Income Taxes - Company's Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Deferred tax assets:
Net operating losses	$ 4,053	$ 2,592
Tax credit carry forwards	4,472	3,470
Stock option book expense	2,837	2,689
Allowance for doubtful accounts	1,798	1,704
Allowance for inventory obsolescence	68	94
Accruals not yet deductible for tax purposes	421	620
Other	620us-gaap_DeferredTaxAssetsOther	679us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	14,269us-gaap_DeferredTaxAssetsGross	11,848us-gaap_DeferredTaxAssetsGross
Valuation allowance	(1,379)
Deferred tax assets	12,890us-gaap_DeferredTaxAssetsNet	11,848us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Fixed assets	(636)	(2,172)
Intangible assets	(390)	(435)
Foreign branch taxes	(274)	(1,140)
Other	(4)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities	(1,304)us-gaap_DeferredTaxLiabilities	(3,747)us-gaap_DeferredTaxLiabilities
Unrecognized tax benefits	(237)
Total deferred tax assets, net	$ 11,349us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 8,101us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred tax assets allowances for inventory obsolescence.

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Deferred tax liabilities foreign branch taxes.

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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