Postretirement Benefit Plans (Narrative) (Details) (USD $)	9 Months Ended	12 Months Ended			15 Months Ended
	Dec. 28, 2013	Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013	Mar. 28, 2015
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.20%			3.20%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 1,400,000
Other long-term obligations		8,786,000	4,010,000		8,786,000
Maximum employer contribution matching percentage		50.00%	50.00%
Percentage of employees' annual contribution that qualifies for employer contribution matching	6.00%				8.00%
Defined Contribution Plan, Cost Recognized		2,500,000	1,800,000	1,500,000
Pension Plan [Member]
Other long-term obligations		600,000			600,000
Defined Contribution Plan, Cost Recognized		$ 1,650,000