Income Taxes (Income Tax Reconciliation) (Details)	12 Months Ended
	Feb. 28, 2015	Mar. 01, 2014	Mar. 02, 2013
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rates	35.00%	35.00%	35.00%
State and local income taxes, net of federal tax benefit	1.20%	0.90%	0.90%
Tax credits - research & development	(1.10%)	(1.60%)	(2.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent	(9.90%)	0.00%	0.00%
Tax credits - other	(0.10%)	(0.20%)	(0.40%)
Manufacturing deduction	(2.30%)	(3.50%)	(2.00%)
Meals and entertainment	0.40%	0.60%	0.90%
Permanent tax adjustment for officers compensation	0.10%	0.10%	0.00%
Nondeductible acquisition costs	0.00%	0.30%	0.00%
Tax-exempt interest	0.00%	(0.20%)	(0.40%)
Tax reserve adjustments - statute expirations and benefits recognized	(0.20%)	(2.20%)	(3.00%)
Change in valuation allowance	0.10%	0.40%	0.80%
Other, net	(0.90%)	0.00%	0.00%
Income tax expense	22.30%	29.60%	29.30%