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Stock-based compensation - Stock Options (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 01, 2018	Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018	Apr. 01, 2017
Restricted Stock Awards
Stock-based compensation
Average remaining service period for recognition of unrecognized compensation cost		1 year 3 months 18 days
Nonqualified stock options
Stock-based compensation
Stock-based compensation expense (in dollars)		$ 949	$ 1,319	$ 1,520
Unrecognized compensation cost (in dollars)		$ 448
Average remaining service period for recognition of unrecognized compensation cost		7 months 6 days
Intrinsic value		$ 0	0	0
Fair value of shares vested		$ 1,167	$ 1,507	$ 1,613
Amended and Restated 2013 Incentive Award Plan \| Nonqualified stock options
Stock-based compensation
Vesting period				3 years	3 years
Awards granted (in shares)		0	0	343,352
Amended and Restated 2013 Incentive Award Plan \| Time-based restricted shares granted on June 1, 2018
Stock-based compensation
Vesting period	3 years