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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 |

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