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Accumulated other comprehensive loss 2 of 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassification | $ 29,030 | $ (29,681) |
Amounts reclassified from other comprehensive loss to net income | 25,334 | (1,617) |
Unrealized Investment Gain |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net unrealized investment gain (loss) at beginning of year | 0 | 0 | $ 888
Other comprehensive income (loss) before reclassification | 0 | 0 | 0
Amounts reclassified from other comprehensive loss to net income | 0 | 0 | 0
Net change in unrealized gain (loss) on investments | 0 | 0 | (888)
Net unrealized investment gain at end of year | 0 | 0 | 0
Accounting Standards Update 2016-01 [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from other comprehensive loss to net income |  |  | (888)
Net unrealized investment gain at end of year | $ 0 |  |
Accounting Standards Update 2016-01 [Member] | Unrealized Investment Gain |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from other comprehensive loss to net income |  | $ 0 | $ 888

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