Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 01, 2012	Mar. 03, 2012
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 25,155
Amortized Cost, Due after one year through five years	3,983
Amortized Cost, Due after five years through 10 years	4,781
Amortized Cost, Due after 10 years through 15 years	1,530
Amortized Cost, Due beyond 15 years	117
Amortized Cost, Total	35,566
Estimated Market Value, Due within one year	25,154
Estimated Market Value, Due after one year through five years	4,015
Estimated Market Value, Due after five years through 10 years	4,882
Estimated Market Value, Due after 10 years through 15 years	1,338
Estimated Market Value, Due beyond 15 years	121
Estimated Market Value, Total	$ 35,510	$ 19,600