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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (decrease) in valuation allowance	$ (3,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	$ 27,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Recognized tax benefits excluding interest and penalties	707,000us-gaap_UnrecognizedTaxBenefits	715,000us-gaap_UnrecognizedTaxBenefits	941,000us-gaap_UnrecognizedTaxBenefits
Impact on effective tax rate, decrease	493,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Recognized expense related to interest and penalties	43,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	68,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accrued potential interest and penalties	460,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	416,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Undistributed earnings of foreign subsidiaries	$ 3,909,000us-gaap_UndistributedEarningsOfForeignSubsidiaries

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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