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Provision for Taxes (Earnings before taxes and provision for taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Pretax earnings:      
U.S. $ 628,901 $ 609,589 $ 745,194
Non-U.S. 8,712 18,769 23,717
Total pretax earnings 637,613 628,358 768,911
Current provision (benefit)      
Federal 21,780 38,723 118,974
State 6,471 10,818 15,988
Non-U.S. 1,412 3,334 3,303
Current provision (benefit), total 29,663 52,875 138,265
Deferred provision (benefit)      
Federal (199,415) 160,527 125,950
State 15,479 15,210 12,561
Non-U.S. 1,303 1,322 3,134
Deferred provision (benefit), total (182,633) 177,059 141,645
Provision for income tax expense (152,970) 229,934 279,910
Income taxes paid (net of income tax refunds) $ 68,671 $ 36,880 $ 141,901