Percentage of vesting of share-based compensation awards.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award options expiration period.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award other than options grants in period weighted average exercise price.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award other than options weighted average market value of underlying stock at grant date.

+ References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-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.

+ References

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- Definition

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

+ References

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Stock-Based Compensation - Stock Option Assumptions (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended	9 Months Ended									1 Months Ended	9 Months Ended
	Sep. 30, 2012	Jan. 31, 2008	Jul. 31, 2008	Apr. 30, 2013 Service Based Option [Member]	Apr. 30, 2012 Service Based Option [Member]	Apr. 30, 2012 Performance Based Options [Member]	Apr. 30, 2013 Performance Based Options [Member]	Apr. 30, 2013 Restricted Stock Units (RSUs) [Member] Maximum [Member]	Apr. 30, 2013 Service Based Option [Member]	Apr. 30, 2013 Service Based Option [Member] Maximum [Member]	Apr. 30, 2013 Restricted Stock [Member] Maximum [Member]	Apr. 30, 2013 Restricted Stock [Member] Minimum [Member]	Dec. 31, 2012 Cliff-Vested Restricted Shares [Member]	Apr. 30, 2013 Cliff-Vested Restricted Shares [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								2 years		3 years	7 years	5 years		3 years
Expiration period of options							10 years		10 years
Expected term				5 years 11 months 9 days	5 years 10 months 21 days	6 years 6 months 26 days
Expected volatility				38.68%	39.41%	39.21%
Expected dividend yield				2.21%	2.07%	1.99%
Risk-free interest rate				0.90%	1.16%	2.05%
Weighted-average market value of underlying stock at grant date (USD per share)				$ 30.54	$ 27.05	$ 29.55
Weighted average exercise price (USD per share)	$ 30.21	$ 32.83		$ 30.54	$ 27.05	$ 29.55							$ 32.99
Weighted-average fair value of options granted during the period (USD per share)	$ 30.21		$ 32.83	$ 9.05	$ 8.42	$ 10.01			$ 9.05				$ 32.99
Vesting period of service based stock options				33.33%