Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Mar. 02, 2013
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 2,688
Amortized Cost, Due after one year through five years	2,720
Amortized Cost, Due after five years through 10 years	7,451
Amortized Cost, Due after 10 years through 15 years	1,250
Amortized Cost, Due beyond 15 years	66
Amortized Cost, Total	14,175
Estimated Market Value, Due within one year	2,689
Estimated Market Value, Due after one year through five years	2,743
Estimated Market Value, Due after five years through 10 years	7,272
Estimated Market Value, Due after 10 years through 15 years	1,021
Estimated Market Value, Due beyond 15 years	67
Estimated Market Value, Total	$ 13,792	$ 38,814