Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Apr. 03, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 17,126	$ 22,685	$ 20,314
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale investments	12	(4)	(63)
Unrealized gain (loss) on post-retirement liability	5	26	(119)
Total other comprehensive income (loss)	17	22	(182)
Other comprehensive income, net of tax	$ 17,143	$ 22,707	$ 20,132