Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Line Items]
Net deferred tax assets		$ 15,310	$ 13,139
Reduction in valuation allowance	12,501	104	(155)	12,501
United States federal net operating loss carryforwards		27,118
State net operating loss carryforwards		1,195
Period of change in ownership		3 years
Unrecognized tax benefits	2,407	2,167	2,259	2,407
Amount of interest and penalties related to uncertain tax positions		59	40
Income tax examination, description		With limited exceptions, the Company is no longer subject to state or local examinations for years prior to January 31, 2009. However, carryforward attributes that were generated prior to January 31, 2010 may still be adjusted upon examination by federal, state or local tax authorities if they either have been or will be used in a future period.
Unremitted earnings of international subsidiaries		4,050
Federal [Member]
Income Tax Disclosure [Line Items]
Operating loss carryforwards, expiration dates		2017
Tax credit carryforwards, expiration date		Begin to expire in 2017
Federal tax credit carryforwards		4,145
State [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards, expiration date		Begin to expire in 2015
Stock Options [Member]
Income Tax Disclosure [Line Items]
Federal and state net operating losses carryforwards		115
Research and Development [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards, expiration date		Begin to expire in 2021
Research and development credit carryforwards, state		1,134
State Investment Tax Credits and R&D Credits [Member]
Income Tax Disclosure [Line Items]
Reduction in valuation allowance			$ 155
Minimum [Member]
Income Tax Disclosure [Line Items]
Threshold percentage for change in ownership		50.00%
Tax benefit		50.00%