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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Contingency [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Net operating loss carryforwards for federal	$ 2,000,000
Net operating loss carryforwards for state	4,100,000
Federal net operating loss expire year	2033
State net operating loss expire year	2033
Percentage of likely of being realized upon the effective settlement	50.00%
Gross unrecognized tax benefits	3,247,000us-gaap_UnrecognizedTaxBenefits	2,439,000us-gaap_UnrecognizedTaxBenefits	1,220,000us-gaap_UnrecognizedTaxBenefits	644,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, that would impact tax rate if recognized	2,000,000
Undistributed cumulative earnings of foreign subsidiaries	3,300,000
Undistributed cumulative earnings of Domestic subsidiaries	400,000
Federal [Member]
Income Tax Contingency [Line Items]
Open tax years	2011
California [Member]
Income Tax Contingency [Line Items]
Open tax years	2007
Other states [Member]
Income Tax Contingency [Line Items]
Open tax years	2010
Foreign Jurisdictions [Member]
Income Tax Contingency [Line Items]
Open tax years	2011
California research and development [Member]
Income Tax Contingency [Line Items]
Research and development tax credits	$ 2,800,000