Note 6 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Lease cost:
Amortization of right of use asset	$ 1,145	$ 1,040	$ 2,331	$ 2,107
Interest on lease liabilities	278	344	572	712
Finance lease cost	1,423	1,384	2,903	2,819
Operating lease cost	6,239	7,789	12,646	15,689
Total lease cost	$ 7,662	$ 9,173	15,549	18,508
Operating cash flows from finance leases			572	712
Operating cash flows from operating leases			15,211	18,390
Financing cash flows from finance leases			3,072	3,252
Payments for Amounts Included in the Measurement of Lease Liabilities, Total			18,855	22,354
Right-of-use assets obtained in exchange for new finance lease liabilities			1,122	1,471
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 2,559	$ 5,574
Financing leases (Year)	4 years 10 months 24 days	5 years 7 months 6 days	4 years 10 months 24 days	5 years 7 months 6 days
Operating leases, lease term (Year)	3 years 7 months 6 days	3 years 10 months 24 days	3 years 7 months 6 days	3 years 10 months 24 days
Financing leases	4.10%	4.20%	4.10%	4.20%
Operating leases, discount rate	4.40%	4.60%	4.40%	4.60%