Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Income Taxes [Line Items]
U.S. federal income tax rate	34.00%	34.00%	34.00%
Deferred tax liabilities, not recognized	$ 3,200,000
Cumulative undistributed earnings of foreign subsidiaries	22,000,000
Gross deferred tax assets, net of deferred tax liabilities before valuation allowance	5,035,000	3,401,000
Unrecognized tax benefits	3,583,000	3,018,000	2,213,000	2,007,000
Unrecognized tax benefits that would impact effective tax rate	2,400,000
Income tax liabilities considered as other long term liabilities	1,300,000	1,200,000
Interest expense and penalties related to uncertain tax positions	37,000	23,000	37,000
Noncurrent liabilities related to interest and penalties for uncertain tax positions	153,000	116,000
Long term income taxes payable, including estimated interest and penalties	1,500,000
Federal [Member]
Income Taxes [Line Items]
Research and development credit carryforwards	400,000
Credits begin to expire in fiscal year	2033
California state [Member]
Income Taxes [Line Items]
Research and development credit carryforwards	$ 3,300,000