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Shareholders' Equity - Aggregated Information Regarding Stock Options Granted (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning balance, Number of Shares | 916,612 |
Options Granted, Number of Shares | 56,800 |
Options Exercised, Number of Shares | (210,790) | (66,313)
Options Expired, Number of Shares | (25,975) |
Ending balance, Number of Shares | 736,647 | 916,612
Options Exercisable, Number of Shares | 570,324 |
Beginning balance, Weighted Average Option Price Per Share | $ 8.46 |
Options Granted, Weighted Average Option Price Per Share | $ 10.54 |
Options Exercised, Weighted Average Option Price Per Share | $ 8.33 |
Options Expired, Weighted Average Option Price Per Share | $ 9.42 |
Ending balance, Weighted Average Option Price Per Share | $ 8.63 | $ 8.46
Options Exercisable, Weighted Average Option Price Per Share | $ 8.57 |
Range One [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding, Option Price Per Share, Lower range, Ending balance |  | $ 2.40
Options Outstanding, Option Price Per Share, Upper range, Ending balance |  | $ 11.90
Range Two [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Granted, Option Price Per Share, Lower range | $ 10.50 |
Options Granted, Option Price Per Share, Upper range | $ 10.60 |
Range Three [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Exercised, Option Price Per Share, Lower range | $ 2.40 |
Options Exercised, Option Price Per Share, Upper range | $ 11.90 |
Range Four [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Expired, Option Price Per Share, Lower range | $ 2.40 |
Options Expired, Option Price Per Share, Upper range | $ 11.90 |
Range Five [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Outstanding, Option Price Per Share, Lower range, Ending balance | $ 5.78 |
Options Outstanding, Option Price Per Share, Upper range, Ending balance | $ 11.90 |
Range Six [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options Exercisable, Option Price Per Share, Lower range | $ 5.78 |
Options Exercisable, Option Price Per Share, Upper range | $ 11.90 |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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