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Employee Benefits and Stock-based Compensation - Additional Information (Detail) (USD $)
9 Months Ended 12 Months Ended
Oct. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Voting power of all classes of company's shares   10.00% 10.00% 10.00%
Term of up to 10 years from grant date   10 years 10 years 10 years
Vesting period of stock options   Vest 25% on the first anniversary date of the grant and the remainder ratably over the following 36 months Vest 25% on the first anniversary date of the grant and the remainder ratably over the following 36 months Vest 25% on the first anniversary date of the grant and the remainder ratably over the following 36 months
Restricted stock units granted 344,671 345,171    
Estimated fair value of restricted stock units, grant date $ 9.99 $ 9.99    
Vesting period of RSUs 1/16th of the RSUs shall vest each 3 months, 100% vest on the fourth anniversary date 1/16th of the RSUs shall vest each 3 months, 100% vest on the fourth anniversary date    
Percentage of salary contribution by employees   10.00%    
Percentage of purchase price of ordinary shares   85.00%    
Unvested early exercised options, repurchased   84,377 76,982  
Unvested shares subject to the Company's repurchase rights   53,151 122,064  
Amount of income tax benefit recognized on stock-based compensation   $ 507,000 $ 473,000 $ 111,000
Income tax benefit recognized on stock-based compensation which is recorded in paid-in capital   7,000 125,000  
Closing price of ordinary shares   $ 9.96    
Aggregate intrinsic value of unvested restricted stock units   3,400,000    
Non-employee stock-based compensation           
Accelerate aggregate stock options     22,222  
Additional stock-based compensation     206,000  
Unvested stock options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost   7,300,000 9,500,000  
Weighted-average period   2 years 3 months 4 days 2 years 8 months 12 days  
Unvested restricted stock units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost   $ 2,400,000    
Weighted-average period   1 year 9 months 7 days    
Incentive Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of stock options as percentage of fair market value at grant date   110.00%    
Non Statutory Stock Option Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of stock options as percentage of fair market value at grant date   100.00%