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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Income Taxes [Line Items]        
Statutory tax rate 34.00% 34.00% 34.00%  
Deferred tax liabilities, not recognized $ 5,600,000      
Cumulative undistributed earnings of foreign subsidiaries 44,000,000      
Gross deferred tax assets, net of deferred tax liabilities before valuation allowance 19,500,000 $ 15,300,000    
Valuation allowance 15,061,000 12,072,000    
Unrecognized tax benefits 37,977,000 30,211,000 $ 4,671,000 $ 3,583,000
Unrecognized tax benefits that would impact effective tax rate 30,100,000      
Income tax liabilities considered as other long term liabilities 1,800,000 10,800,000    
Benefit from interest accruals, reserve released due to the lapse of statute of limitations 64,000      
Interest expense and penalties related to uncertain tax positions   6,000 $ 7,000  
Noncurrent liabilities related to interest and penalties for uncertain tax positions 103,000 $ 166,000    
Long term income taxes payable, including estimated interest and penalties $ 1,900,000      
U.S. federal tax authorities [Member] | Earliest tax year [Member]        
Income Taxes [Line Items]        
Income tax examination, year 2012      
U.S. federal tax authorities [Member] | Latest tax year [Member]        
Income Taxes [Line Items]        
Income tax examination, year 2016      
U.S. state tax authorities [Member] | Earliest tax year [Member]        
Income Taxes [Line Items]        
Income tax examination, year 2007      
U.S. state tax authorities [Member] | Latest tax year [Member]        
Income Taxes [Line Items]        
Income tax examination, year 2016      
Foreign tax authorities [Member] | Earliest tax year [Member]        
Income Taxes [Line Items]        
Income tax examination, year 2011      
Foreign tax authorities [Member] | Latest tax year [Member]        
Income Taxes [Line Items]        
Income tax examination, year 2016      
Federal [Member]        
Income Taxes [Line Items]        
Research and development credit carryforwards $ 10,900,000      
Federal credits begin to expire in fiscal year 2033      
California state [Member]        
Income Taxes [Line Items]        
Research and development credit carryforwards $ 13,800,000