Stock Option and Stock Award Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 01, 2014	Mar. 02, 2013	Mar. 03, 2012	Mar. 01, 2014 Maximum	Mar. 01, 2014 Stock options	Mar. 02, 2013 Stock options	Mar. 03, 2012 Stock options	Mar. 01, 2014 Restricted stock	Mar. 02, 2013 Restricted stock	Mar. 03, 2012 Restricted stock	Feb. 26, 2011 Restricted stock Year one Non-employee director	Feb. 26, 2011 Restricted stock Year two Non-employee director	Feb. 26, 2011 Restricted stock Year three Non-employee director	Mar. 01, 2014 Restricted stock Maximum	Mar. 01, 2014 1999 Plan	Mar. 01, 2014 2000 Plan	Mar. 01, 2014 2001 Plan	Mar. 01, 2014 2004 Omnibus Equity Plan	Mar. 01, 2014 2006 Omnibus Equity Plan	Mar. 01, 2014 2010 Omnibus Equity Plan	Mar. 01, 2014 2012 Omnibus Equity Plan
Stock options and stock award Plans
Stock-based compensation costs	$ 16,194	$ 17,717	$ 15,861
Shares of common stock authorized under stock-based compensation plans	62,103														10,000		20,000	20,000
Shares of common stock reserved for the granting of stock options and other incentive awards																22,000
Shares of common stock available for grant																			50,000	35,000	28,500
Term of options				10 years
Fair value assumptions
Expected stock price volatility (as a percent)					85.00%	85.00%	79.00%
Expected dividend yield (as a percent)					0.00%	0.00%	0.00%
Risk-free interest rate (as a percent)					1.45%	0.71%	1.45%
Expected option life					5 years 6 months	5 years 6 months	5 years 6 months
Additional General Disclosures
Weighted average fair value of options granted (in dollars per share)					$ 1.91	$ 0.91	$ 0.82
Cash received from stock option exercises					33,217	1,646	914
Income tax benefit from stock options					23,660	0	0
Total intrinsic value of options exercised					80,598	714	255
Vesting period					4 years									3 years
Vesting percentage											80.00%	10.00%	10.00%
Total fair value of awards vested during the period								5,098	4,623	3,724
Shares
Outstanding at the beginning of the period (in shares)					81,000	73,798	74,298
Granted (in shares)					4,828	12,020	23,200
Exercised (in shares)					(26,873)	(1,535)	(896)
Cancelled (in shares)					(2,989)	(3,283)	(22,804)
Outstanding at the end of the period (in shares)					55,966	81,000	73,798
Vested or expected to vest at the end of the period (in shares)					51,761
Exercisable at the end of the period (in shares)					29,881
Weighted Average Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)					$ 1.48	$ 1.52	$ 2.47
Granted (in dollars per share)					$ 2.76	$ 1.32	$ 1.19
Exercised (in dollars per share)					$ 1.24	$ 1.06	$ 1.02
Cancelled (in dollars per share)					$ 2.46	$ 2.08	$ 4.31
Outstanding at the end of the period (in dollars per share)					$ 1.65	$ 1.48	$ 1.52
Vested or expected to vest at the end of the period (in dollars per share)					$ 1.67
Exercisable at the end of the period (in dollars per share)					$ 1.77
Weighted Average Remaining Contractual Term
Outstanding at the end of the period					6 years 5 months 23 days
Vested or expected to vest at the end of the period					6 years 4 months 17 days
Exercisable at the end of the period					5 years 3 months 7 days
Aggregate Intrinsic Value
Outstanding at the end of the period					276,320
Vested or expected to vest at the end of the period					254,692
Exercisable at the end of the period					143,971
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Total unrecognized pre-tax compensation costs, net of forfeitures					$ 15,251			$ 9,155
Weighted-average period over which remaining share-based cost is expected to be recognized					2 years 3 months 25 days			1 year 9 months 25 days
Shares
Outstanding at the beginning of the period (in shares)								12,677	11,506	7,078
Granted (in shares)								2,743	5,450	8,525
Vested (in shares)								(4,152)	(3,917)	(3,366)
Cancelled (in shares)								(1,212)	(362)	(731)
Outstanding at the end of the period (in shares)								10,056	12,677	11,506
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)								$ 1.25	$ 1.20	$ 1.12
Granted (in dollars per share)								$ 2.79	$ 1.31	$ 1.23
Vested (in dollars per share)								$ 1.23	$ 1.18	$ 1.11
Cancelled (in dollars per share)								$ 1.48	$ 1.26	$ 1.16
Outstanding at the end of the period (in dollars per share)								$ 1.66	$ 1.25	$ 1.20