Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 02, 2013	Mar. 03, 2012
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 26,010
Amortized Cost, Due after one year through five years	4,122
Amortized Cost, Due after five years through 10 years	7,174
Amortized Cost, Due after 10 years through 15 years	1,530
Amortized Cost, Due beyond 15 years	91
Amortized Cost, Total	38,927
Estimated Market Value, Due within one year	26,007
Estimated Market Value, Due after one year through five years	4,160
Estimated Market Value, Due after five years through 10 years	7,221
Estimated Market Value, Due after 10 years through 15 years	1,332
Estimated Market Value, Due beyond 15 years	94
Estimated Fair Value	$ 38,814	$ 19,600