Delinquency status of consumer loans (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Mar. 28, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans receivable	$ 87,536	$ 85,990
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans receivable	84,200	83,861
31 - 60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans receivable	834	547
61 - 90 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans receivable	178	307
91+ days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans receivable	$ 2,324	$ 1,275