Share-Based Compensation - Summary of Options Outstanding (Detail) (USD $)	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option outstanding, total	656,011	736,647
Options exercisable , total	413,612
Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 5.78
Outstanding Range of Exercise prices, Upper Limit	$ 8.73
Outstanding, Options	314,365
Outstanding, Weighted Average Exercise Price	$ 7.64
Exercisable, Weighted Average Exercise Price	$ 7.54
Outstanding Remaining Contractual Life	5 years 1 month 6 days
Exercisable, Options	254,516
Range Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 8.95
Outstanding Range of Exercise prices, Upper Limit	$ 13.46
Outstanding, Options	190,046
Outstanding, Weighted Average Exercise Price	$ 10.79
Exercisable, Weighted Average Exercise Price	$ 10.76
Outstanding Remaining Contractual Life	4 years 3 months 18 days
Exercisable, Options	159,096
Range Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 13.80
Outstanding Range of Exercise prices, Upper Limit	$ 14.20
Outstanding, Options	151,600
Outstanding, Weighted Average Exercise Price	$ 14.00
Outstanding Remaining Contractual Life	9 years 2 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.

+ 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)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 718

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The ceiling 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Paragraph 2

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