Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 01, 2012	Mar. 03, 2012
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 25,090
Amortized Cost, Due after one year through five years	4,423
Amortized Cost, Due after five years through 10 years	2,611
Amortized Cost, Due after 10 years through 15 years	2,137
Amortized Cost, Due beyond 15 years	284
Amortized Cost, Total	34,545
Estimated Market Value, Due within one year	25,091
Estimated Market Value, Due after one year through five years	4,502
Estimated Market Value, Due after five years through 10 years	2,684
Estimated Market Value, Due after 10 years through 15 years	1,904
Estimated Market Value, Due beyond 15 years	309
Estimated Market Value, Total	$ 34,490	$ 19,600