Stock Options and Stock Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Aug. 29, 2015	Aug. 30, 2014
Stock options and stock award Plans
Stock-based compensation costs	$ 16,201	$ 9,892
Total (in shares)	5,824	6,417
Stock options
Fair value assumptions
Expected stock price volatility (as a percent)	56.00%	74.00%
Expected dividend yield (as a percent)	0.00%	0.00%
Risk-free interest rate (as a percent)	1.70%	1.70%
Expected option life	5 years 6 months	5 years 6 months
Shares
Granted (in shares)	3,647	3,113
Weighted Average Fair Value
Granted (in dollars per share)	$ 4.45	$ 4.43
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	$ 27,657
Weighted average amortization period	3 years
Stock options | Maximum
Additional General Disclosures
Vesting period	4 years
Restricted stock
Shares
Granted (in shares)	2,177	3,304
Weighted Average Fair Value
Granted (in dollars per share)	$ 8.68	$ 7.01
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	$ 32,336
Weighted average amortization period	2 years 6 months
Restricted stock | Maximum
Additional General Disclosures
Vesting period	3 years
Performance based
Stock options and stock award Plans
Stock-based compensation costs	$ 4,413	$ 444
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	$ 33,571
Weighted average amortization period	2 years 2 months 12 days