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Accumulated other comprehensive loss 2 of 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassification | $ (29,681) |  |
Amounts reclassified from other comprehensive loss to net income | (1,617) |  |
Unrealized Investment Gain |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net unrealized investment gain (loss) at beginning of year | 0 | $ 888 | $ 699
Other comprehensive income (loss) before reclassification | 0 | 0 | 189
Amounts reclassified from other comprehensive loss to net income | 0 | 0 | 0
Net change in unrealized gain (loss) on investments | 0 | (888) | 189
Net unrealized investment gain at end of year | 0 | 0 | 888
Accounting Standards Update 2016-01 [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
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 |  | $ 888 | $ 0

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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