Commercial Loans Receivables (Changes in the Estimated Allowance for Loan Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period	$ 828	$ 191
Loans charged off, net of recoveries	0	0
Balance at end of period	789	163	$ 789	$ 163
Commercial Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period			393	180
Allowance for Loan and Lease Losses, Period Increase (Decrease)	(39)	(28)	(39)	(17)
Loans charged off, net of recoveries			0	0
Balance at end of period	789	163	789	163
Commercial Loans Receivable \| Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adoption of ASU 2016-13	$ 0	$ 0	$ 435	$ 0

Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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

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