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Share-Based Compensation - Summary of Options Outstanding (Detail) - $ / shares	6 Months Ended
	Jul. 29, 2017	Apr. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, total	723,470	685,456
Outstanding, Weighted Average Exercise Price	$ 12.33
Exercisable, Weighted Average Exercise Price	$ 11.33
Outstanding Remaining Contractual Life	6 years 10 months 25 days
Number of shares exercisable, total	449,931
Exercisable Remaining Contractual Life	5 years 8 months 12 days
Range Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 5.00
Outstanding Range of Exercise prices, Upper Limit	$ 10.00
Outstanding, Number of shares	174,831
Outstanding, Weighted Average Exercise Price	$ 7.85
Exercisable, Weighted Average Exercise Price	$ 7.85
Outstanding Remaining Contractual Life	3 years 4 months 24 days
Exercisable, Number of shares	174,831
Exercisable Remaining Contractual Life	3 years 4 months 24 days
Range Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 10.01
Outstanding Range of Exercise prices, Upper Limit	$ 15.00
Outstanding, Number of shares	493,639
Outstanding, Weighted Average Exercise Price	$ 13.61
Exercisable, Weighted Average Exercise Price	$ 13.48
Outstanding Remaining Contractual Life	7 years 10 months 25 days
Exercisable, Number of shares	262,600
Exercisable Remaining Contractual Life	7 years 2 months 12 days
Range Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 15.01
Outstanding Range of Exercise prices, Upper Limit	$ 20.00
Outstanding, Number of shares	55,000
Outstanding, Weighted Average Exercise Price	$ 15.07
Exercisable, Weighted Average Exercise Price	$ 15.01
Outstanding Remaining Contractual Life	8 years 8 months 12 days
Exercisable, Number of shares	12,500
Exercisable Remaining Contractual Life	8 years 7 months 6 days

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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 exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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