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Shareholders' Equity - Summary of Options Outstanding (Detail) (USD $)			12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014 Range One [Member]	Jan. 31, 2014 Range Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit			$ 5.78	$ 8.74
Outstanding Range of Exercise prices, Upper Limit			$ 8.73	$ 11.90
Outstanding, Options			500,422	236,225
Option outstanding, total	736,647	916,612
Outstanding, Weighted Average Exercise Price			$ 7.66	$ 10.68
Exercisable, Weighted Average Exercise Price			$ 7.57	$ 10.73
Outstanding Remaining Contractual Life			4 years 8 months 12 days	4 years 8 months 12 days
Exercisable, Options			390,299	180,025
Options exercisable , total	570,324

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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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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

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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 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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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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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.

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