Stock Options and Stock Awards - Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Feb. 29, 2020	Mar. 02, 2019	Mar. 03, 2018
Fair value assumptions
Expected dividend yield (as a percent)	0.00%
Weighted average fair value of options granted (in dollars per share)	$ 3.66	$ 0.00	$ 21.60
Options, Shares activity
Outstanding at the beginning of the period (in shares)	1,036	1,343	1,694
Granted (in shares)	612		50
Cancelled (in shares)	(353)	(208)	(160)
Outstanding at the end of the period (in shares)	1,295	1,036	1,343
Vested or expected to vest at the end of the period (in shares)	1,295
Exercisable at the end of the period (in shares)	683
Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 50.15	$ 51.42	$ 54.93
Granted (in dollars per share)	7.21		41.00
Exercised (in dollars per share)		23.07	24.05
Cancelled (in dollars per share)	48.56	71.07	126.61
Outstanding at the end of the period (in dollars per share)	30.29	$ 50.15	$ 51.42
Vested or expected to vest at the end of the period (in dollars per share)	30.29
Exercisable at the end of the period (in dollars per share)	$ 50.97
Options, Additional Disclosures
Contractual term, Outstanding at the end of the period	5 years 7 months 9 days
Contractual term, Vested or expected to vest at the end of the period	5 years 7 months 9 days
Contractual term, Exercisable at the end of the period	2 years 1 month 20 days
Intrinsic value, Outstanding at the end of the period	$ 3,920
Intrinsic value, Vested or expected to vest at the end of the period	3,920
Intrinsic value, Exercisable at the end of the period	0
Additional General Disclosures
Total intrinsic value of options exercised	$ 0	$ 726	$ 3,032
Stock options
Fair value assumptions
Expected stock price volatility (as a percent)	56.00%		58.00%
Expected dividend yield (as a percent)	0.00%		0.00%
Risk-free interest rate (as a percent)	1.50%		1.90%
Expected option life (in years)	5 years 6 months		5 years 6 months
Unrecognized pre-tax compensation costs related to unvested stock options and restricted stock grants
Unrecognized pre-tax costs	$ 1,916
Weighted average amortization period	3 years 2 months 26 days
Additional General Disclosures
Cash received from stock option exercises	$ 0	2,294	$ 5,796
Income tax benefit from stock options	$ 0	$ 7	$ 10
Vesting period	4 years

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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