Commercial Loans Receivables (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Jun. 29, 2019
Receivables [Abstract]
Allowance for loan loss	$ 789	$ 828		$ 163	$ 191
Commercial loans 90 days past due still accruing interest	$ 0
Due days for loans on nonaccrual status when interest is past due and remains unpaid	90 days
Percentage concentration of commercial loans receivables	10.00%		10.00%