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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Balance at beginning of period |  |  | $ 286,880,000 |  |  |
Other comprehensive (loss) income, net of tax | $ (302,000) | $ 330,000 | (1,019,000) | $ 1,283,000 |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0 |  |
Balance at end of period | 279,788,000 |  | 279,788,000 |  |  |
ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ (746,000) | $ 0
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Balance at beginning of period | (6,891,000) | (6,488,000) | (5,428,000) | (7,441,000) |  |
Adjusted balance at beginning of period |  |  | (6,174,000) | (7,441,000) |  |
Balance at end of period | (7,193,000) | (6,158,000) | (7,193,000) | (6,158,000) |  |
Unrealized Gain (Loss) on Short-Term Investments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Balance at beginning of period | 0 | 644,000 | 746,000 | 528,000 |  |
Adjusted balance at beginning of period |  |  | 0 | 528,000 |  |
Other comprehensive (loss) income, net of tax | 0 | 83,000 | 0 | 199,000 |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0 |  |
Balance at end of period | 0 | 727,000 | 0 | 727,000 |  |
Unrealized Gain (Loss) on Short-Term Investments [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | (746,000) | 0
Foreign Currency Translation [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Balance at beginning of period | (6,891,000) | (7,132,000) | (6,174,000) | (7,969,000) |  |
Adjusted balance at beginning of period |  |  | (6,174,000) | (7,969,000) |  |
Other comprehensive (loss) income, net of tax | (302,000) | 247,000 | (1,019,000) | 1,084,000 |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0 |  |
Balance at end of period | $ (7,193,000) | $ (6,885,000) | $ (7,193,000) | $ (6,885,000) |  |
Foreign Currency Translation [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 0 | $ 0

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