Commercial Loans Receivables (Commercial Loans Receivables by Credit Quality Indicator and Year of Origination) (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Mar. 28, 2020
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	$ 40,758	$ 47,202
Fiscal 2021
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	22,708
Fiscal 2020
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	10,394
Fiscal 2019
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	3,954
Fiscal 2018
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	2,180
Fiscal 2017
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	1,522
Performing
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	40,758	47,016
Performing | Fiscal 2021
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	22,708
Performing | Fiscal 2020
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	10,394
Performing | Fiscal 2019
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	3,954
Performing | Fiscal 2018
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	2,180
Performing | Fiscal 2017
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	1,522
Watch list
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0	186
Watch list | Fiscal 2021
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Watch list | Fiscal 2020
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Watch list | Fiscal 2019
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Watch list | Fiscal 2018
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Watch list | Fiscal 2017
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Nonperforming
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0	$ 0
Nonperforming | Fiscal 2021
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Nonperforming | Fiscal 2020
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Nonperforming | Fiscal 2019
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Nonperforming | Fiscal 2018
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	0
Nonperforming | Fiscal 2017
Financing Receivable Recorded Investment [Line Items]
Commercial loans receivable	$ 0