Stock Options and Stock Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 27, 2016	Feb. 28, 2015	Mar. 01, 2014
Stock options and stock award Plans
Stock-based compensation costs	$ 37,948	$ 23,390	$ 16,194
Shares of common stock authorized under stock-based compensation plans	61,446
Maximum
Stock options and stock award Plans
Term of options	10 years
Stock options
Fair value assumptions
Expected stock price volatility (as a percent)	56.00%	74.00%	85.00%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Risk-free interest rate (as a percent)	1.70%	1.70%	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)	$ 4.45	$ 4.43	$ 1.91
Cash received from stock option exercises	$ 11,376	$ 24,117	$ 33,217
Income tax benefit from stock options	11,764	30,099	23,660
Total intrinsic value of options exercised	$ 42,207	$ 92,355	$ 80,598
Vesting period	4 years
Shares
Outstanding at the beginning of the period (in shares)	41,668	55,966	81,000
Granted (in shares)	3,579	3,097	4,828
Exercised (in shares)	(6,400)	(16,485)	(26,873)
Cancelled (in shares)	(722)	(910)	(2,989)
Outstanding at the end of the period (in shares)	38,125	41,668	55,966
Vested or expected to vest at the end of the period (in shares)	36,062
Exercisable at the end of the period (in shares)	27,836
Weighted Average Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)	$ 2.09	$ 1.65	$ 1.48
Granted (in dollars per share)	8.68	7.04	2.76
Exercised (in dollars per share)	1.78	1.46	1.24
Cancelled (in dollars per share)	4.20	3.16	2.46
Outstanding at the end of the period (in dollars per share)	2.73	$ 2.09	$ 1.65
Vested or expected to vest at the end of the period (in dollars per share)	2.65
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	5 years 7 months 21 days
Vested or expected to vest at the end of the period	5 years 6 months 15 days
Exercisable at the end of the period	4 years 9 months 11 days
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 202,027
Vested or expected to vest at the end of the period	193,716
Exercisable at the end of the period	172,288
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Total unrecognized pre-tax compensation costs, net of forfeitures	$ 21,933
Weighted-average period over which remaining share-based cost is expected to be recognized	2 years 7 months 24 days
Restricted stock
Additional General Disclosures
Total fair value of awards vested during the period	$ 15,104	$ 8,090	$ 5,098
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Total unrecognized pre-tax compensation costs, net of forfeitures	$ 26,040
Weighted-average period over which remaining share-based cost is expected to be recognized	2 years 22 days
Shares
Outstanding at the beginning of the period (in shares)	7,666	10,056	12,677
Granted (in shares)	2,752	3,303	2,743
Vested (in shares)	(5,140)	(5,239)	(4,152)
Cancelled (in shares)	(420)	(454)	(1,212)
Outstanding at the end of the period (in shares)	4,858	7,666	10,056
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 3.84	$ 1.66	$ 1.25
Granted (in dollars per share)	8.60	7.01	2.79
Vested (in dollars per share)	2.94	1.54	1.23
Cancelled (in dollars per share)	6.89	5.00	1.48
Outstanding at the end of the period (in dollars per share)	$ 7.23	$ 3.84	$ 1.66
Restricted stock | Maximum
Additional General Disclosures
Vesting period	3 years
Performance based
Stock options and stock award Plans
Stock-based compensation costs	$ 12,634	$ 1,769	$ 0
2000 Plan
Stock options and stock award Plans
Shares of common stock reserved for the granting of stock options and other incentive awards	22,000
2001 Plan
Stock options and stock award Plans
Shares of common stock authorized under stock-based compensation plans	20,000
2004 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock authorized under stock-based compensation plans	20,000
2006 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	50,000
2010 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	35,000
2012 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	28,500
2014 Omnibus Equity Plan
Stock options and stock award Plans
Shares of common stock available for grant	58,000
2014 Omnibus Equity Plan | Stock options | Maximum
Stock options and stock award Plans
Shares of common stock available for grant	25,000