Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Income Tax Contingency [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Increased (offset) in valuation allowance	$ 5,700
Net operating loss carryforwards for federal	1,100
Net operating loss carryforwards for state	$ 4,100
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	$ 5,248	$ 3,247	$ 2,439	$ 1,220
Unrecognized tax benefits, that would impact tax rate if recognized	$ 3,000
Federal [Member]
Income Tax Contingency [Line Items]
Open tax years	2011
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	$ 5,400
Zinc Ahead Inc [Member]
Income Tax Contingency [Line Items]
Increased (offset) in valuation allowance	$ 4,600
California [Member]
Income Tax Contingency [Line Items]
Open tax years	2007
California [Member] | Research and Tax Credits [Member]
Income Tax Contingency [Line Items]
Increased (offset) in valuation allowance	$ 1,500
Brazil [Member]
Income Tax Contingency [Line Items]
Increased (offset) in valuation allowance	$ (500)