Percentage of vesting of share-based compensation awards.

No definition available.

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- Definition

The number of shares available for future issuance of stock options and restricted shares under the entity's various plans.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Total fair value of stock options vested.

+ 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 Authorized Restricted Stock Units Outstanding Number Of Shares

+ References

No definition available.

+ Details

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- Definition

Share based compensation net of tax.

+ References

No definition available.

+ Details

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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.

+ References

+ Details

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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

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-Subparagraph a

-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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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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

+ Details

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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

+ Details

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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

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-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.

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-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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(i)-(ii)

-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 b(2)(b)

-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)(a)

-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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

+ Details

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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

+ Details

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

+ Details

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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.

+ Details

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Stock Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended						1 Months Ended		9 Months Ended
	Sep. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Jan. 31, 2008	Apr. 30, 2013	Apr. 30, 2012	Jul. 31, 2008	Jan. 08, 2008	Aug. 31, 2010 Subsequent Event [Member]	Apr. 30, 2013 Total unvested stock-based compensation expense reversal [Domain]	Apr. 30, 2013 Unvested performance-based expense reversal [Domain]	Apr. 30, 2013 Service Based Option [Member]	Apr. 30, 2013 Service Based Option [Member] Maximum [Member]	Apr. 30, 2013 Performance Based Options [Member]	Apr. 30, 2013 Restricted Stock [Member] Minimum [Member]	Apr. 30, 2013 Restricted Stock [Member] Maximum [Member]	Apr. 30, 2013 Class A nonvoting common stock [Member]	Dec. 31, 2012 Cliff-Vested Restricted Shares [Member]	Sep. 30, 2012 Cliff-Vested Restricted Shares [Member]	Apr. 30, 2013 Cliff-Vested Restricted Shares [Member] Maximum [Member]	Apr. 30, 2013 Restricted Stock Units (RSUs) [Member] Maximum [Member]	Apr. 30, 2013 Service Based Option [Member]	Apr. 30, 2012 Service Based Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period													3 years		5 years	7 years				3 years	2 years
Expiration period of options												10 years		10 years
Vesting period of service based stock options																						33.33%
Outstanding stock options and restricted shares of Class A Nonvoting Common Stock																	6,205,350
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized For Future Issuance																	4,198,516
Share-based Compensation		$ 155	$ 2,102		$ 6,964	$ 7,592				$ 2,186	$ 1,286
Total stock compensation expense, net of tax		94	1,282		4,248	4,631
Unrealized compensation cost related to share-based compensation, pre tax		11,484			11,484
Weighted average period remaining					1 year 8 months 12 days
Performance based restricted shares outstanding	10,000	310,000			310,000			210,000	100,000									5,000	5,000
Weighted average exercise price (USD per share)	$ 30.21			$ 32.83					$ 28.35									$ 32.99				$ 30.54	$ 27.05
Restricted stock units outstanding		10,000			10,000
Shares outstanding, new grants												815,450		0
Weighted average exercise price (USD per share)												$ 30.54
Weighted-average fair value of options granted during the period (USD per share)	$ 30.21						$ 32.83		$ 28.35			$ 9.05						$ 32.99				$ 9.05	$ 8.42
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.		3,736,320	3,848,048		3,736,320	3,848,048
Weighted average exercise price of options exercisable		$ 30.70	$ 29.67		$ 30.70	$ 29.67
Proceeds from Stock Options Exercised		5,837	1,441		10,246	3,624
Tax benefit on options exercised		495	166		1,760	761
Total fair value of stock options vested		7,360	2,987		7,360	2,987
Total intrinsic value of options exercised					$ 10,860	$ 8,035