Commercial Loans Receivables and Allowance for Loan Loss (Concentrations of Commercial Loans Receivables) (Details)	Dec. 29, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans Receivable Principal Balance Concentration	16.70%	37.40%
ARIZONA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans Receivables Geographic Concentration Percentage	14.20%	16.70%
CALIFORNIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans Receivables Geographic Concentration Percentage	13.30%	14.40%
TEXAS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans Receivables Geographic Concentration Percentage	13.10%	9.00%
OREGON
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans Receivables Geographic Concentration Percentage	11.00%	14.70%