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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