Marketable Securities (Summary Of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 02, 2013	Mar. 03, 2013
Schedule of Available-for-sale Securities [Line Items]
Unamortized Cost Basis	$ 90,243	$ 89,152
Gross Unrealized Gains	88	58
Gross Unrealized Losses	96	111
U.S. Treasury And Other Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unamortized Cost Basis	72,501	48,293
Gross Unrealized Gains	76	47
Gross Unrealized Losses	86	48
U.S. Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unamortized Cost Basis	17,742	40,859
Gross Unrealized Gains	12	11
Gross Unrealized Losses	$ 10	$ 63