Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Mar. 01, 2014
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 322
Amortized Cost, Due after one year through five years	2,835
Amortized Cost, Due after five years through 10 years	6,566
Amortized Cost, Due after 10 years through 15 years	1,250
Amortized Cost, Total	10,973	11,719
Estimated Market Value, Due within one year	327
Estimated Market Value, Due after one year through five years	2,848
Estimated Market Value, Due after five years through 10 years	6,668
Estimated Market Value, Due after 10 years through 15 years	1,139
Estimated Fair Value	$ 10,982	$ 11,477