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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail)	9 Months Ended
	Oct. 27, 2018 $ / shares shares
Share Based Compensation [Abstract]
Beginning balance, Number of Options | shares	745,270
Granted, Number of Options | shares	196,000
Exercised, Number of Options | shares	(144,875)
Forfeited, Number of Options | shares	(11,250)
Canceled, Number of Options | shares	(3,700)
Ending balance, Number of Options | shares	781,445
Beginning balance, Weighted-Average Exercise Price Per Share | $ / shares	$ 12.52
Granted, Weighted-Average Exercise Price Per Share | $ / shares	18.21
Exercised, Weighted-Average Exercise Price Per Share | $ / shares	10.65
Forfeited, Weighted-Average Exercise Price Per Share | $ / shares	14.61
Cancelled, Weighted-Average Exercise Price Per Share | $ / shares	8.95
Ending balance, Weighted-Average Exercise Price Per Share | $ / shares	$ 14.28

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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Gross number of share options (or share units) granted during the period.

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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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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 of the plan that expired.

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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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Number of share options (or share units) exercised during the current period.

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