Description of Business and Summary of Significant Accounting Policies - Losses and LAE, Gross of Reinsurance (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2021 USD ($)
Description of Business and Summary of Significant Accounting Policies
Losses and LAE reserve at April 5	$ 84,366
Reinsurance recoverables on losses and LAE	(82,898)
Losses and LAE reserve, net of reinsurance recoverables at April 5	1,468
Net incurred losses and LAE during the current year	15,744
Net claim and LAE payments during the current year	(10,106)
Reserve for losses and LAE, net of reinsurance recoverables, at end of year	7,106
Reinsurance recoverables on losses and LAE	80,631
Losses and LAE reserve at September 30	$ 87,737