Amount of grant date fair value expensed immediately for awards granted to retirement-eligible grantees.

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1)

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1)

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (f)(2)(ii)

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iv)

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- Definition

Net number of share options (or share units) granted during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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Stock-Based Compensation (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of grant-date fair value expensed immediately for awards granted to retirement-eligible grantees	$ 973	$ 726
Purchase of treasury stock, shares	179,907	106,711
Purchase of treasury stock, aggregate cost basis	3,167	1,591	1,963
Stock option costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	241,860
Grant-date fair value	$ 10.97
Stock options expected term	5 years 6 months
Stock options expected volatility	74.10%
Stock options risk-free interest rate	0.80%
Stock options dividend yield	0.00%
Exercise price of options	$ 17.60
Unrecognized compensation cost	4,850
Weighted-average period of unrecognized compensation cost expected to be recognized	2 years 6 months 7 days
Restricted stock costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	653,447
Grant-date fair value	$ 17.60
Unrecognized compensation cost	22,862
Weighted-average period of unrecognized compensation cost expected to be recognized	2 years 9 months 8 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	299,460
Grant-date fair value	$ 17.78
Unrecognized compensation cost	$ 8,469
Weighted-average period of unrecognized compensation cost expected to be recognized	2 years 11 months 20 days