Leases - Lease cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Lease cost
Total finance lease cost	$ 416	$ 367
Total lease cost	12,024	11,458
Cost of goods sold
Lease cost
Amortization of right-of-use assets	229	179
Operating lease cost	10,652	9,528
Sublease income	(156)
Cost of goods sold | Previously Reported
Lease cost
Operating lease cost		9,094
Selling, general and administrative expenses
Lease cost
Operating lease cost	234	433
Short-term lease cost	459	566
Variable lease cost	419	564
Selling, general and administrative expenses | Previously Reported
Lease cost
Operating lease cost		867
Interest expense
Lease cost
Interest on lease liabilities	$ 187	$ 188