Fair Value Measurements (Details) - USD ($) $ in Thousands	Feb. 27, 2016	Feb. 28, 2015
Cash equivalents
Total cash equivalents	$ 52,973
Available for sale securities
Total available for sale securities	30,173
Long-term securities
Total assets at fair value	95,665	$ 45,673
Money market funds
Cash equivalents
Total cash equivalents	23,199	34,386
Commercial paper
Cash equivalents
Total cash equivalents	29,774
Mutual fund
Available for sale securities
Total available for sale securities	30,123
Long-term securities
Total long-term securities		305
Municipal bonds
Available for sale securities
Total available for sale securities	50	327
Long-term securities
Total long-term securities	12,519	10,655
Quoted Prices in Active Markets (Level 1)
Cash equivalents
Total cash equivalents	23,199
Available for sale securities
Total available for sale securities	30,123
Long-term securities
Total assets at fair value	53,322	34,691
Quoted Prices in Active Markets (Level 1) | Money market funds
Cash equivalents
Total cash equivalents	23,199	34,386
Quoted Prices in Active Markets (Level 1) | Commercial paper
Cash equivalents
Total cash equivalents	0
Quoted Prices in Active Markets (Level 1) | Mutual fund
Available for sale securities
Total available for sale securities	30,123
Long-term securities
Total long-term securities		305
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	29,774
Available for sale securities
Total available for sale securities	50
Long-term securities
Total assets at fair value	42,343	10,982
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	29,774
Other Observable Inputs (Level 2) | Mutual fund
Available for sale securities
Total available for sale securities	0
Long-term securities
Total long-term securities		0
Other Observable Inputs (Level 2) | Municipal bonds
Available for sale securities
Total available for sale securities	50	327
Long-term securities
Total long-term securities	$ 12,519	$ 10,655