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Acquisitions - Additional Information (Detail)
 12 Months Ended
Jan. 31, 2012
USD ($)
Jan. 31, 2011
USD ($)
Installment
Jan. 31, 2011
CAD
May 31, 2012
USD ($)
Apr. 30, 2011
USD ($)
Business Combinations [Abstract]          
Total purchase price   $ 3,984,000 4,194,000    
Consideration of cash paid at closing amount   2,100,000 2,200,000    
Promissory notes   1,425,000 1,500,000    
Working capital adjustment payment   184,000 194,000    
Deferred cash payments     300,000    
Promissory notes interest   6.00% 6.00%    
Number of installments   2 2    
Additional contingent cash payments     750,000    
Revenues Agreements   24 months 24 months    
Contingent consideration   200,000      
Charges to other expenses 400,000        
First stage of the contingent consideration         148,000
Second and final stage of the contingent consideration       $ 450,000