CASH AND CASH EQUIVALENTS AND INVESTMENTS (Schedule Of Investments) (Details) (USD $)	Mar. 30, 2013	Mar. 31, 2012
Unrealized Loss	$ (1,250,000)
Short-Term Investments [Member]
Available-for-sale securities, Amortized Cost	123,471,000	111,063,000
Unrealized Gain	406,000	144,000
Unrealized Loss	(30,000)	(70,000)
Available-for-sale securities, Carrying Value	123,847,000	111,137,000
Short-Term Investments [Member] | Equity Mutual Funds Related to NQDCP [Member]
Trading securities	9,673,000	8,650,000
Short-Term Investments [Member] | Municipal Bonds [Member]
Available-for-sale securities, Amortized Cost	58,524,000	32,250,000
Unrealized Gain	156,000	39,000
Unrealized Loss	(22,000)	(21,000)
Available-for-sale securities, Carrying Value	58,658,000	32,268,000
Short-Term Investments [Member] | Corporate Bonds [Member]
Available-for-sale securities, Amortized Cost	25,667,000	36,912,000
Unrealized Gain	161,000	68,000
Unrealized Loss	(3,000)	(33,000)
Available-for-sale securities, Carrying Value	25,825,000	36,947,000
Short-Term Investments [Member] | Government Agency Bonds [Member]
Available-for-sale securities, Amortized Cost	16,106,000	25,984,000
Unrealized Gain	82,000	33,000
Unrealized Loss	(1,000)	(7,000)
Available-for-sale securities, Carrying Value	16,187,000	26,010,000
Short-Term Investments [Member] | Certificates Of Deposit [Member]
Available-for-sale securities, Amortized Cost	7,758,000	7,267,000
Unrealized Gain	5,000	4,000
Unrealized Loss	(4,000)	(9,000)
Available-for-sale securities, Carrying Value	7,759,000	7,262,000
Short-Term Investments [Member] | Commercial Papers [Member]
Available-for-sale securities, Amortized Cost	5,743,000
Unrealized Gain	2,000
Available-for-sale securities, Carrying Value	5,745,000
Long-Term Investments In ARS [Member]
Available-for-sale securities, Amortized Cost	15,050,000	28,050,000
Unrealized Loss	(1,250,000)	(2,150,000)
Available-for-sale securities, Carrying Value	$ 13,800,000	$ 25,900,000