Stock Options and Stock Awards (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Nov. 29, 2014	Nov. 30, 2013
Stock options and stock award Plans
Stock-based compensation costs	$ 16,932	$ 12,194
Total (in shares)	6,422	7,571
Stock options
Fair value assumptions
Expected stock price volatility (as a percent)	74.00%	85.00%
Expected dividend yield (as a percent)	0.00%	0.00%
Risk-free interest rate (as a percent)	1.70%	1.40%
Expected option life	5 years 6 months	5 years 6 months
Shares
Granted (in shares)	3,113	4,828
Weighted Average Fair Value
Granted (in dollars per share)	$ 4.43	$ 1.91
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	20,542
Weighted average amortization period	2 years 8 months 12 days
Stock options \| Maximum
Additional General Disclosures
Vesting period	4 years
Restricted stock
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre tax costs	$ 29,768
Weighted average amortization period	2 years 4 months 24 days
Stock awards
Granted (in shares)	3,309	2,743
Weighted Average Fair Value
Granted (in dollars per share)	$ 7.01	$ 2.79
Restricted stock \| Maximum
Additional General Disclosures
Vesting period	3 years

The total number of shares granted during the period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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