Reconciliation of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Feb. 25, 2017	Feb. 27, 2016	Feb. 28, 2015
Options Outstanding
Beginning Balance	2,546,228
Granted	1,450,635
Exercised	(178,480)
Forfeited and expired	(225,791)
Ending Balance	3,592,592	2,546,228
Options exercisable at period end	1,816,854
Weighted Average Exercise Price Per Share
Beginning Balance (in USD per share)	$ 21.81
Granted (in USD per share)	20.04
Exercised (in USD per share)	16.04
Forfeited (in USD per share)	22.22
Ending Balance (in USD per share)	21.35	$ 21.81
Options exercisable at period end (in USD per share)	$ 21.14
Weighted Average Remaining Contractual Life (Years)
Outstanding Ending Balance	7 years 5 months 7 days
Exercisable Ending Balance	6 years 4 months 7 days
Aggregate Intrinsic Value
Exercised	$ 1,257	$ 1,100	$ 6,700
Ending balance	1,719
Options exercisable at period end	$ 1,694

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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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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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.

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

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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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 vested portions of options outstanding and currently exercisable or convertible, 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 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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Number of share options (or share units) exercised during the current period.

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