Leases - Supplemental lease information (Details) $ in Thousands	12 Months Ended
	Mar. 28, 2020 USD ($)
Supplemental Lease Information
Operating cash flows from operating leases	$ 41,227
Operating cash flows from finance leases	552
Financing cash flows from finance leases	466
Cash paid for amounts included in the measurement of lease liabilities	42,245
Lease liabilities arising from new right-of-use assets-Operating leases	$ 42,420
Weighted average remaining lease term-Operating leases	6 years 4 months 24 days
Weighted average remaining lease term-Finance leases	22 years 1 month 6 days
Weighted average discount rate-Operating leases	6.20%
Weighted average discount rate-Finance leases	12.00%