Commercial Loans Receivables and Allowance for Loan Loss (Changes in the Estimated Allowance for Loan Loss) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Receivables [Abstract]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 22,000	$ 20,000	$ 93,000	$ 32,000
Changes in the Allowance for Loan Losses on Commercial Loans Receivables
Balance at beginning of period	113,000	222,000	42,000	210,000
Loans charged off, net of recoveries	0	0	0	0
Balance at end of period	$ 135,000	$ 242,000	$ 135,000	$ 242,000