Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013	Mar. 02, 2013
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 15,222
Amortized Cost, Due after one year through five years	2,950
Amortized Cost, Due after five years through 10 years	7,328
Amortized Cost, Due after 10 years through 15 years	1,250
Amortized Cost, Due beyond 15 years	65
Amortized Cost, Total	26,815
Estimated Market Value, Due within one year	15,227
Estimated Market Value, Due after one year through five years	2,956
Estimated Market Value, Due after five years through 10 years	7,006
Estimated Market Value, Due after 10 years through 15 years	1,015
Estimated Market Value, Due beyond 15 years	67
Estimated Market Value, Total	$ 26,271	$ 38,814