Fair Value Measurements (Assumptions for Mortgage Servicing Rights) (Details) $ in Thousands	Dec. 26, 2015 USD ($) Loans	Mar. 28, 2015 USD ($) Loans
Fair Value Disclosures [Abstract]
Number of loans serviced with MSRs | Loans	3,649	3,306
Weighted average servicing fee (basis points)	0.3035%	0.2988%
Capitalized servicing multiple	58.12%	42.10%
Capitalized servicing rate (basis points)	0.1764%	0.1258%
Serviced portfolio with MSRs	$ 418,418	$ 380,120
Mortgage servicing rights	$ 738	$ 475