Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 01, 2012	Nov. 26, 2011	Dec. 01, 2012	Nov. 26, 2011
Numerator for income (loss) per share:
Net income (loss)	$ 61,871	$ (51,985)	$ (4,982)	$ (207,321)
Accretion of redeemable preferred stock	(26)	(26)	(77)	(77)
Cumulative preferred stock dividends	(2,651)	(2,498)	(7,837)	(7,384)
Income (loss) attributable to common stockholders-basic	59,194	(54,509)	(12,896)	(214,782)
Plus: Interest on convertible notes	1,334
Income (loss) attributable to common stockholders-diluted	$ 60,528	$ (54,509)	$ (12,896)	$ (214,782)
Denominator:
Basic weighted average shares	891,031	886,629	889,187	885,388
Outstanding options, net	1,977
Convertible notes	24,800
Diluted weighted average shares	917,808	886,629	889,187	885,388
Basic and diluted income (loss) per share (in dollars per share)	$ 0.07	$ (0.06)	$ (0.01)	$ (0.24)
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income (loss) per share	103,487	132,071	140,588	132,071
Stock options
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income (loss) per share	70,868	76,537	83,169	76,537
Convertible debt
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income (loss) per share		24,800	24,800	24,800
Convertible preferred stock
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income (loss) per share	32,619	30,734	32,619	30,734
Restricted shares and restricted stock units
Antidilutive securities excluded from computation of earnings per share
Potential common shares excluded from the computation of diluted income (loss) per share			12,753	11,567