Share-Based Compensation - Summary of Stock Options Outstanding (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, Beginning Balance	3,457,351
Stock Options, Exercised	(1,451,952)
Stock Options, Forfeited, canceled or expired	(36,777)
Stock Options, Ending Balance	1,968,622
Stock Options, Vested at ending balance	1,968,622
Stock Options, Exercisable at ending balance	1,968,622
Weighted Average Exercise Price, Beginning of Period	$ 40.61
Weighted Average Exercise Price, Exercised	$ 36.14
Weighted Average Exercise Price, Forfeited, canceled or expired	$ 32.89
Weighted Average Exercise Price, End of Period	$ 44.06
Stock Options, Weighted Average Exercise Price, Vested at ending balance	$ 44.06
Stock Options, Weighted Average Exercise Price, Exercisable at ending balance	$ 44.06
Stock Options, Weighted Average Remaining Contractual Term (Years), Balance at ending balance	1 year 5 months 1 day
Stock Options, Weighted Average Remaining Contractual Term (Years), Vested at ending balance	1 year 5 months 1 day
Stock Options, Weighted Average Remaining Contractual Term (Years), Exercisable at ending balance	1 year 5 months 1 day
Stock Options, Aggregate Intrinsic Value, Balance at ending balance	$ 67,920
Stock Options, Aggregate Intrinsic Value, Vested at ending balance	67,920
Stock Options, Aggregate Intrinsic Value, Exercisable at ending balance	$ 67,920

Share Based Compensation Arrangement By Share Based Payment Award Options Vested Outstanding Aggregate Intrinsic Value

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average price of options that were either forfeited or expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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