Fair Value Measurements (Assumptions for Mortgage Servicing Rights) (Details) $ in Thousands	Dec. 30, 2017 USD ($) Loans	Apr. 01, 2017 USD ($) Loans
Fair Value Disclosures [Abstract]
Number of loans serviced with MSRs | Loans	4,274	4,041
Weighted average servicing fee (basis points)	0.32%	0.3142%
Capitalized servicing multiple	80.81%	74.79%
Capitalized servicing rate (basis points)	0.2586%	0.235%
Serviced portfolio with MSRs	$ 507,530	$ 472,492
Mortgage servicing rights	$ 1,312	$ 1,110