Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Aug. 30, 2014	Aug. 31, 2013
Numerator for income (loss) per share:
Net income	$ 127,849	$ 32,827	$ 169,295	$ 122,489
Accretion of redeemable preferred stock		(26)		(51)
Cumulative preferred stock dividends		(2,772)		(5,504)
Income attributable to common stockholders-basic	127,849	30,029	169,295	116,934
Add back-interest on convertible notes	1,364		2,728	2,728
Income attributable to common stockholders-diluted	$ 129,213	$ 30,029	$ 172,023	$ 119,662
Denominator:
Basic weighted average shares	970,664	901,992	966,997	897,993
Outstanding options and restricted shares, net (in shares)	26,132	44,726	26,141	40,143
Convertible notes	24,796		24,796	24,800
Diluted weighted average shares	1,021,592	946,718	1,017,934	962,936
Basic income per share (in dollars per share)	$ 0.13	$ 0.03	$ 0.18	$ 0.13
Diluted income per share (in dollars per share)	$ 0.13	$ 0.03	$ 0.17	$ 0.12
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income per share	2,836	97,923	2,836	77,777
Stock options
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income per share	2,836	39,014	2,836	43,668
Convertible notes
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income per share		24,800
Convertible preferred stock
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income per share		34,109		34,109