Marketable Securities (Details) - USD ($) $ in Thousands	Aug. 29, 2015	Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 34,145
Amortized Cost	64,209	$ 10,973
Gross Unrealized Gains	51	127
Gross Unrealized Losses	138	118
Estimated Market Value, Total	34,084
Available-for-sale Securities	64,122	10,982
Mutual Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,064
Gross Unrealized Losses	26
Estimated Market Value, Total	30,038
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,139	10,973
Gross Unrealized Gains	51	127
Gross Unrealized Losses	112	118
Estimated Market Value, Total	8,078	$ 10,982
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,006
Estimated Market Value, Total	$ 26,006