Marketable Securities (Details 2) (USD $) In Thousands, unless otherwise specified	May 31, 2014	Mar. 01, 2014
Schedule of amortized cost and estimated fair values of investments by contractual maturity
Amortized Cost, Due within one year	$ 560
Amortized Cost, Due after one year through five years	2,398
Amortized Cost, Due after five years through 10 years	6,690
Amortized Cost, Due after 10 years through 15 years	1,250
Amortized Cost, Due beyond 15 years	15
Amortized Cost, Total	10,913
Estimated Market Value, Due within one year	564
Estimated Market Value, Due after one year through five years	2,435
Estimated Market Value, Due after five years through 10 years	6,703
Estimated Market Value, Due after 10 years through 15 years	1,081
Estimated Market Value, Due beyond 15 years	15
Estimated Market Value, Total	$ 10,798	$ 11,477