Cash And Cash Equivalents And Investments (Schedule Of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2013	Mar. 30, 2013
Schedule of Investments [Line Items]
Unrealized Loss	$ (200)
Total short-term investments, Carrying Value	126,456	123,847
Short-term Investments [Member]
Schedule of Investments [Line Items]
Total short-term investments, Amortized Cost	126,798	123,471
Unrealized Gain	108	406
Unrealized Loss	(450)	(30)
Total short-term investments, Carrying Value	126,456	123,847
Short-term Investments [Member] | Equity Mutual Funds Related To NQDCP [Member]
Schedule of Investments [Line Items]
Short-term investments, trading securities	9,685	9,673
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Investments [Line Items]
Available-for sale securities, Amortized Cost	82,590	58,524
Unrealized Gain	62	156
Unrealized Loss	(254)	(22)
Available-for-sale securities, Carrying Value	82,398	58,658
Short-term Investments [Member] | Corporate Bonds [Member]
Schedule of Investments [Line Items]
Available-for sale securities, Amortized Cost	26,547	25,667
Unrealized Gain	43	161
Unrealized Loss	(196)	(3)
Available-for-sale securities, Carrying Value	26,394	25,825
Short-term Investments [Member] | Government Agency Bonds [Member]
Schedule of Investments [Line Items]
Available-for sale securities, Amortized Cost		16,106
Unrealized Gain		82
Unrealized Loss		(1)
Available-for-sale securities, Carrying Value		16,187
Short-term Investments [Member] | Certificates Of Deposits [Member]
Schedule of Investments [Line Items]
Available-for sale securities, Amortized Cost	6,478	7,758
Unrealized Gain	3	5
Unrealized Loss		(4)
Available-for-sale securities, Carrying Value	6,481	7,759
Short-term Investments [Member] | Commercial Paper [Member]
Schedule of Investments [Line Items]
Available-for sale securities, Amortized Cost	1,498	5,743
Unrealized Gain		2
Available-for-sale securities, Carrying Value	1,498	5,745
Long-term Investments [Member]
Schedule of Investments [Line Items]
Available-for sale securities, Amortized Cost	2,100	15,050
Unrealized Loss	(200)	(1,250)
Available-for-sale securities, Carrying Value	$ 1,900	$ 13,800