Commercial Loans Receivables and Allowance for Loan Loss (Concentrations of Inventory Finance Receivables) (Details)	Mar. 31, 2018	Apr. 01, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk on Financing Receivables Percentage	10.00%	10.00%
Commercial Loans Receivable Principal Balance Concentration	37.40%	22.80%
INDIANA
Geographic Concentration of Commercial Loans Receivables in Key States
Commercial loan receivables concentrations		10.70%
Texas [Member]
Geographic Concentration of Commercial Loans Receivables in Key States
Commercial loan receivables concentrations		11.00%
CALIFORNIA
Geographic Concentration of Commercial Loans Receivables in Key States
Commercial loan receivables concentrations	14.40%	11.00%
Arizona [Member]
Geographic Concentration of Commercial Loans Receivables in Key States
Commercial loan receivables concentrations	16.70%	21.30%
OREGON
Geographic Concentration of Commercial Loans Receivables in Key States
Commercial loan receivables concentrations	14.70%	15.70%