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Stockholders' Equity (Detail) (USD $)					12 Months Ended
	Sep. 30, 2014	Sep. 30, 2010	Sep. 30, 2009	Dec. 02, 2005	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum	Sep. 30, 2014 Options granted to employees Performance-based	Sep. 30, 2014 Options granted to employees Performance-based Minimum	Sep. 30, 2014 Options granted to employees Performance-based Maximum	Sep. 30, 2014 Incentive stock options Holder of at least 10% of common stock Minimum	Sep. 30, 2014 Employee and director options	Sep. 30, 2013 Employee and director options	Sep. 30, 2012 Employee and director options	Sep. 30, 2011 Employee and director options	Sep. 30, 2010 Employee and director options	Sep. 30, 2014 Employee and director options Minimum	Sep. 30, 2013 Employee and director options Minimum	Sep. 30, 2012 Employee and director options Minimum	Sep. 30, 2011 Employee and director options Minimum	Sep. 30, 2010 Employee and director options Minimum	Sep. 30, 2014 Employee and director options Maximum	Sep. 30, 2013 Employee and director options Maximum	Sep. 30, 2012 Employee and director options Maximum	Sep. 30, 2011 Employee and director options Maximum	Sep. 30, 2010 Employee and director options Maximum	Sep. 30, 2014 Restricted shares	Sep. 30, 2013 Restricted shares	Sep. 30, 2012 Restricted shares	Sep. 30, 2011 Restricted shares	Sep. 30, 2010 Restricted shares	Sep. 30, 2014 Restricted shares Minimum	Sep. 30, 2013 Restricted shares Minimum	Sep. 30, 2012 Restricted shares Minimum	Sep. 30, 2011 Restricted shares Minimum	Sep. 30, 2010 Restricted shares Minimum	Sep. 30, 2014 Restricted shares Maximum	Sep. 30, 2013 Restricted shares Maximum	Sep. 30, 2012 Restricted shares Maximum	Sep. 30, 2011 Restricted shares Maximum	Sep. 30, 2010 Restricted shares Maximum	Sep. 30, 2013 Restricted shares Performance-based Non-employee	Sep. 30, 2012 Restricted shares Performance-based Non-employee	Sep. 30, 2014 Options or stock appreciation rights Maximum	Sep. 30, 2014 Other than options or stock appreciation rights Maximum
2006 Omnibus Long-Term Incentive Plan (the 2006 Plan)
Actual payout as a percent of employee target payout, based upon the entity's actual performance during the previous twelve months								0.00%	100.00%
Shares available for issuance				10,000,000
Remaining shares reserved for issuance	772,227	3,986,513	5,189,996
Options granted (in shares)											437,755	171,994	181,783	321,072	624,566
Options granted, exercise prices (in dollars per share)											$ 22.41	$ 35.76	$ 34.42			$ 21.53	$ 29.47	$ 31.37	$ 14.30	$ 9.05	$ 31.37	$ 46.72	$ 42.31	$ 17.02	$ 13.96
Options forfeited (in shares)											181,094	32,244	78,148	73,591	75,467
Restricted shares granted (in shares)																										1,040,748	997,857	633,647	736,340	699,410											335,000	100,000
Restricted shares granted (in dollars per share)																										$ 18.78	$ 36.97	$ 34.05			$ 13.11	$ 29.47	$ 31.37	$ 12.88	$ 9.05	$ 38.09	$ 42.47	$ 52.55	$ 25.52	$ 13.96
Restricted shares forfeited (in shares)																										250,586	403,083	138,052	150,112	45,026											281,500
Number of shares awarded per person per year																																											1,000,000	700,000
Shares and options vesting period					1 year	4 years	12 months
Exercise price of stock option as a percentage of the fair market value of the common stock on the date of grant										110.00%						100.00%
Term of stock option																					10 years

X

- Definition

Represents the actual payout as a percent of employee target payout which is based upon the entity's actual performance during the previous twelve months.

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- Definition

Represents the number of shares that can be awarded to any person under the stock based compensation plan per year.

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification

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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).

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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).

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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-Publisher FASB

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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-Publisher FASB

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

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Purchase price of common stock expressed as a percentage of its fair value.

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

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