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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Provision for (benefit from) income taxes | $ (6,203) | $ (4,087) | $ (986) | $ 1,349 |
Effective income tax rates | 8.80% | 6.80% | 1.00% | (1.50%) |
Excess tax benefit | $ 700 | $ 1,100 | $ 9,000 | $ 11,000 |
Tax benefit from reversal of uncertain tax position | 500 | $ 700 | 1,400 | $ 1,300 |
Unrecognized tax benefits | 70,400 |  | 70,400 |  | $ 69,100
Accrued interest and penalties related to uncertain tax positions | 2,500 |  | 2,500 |  | 2,300
Expected decrease in uncertain tax positions | 3,300 |  | 3,300 |  |
Non-current income tax payable |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Unrecognized tax benefits | $ 34,500 |  | $ 34,500 |  | $ 35,000

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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