v2.4.0.6

Marketable Securities (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 26, 2011
Marketable Securities [Abstract] |  |
Schedule Of Available-for-sale Securities |
As of March 31, 2012: | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value (Net Carrying Amount)
Corporate securities – U.S................................................. | 48,011 | 33 | (19) | 48,025
U.S. Treasury securities...................................................... | 30,264 | 1 | (4) | 30,261
Agency discount notes....................................................... | 16,789 | 8 | (1) | 16,796
Commercial paper.............................................................. | 23,719 | 5 | (15) | 23,709
Total securities................................................................. | $ 118,783 | $ 47 | $ (39) | $ 118,791
As of March 26, 2011: | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value (Net Carrying Amount)
Corporate securities – U.S................................................. | 64,228 | 22 | (38) | 64,212
U.S. Treasury securities...................................................... | 35,268 | 13 | — | 35,281
Agency discount notes....................................................... | 16,588 | 5 | (2) | 16,591
Commercial paper.............................................................. | 56,130 | 23 | (7) | 56,146
Total securities................................................................. | $ 172,214 | $ 63 | $ (47) | $ 172,230
Schedule of Cost And Estimated Fair Value Of Available-for-sale Securities By Contractual Maturity |
| March 31, 2012 | March 26, 2011
| Amortized Cost | Estimated Fair Value | Amortized Cost | Estimated Fair Value
Within 1 year....................................................................... | $ 115,871 | $ 115,876 | $ 159,516 | $ 159,528
After 1 year......................................................................... | 2,912 | 2,915 | 12,698 | 12,702
| $ 118,783 | $ 118,791 | $ 172,214 | $ 172,230

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MarketableSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration