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Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Current |  |  |  |
Federal |  | $ 80,339 | $ 2,184 | $ 11,971
State |  | 3,437 | 1,576 | 2,443
Foreign |  | 14,388 | 8,039 | 12,039
Total |  | 98,164 | 11,799 | 26,453
Deferred |  |  |  |
Federal |  | 12,007 | (20,287) | 7,887
State |  | 391 | (3,446) | 1,113
Foreign |  | (4,260) | (762) | (833)
Total |  | 8,138 | (24,495) | 8,167
Income taxes |  |  |  |
Income tax expense (benefit) |  | 106,302 | (12,696) | 34,620
Actual income taxes differed from that obtained by applying the statutory federal income tax rate to income before income taxes |  |  |  |
Computed expected income taxes |  | 69,556 | (2,445) | 54,910
State income taxes, net of federal income tax benefit |  | 9,044 | (1,403) | 1,298
Foreign rate differential |  | (37,090) | (8,062) | (28,233)
Unrecognized tax benefits |  | 1,301 | 2,691 | 3,670
Income tax expense on diminution of operations and nondeductible goodwill |  | 0 | 3,921 | 1,352
Foreign income withholding tax expense |  | 262 | 432 | 0
Nontaxable income |  | (7,006) | (5,055) | 0
US tax on deemed repatriated foreign earnings | $ 59,114 | 57,138 | 0 | 0
Re-measurement of deferred taxes |  | 14,395 | 0 | 0
Statutory foreign income tax expense (benefit) |  | 59 | (2,504) | (477)
Other |  | (1,357) | (271) | 2,100
Income tax expense (benefit) |  | $ 106,302 | $ (12,696) | $ 34,620

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