Profit Sharing, Employee Stock Ownership, Employee Stock Purchase and Pension Plans (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Apr. 03, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum annual profit sharing per employee (percent)		15.00%	15.00%
Employee Stock Ownership Plan, ESOP, Subsequent Employees Hired Maximm Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date	50.00%
ESOP compensation expense, maximum percent of eligible compensation (percent)	5.00%	5.00%	5.00%
ESPP maximum monthly contribution per employee (percent)			75.00%
ESPP maximum monthly contribution per employee			$ 375
Profit sharing contribution expense	1,204,000	2,616,000	2,675,000
ESOP contribution expense	1,203,000	802,000	815,000
ESPP contribution expense	289,000	262,000	648,000
vertex plan contribution expense	1,206,000	0	0
Total contribution expense	3,902,000	3,855,000	4,138,000
Maximum [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution (percent)	5.00%
Vertex [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
vertex plan contribution expense	0	175,000	0
Vertex [Member] | Maximum [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution (percent)		3.00%
vertex plan contribution expense		$ 200,000
Deferred Profit Sharing [Member] | Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution percentage of contribution for employees hired before April 1, 2012 (percent)	50.00%
Maximum annual profit sharing per employee (percent)	5.00%