Commercial Loans Receivables and Allowance for Loan Loss (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Receivables [Abstract]
Allowance for loan losses	$ 393	$ 180	$ 42
Due days for loans accounted for on a non-accrual basis and accruing loans with principal payments past	90 days or more
Due days for loans on nonaccrual status when interest is past due and remains unpaid	90 days or more

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant