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

No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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.

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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

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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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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- 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

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-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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- Definition

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

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- Definition

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

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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 Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph c(1)

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ 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.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

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-Name Regulation S-X (SX)

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-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section B

-Paragraph 7

-Subparagraph b

-Chapter 1

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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Stock-Based Compensation (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Apr. 30, 2013	Apr. 30, 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	78,844
Purchase of treasury stock, aggregate cost basis	3,167	1,182	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 option	$ 17.60
Unrecognized compensation cost	5,524
Weighted average period of unrecognized compensation cost expected to be recognized	2 years 8 months 15 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	25,584
Weighted average period of unrecognized compensation cost expected to be recognized	2 years 11 months 18 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	$ 9,205
Weighted average period of unrecognized compensation cost expected to be recognized	3 years 2 months 15 days