Marketable Securities (Details) - USD ($) $ in Thousands	May. 30, 2015	Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 15,060
Amortized Cost	45,071	$ 10,973
Gross Unrealized Gains	71	127
Gross Unrealized Losses	160	118
Estimated Market Value, Total	14,984
Available-for-sale Securities	44,982	10,982
Mutual Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,011
Gross Unrealized Losses	13
Estimated Market Value, Total	29,998
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,060	10,973
Gross Unrealized Gains	71	127
Gross Unrealized Losses	147	118
Estimated Market Value, Total	9,984	$ 10,982
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000
Estimated Market Value, Total	$ 5,000