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Share-Based Compensation - Summary of Options Outstanding (Detail) - $ / shares	9 Months Ended
	Oct. 27, 2018	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Weighted Average Exercise Price	$ 14.28
Outstanding Remaining Contractual Life	7 years 3 months 18 days
Exercisable, Weighted Average Exercise Price	$ 12.63
Exercisable Remaining Contractual Life	5 years 9 months 18 days
Number of shares outstanding, total	781,445	745,270
Number of shares exercisable, total	410,678
$5.00 - $10.00 [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	78,181
Outstanding, Weighted Average Exercise Price	$ 7.71
Outstanding Remaining Contractual Life	2 years 9 months 18 days
Exercisable, Number of shares	78,181
Exercisable, Weighted Average Exercise Price	$ 7.71
Exercisable Remaining Contractual Life	2 years 9 months 18 days
$10.01 - $15.00 [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	457,664
Outstanding, Weighted Average Exercise Price	$ 13.65
Outstanding Remaining Contractual Life	7 years 1 month 6 days
Exercisable, Number of shares	302,497
Exercisable, Weighted Average Exercise Price	$ 13.65
Exercisable Remaining Contractual Life	6 years 4 months 24 days
$15.01 - $20.00 [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	245,600
Outstanding, Weighted Average Exercise Price	$ 17.56
Outstanding Remaining Contractual Life	9 years 1 month 6 days
Exercisable, Number of shares	30,000
Exercisable, Weighted Average Exercise Price	$ 15.17
Exercisable Remaining Contractual Life	7 years 8 months 12 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.

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-Section 50
-Paragraph 2
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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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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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