Income Taxes - Company's Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Deferred tax assets:
Net operating losses	$ 2,592	$ 1,246
Tax credit carry forwards	3,470	3,449
Stock option book expense	2,689	2,605
Allowance for doubtful accounts	1,704	1,752
Allowance for inventory obsolescence	94	192
Accruals not yet deductible for tax purposes	620	692
Other	679	675
Gross deferred tax assets	11,848	10,611
Valuation allowance
Deferred tax assets	11,848	10,611
Deferred tax liabilities:
Fixed assets	(2,172)	(1,841)
Intangible assets	(435)	(595)
Foreign branch taxes	(1,140)	(1,626)
Other		(411)
Deferred tax liabilities	(3,747)	(4,473)
Total deferred tax assets, net	$ 8,101	$ 6,138