Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Reinsurance Effect on Premiums Written and Earned
Direct premiums Written	$ 3,820	$ 3,628	$ 8,361	$ 7,994
Assumed premiums - nonaffiliate Written	6,280	6,210	13,214	12,470
Ceded premiums - nonaffiliate Written	(3,135)	(4,309)	(5,982)	(7,257)
Net premiums Written	6,965	5,529	15,593	13,207
Direct premiums Earned	4,249	4,137	8,460	8,287
Assumed premiums - nonaffiliate Earned	6,350	6,326	12,584	12,593
Ceded premiums - nonaffiliate Earned	(3,135)	(4,309)	(5,982)	(7,257)
Net premiums Earned	$ 7,464	$ 6,154	$ 15,062	$ 13,623