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Accumulated Other Comprehensive Loss (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Beginning balance | $ 274,829,000 | $ 281,419,000 | $ 279,755,000 | $ 286,880,000 |  |
Adjusted beginning balance |  |  |  | 286,880,000 |  |
Other comprehensive income (loss), net of tax | (431,000) | (2,000) | 168,000 | (717,000) |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0 | 0 | 0 |  |
Ending balance | 281,345,000 | 282,164,000 | 281,345,000 | 282,164,000 |  |
ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 0 | $ 0
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Beginning balance | (6,288,000) | (6,889,000) | (6,887,000) | (5,428,000) |  |
Adjusted beginning balance |  |  | (6,887,000) | (6,174,000) |  |
Ending balance | (6,719,000) | (6,891,000) | (6,719,000) | (6,891,000) |  |
AOCI Attributable to Parent [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  |  | (746,000)
Unrealized Gain on Short-Term Investments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 746,000 |  |
Adjusted beginning balance |  |  | 0 | 0 |  |
Other comprehensive income (loss), net of tax | 0 | 0 | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0 | 0 | 0 |  |
Ending balance | 0 | 0 | 0 | 0 |  |
Unrealized Gain on Short-Term Investments [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | 0 | (746,000)
Foreign Currency Translation [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Beginning balance | (6,288,000) | (6,889,000) | (6,887,000) | (6,174,000) |  |
Adjusted beginning balance |  |  | (6,887,000) | (6,174,000) |  |
Other comprehensive income (loss), net of tax | (431,000) | (2,000) | 168,000 | (717,000) |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0 | 0 | 0 |  |
Ending balance | $ (6,719,000) | $ (6,891,000) | $ (6,719,000) | $ (6,891,000) |  |
Foreign Currency Translation [Member] | ASU 2016-01 [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 0 | $ 0

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