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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Contingency [Line Items] |  |  |
Provisional transition tax |  | $ 59,114,000 |
Adjusted transition tax | $ 57,895,000 | 57,895,000 |
Expected future taxable income to realize deferred tax assets | 118,447,000 |  |
Deferred tax assets OCL period increase (decrease) | (572,000) |  |
Operating loss and tax credit carryforwards | 843,000 | 974,000 |
US tax on deemed repatriated foreign earnings | 6,348,000 |  |
Dividend from foreign subsidiary | (130,000,000) | (250,000,000) | $ (13,692,000)
Withholding tax | 0 |  |
Undistributed earnings of foreign subsidiaries | 388,535,000 |  |
Non US subsidiary cash and cash equivalents | 214,876,000 |  |
Undistributed earnings from foreign subsidiaries not subject to transition tax | 15,193,000 |  |
Income tax penalties and interest accrued | 2,456,000 | 3,224,000 |
Income tax penalties and interest expense | (110,000) | 369,000 | $ 1,148,000
(Decrease) in unrecognized tax benefit expected to settle in next twelve months | 3,272,000 |  |
State Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Provisional transition tax |  | $ 1,976,000 |
Income Tax Expense (Benefit) |  |  |
Income Tax Contingency [Line Items] |  |  |
(Decrease) in unrecognized tax benefit expected to settle in next twelve months | 2,332,000 |  |
Interest Expense |  |  |
Income Tax Contingency [Line Items] |  |  |
(Decrease) in unrecognized tax benefit expected to settle in next twelve months | $ 940,000 |  |

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