Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 04, 2017	Feb. 27, 2016
Cash equivalents
Total cash equivalents	$ 9,923	$ 52,973
Available for sale securities
Total available for sale securities		30,173
Long-term securities
Total assets at fair value	19,512	95,665
Money market funds
Cash equivalents
Total cash equivalents	4,423	23,199
Commercial paper
Cash equivalents
Total cash equivalents	5,500	29,774
Mutual fund
Available for sale securities
Total available for sale securities		30,123
Municipal bonds
Available for sale securities
Total available for sale securities	548	50
Long-term securities
Total long-term securities	9,041	12,519
Quoted Prices in Active Markets (Level 1)
Cash equivalents
Total cash equivalents	4,423	23,199
Available for sale securities
Total available for sale securities		30,123
Long-term securities
Total assets at fair value	4,423	53,322
Quoted Prices in Active Markets (Level 1) | Money market funds
Cash equivalents
Total cash equivalents	4,423	23,199
Quoted Prices in Active Markets (Level 1) | Commercial paper
Cash equivalents
Total cash equivalents	0	0
Quoted Prices in Active Markets (Level 1) | Mutual fund
Available for sale securities
Total available for sale securities		30,123
Quoted Prices in Active Markets (Level 1) | Municipal bonds
Available for sale securities
Total available for sale securities	0	0
Long-term securities
Total long-term securities	0	0
Other Observable Inputs (Level 2)
Cash equivalents
Total cash equivalents	5,500	29,774
Available for sale securities
Total available for sale securities		50
Long-term securities
Total assets at fair value	15,089	42,343
Other Observable Inputs (Level 2) | Money market funds
Cash equivalents
Total cash equivalents	0	0
Other Observable Inputs (Level 2) | Commercial paper
Cash equivalents
Total cash equivalents	5,500	29,774
Other Observable Inputs (Level 2) | Mutual fund
Available for sale securities
Total available for sale securities		0
Other Observable Inputs (Level 2) | Municipal bonds
Available for sale securities
Total available for sale securities	548	50
Long-term securities
Total long-term securities	$ 9,041	$ 12,519