (35,400) $ 24,800 $ (19,643) $ 7,706 $ (37,917)