Fair Value Of Financial Instruments (Tables)

6 Months Ended

12 Months Ended

Sep. 24, 2011

Mar. 26, 2011

Fair Value Of Financial Instruments [Abstract]

Schedule Of Carrying Amount And Fair Value Of Cash And Financial Instruments

	September 24, 2011		March 26, 2011
	Carrying Amount	Fair Value	Carrying Amount	Fair Value
Cash	$            5,066	$          5,066	$            9,626	$            9,626
Cash equivalents	34,202	34,202	27,413	27,413
Restricted investments	2,898	2,898	5,786	5,786
Marketable securities	100,130	100,130	159,528	159,528
Long-term marketable securities	8,703	8,703	12,702	12,702
	$        150,999	$       150,999	$        215,055	$        215,055

Schedule Of Available-For-Sale Securities

	Amortized Cost	Gross Unrealized Gains	Gross Unrealized Losses	Estimated Fair Value (Net Carrying Amount)
Corporate debt securities	$         55,562	$                  4	$              (116)	$                 55,450
Money-market funds	16,545	-	-	16,545
U.S. Treasury securities	22,076	1	(5)	22,072
Agency discount notes	16,382	10	(1)	16,391
Commercial paper	35,482	4	(11)	35,475
Total securities	$       146,047	$                19	$              (133)	$               145,933

	Amortized Cost	Gross Unrealized Gains	Gross Unrealized Losses	Estimated Fair Value (Net Carrying Amount)
Corporate debt securities	$          64,227	$                 23	$                 (38)	$                  64,212
Money-market funds	17,700	-	-	17,700
U.S. Treasury securities	45,768	13	-	45,781
Agency discount notes	16,588	5	(2)	16,591
Commercial paper	61,128	24	(7)	61,145
Total securities	$        205,411	$                 65	$                 (47)	$                205,429

Schedule Of Fair Value Of Financial Assets

Description	Quoted Prices in Active Markets for Identical  Assets  Level 1	Significant Other Observable Inputs   Level 2	Significant Unobservable  Inputs   Level 3	Total
Available-for-sale securities
Corporate debt securities	$                  -	$         55,450	$                  -	$         55,450
Money-market funds	16,545	-	-	16,545
U.S. Treasury securities	22,072	-	-	22,072
Agency discount notes	-	16,391	-	16,391
Commercial paper	-	35,475	-	35,475
	$           38,617	$       107,316	$                  -	$       145,933

Description	Quoted Prices in Active Markets for Identical    Assets     Level 1	Significant Other Observable     Inputs      Level 2	Significant Unobservable        Inputs         Level 3	Total
Available-for-sale securities
Corporate debt securities	$                   -	$          64,212	$                  -	$          64,212
Money-market funds	17,700	-	-	17,700
U.S. Treasury securities	45,781	-	-	45,781
Agency discount notes	-	16,591	-	16,591
Commercial paper	-	61,145	-	61,145
	$           63,481	$        141,948	$                  -	$        205,429