Leases - Supplemental lease information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Supplemental Lease Information
Operating cash flows from operating leases	$ 10,920	$ 10,026
Operating cash flows from finance leases	1	188
Financing cash flows from finance leases	619	146
Cash paid for amounts included in the measurement of lease liabilities	11,540	10,360
Lease liabilities arising from new right-of-use assets-Operating leases	$ 2,536	$ 5,594
Weighted average remaining lease term (in years)-Operating leases	6 years 3 months 18 days	8 years
Weighted average remaining lease term (in years)-Finance leases	21 years 4 months 24 days	11 years 6 months
Weighted average discount rate-Operating leases	6.30%	6.40%
Weighted average discount rate-Finance leases	12.10%	10.30%