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Summary of Significant Accounting Policies (Details)
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12 Months Ended | ||
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Jan. 31, 2013
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Jan. 31, 2012
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Jan. 31, 2011
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| Weighted average shares used in calculating earnings per share - Basic (in shares) | 32,493,799 | 32,093,125 | 31,434,398 |
| Dilutive common stock equivalents | 0 | 0 | 551,404 |
| Weighted average shares used in calculating earnings per share - Diluted (in shares) | 32,494,000 | 32,093,000 | 31,986,000 |
| X | ||||||||||
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- Definition
The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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