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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Price of a single share of a number of saleable stocks of a company.

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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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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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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 remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Common Stock (Schedule of Transactions under Stock Option Plans) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Weighted Average Exercise Price
Balance Outstanding (usd per share)	$ 71.14
Aggregate Intrinsic Value
Share Price	$ 83.51
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 2.1
Share-based Payment Arrangement, Option [Member]
Weighted Average Number of Shares
Granted (in shares)	188,000
Exercised (in shares)	(144,000)
Cancelled/Forfeited (in shares)	(22,000)
Balance Outstanding (in shares)	740,000
Exercisable (in shares)	334,000
Options Expected to Vest (in shares)	391,000
Weighted Average Exercise Price
Exercised (usd per share)	$ 65.87
Weighted Average Remaining Contractual Term
Balance Outstanding	6 years 10 months 24 days
Exercisable	5 years 3 months 18 days
Options Expected to Vest	8 years 2 months 12 days
Aggregate Intrinsic Value
Balance Outstanding (usd per share)	$ 7,900,000
Exercisable (usd per share)	6,800,000
Options Expected to Vest (usd per share)	1,100,000
Total intrinsic value of options exercised	$ 6,900,000	$ 17,700,000	$ 54,700,000
Share-based Payment Arrangement
Weighted Average Number of Shares
Balance Outstanding (in shares)	718,000
Weighted Average Exercise Price
Granted (usd per share)	$ 103.11
Exercised (usd per share)	60.08
Cancelled/Forfeited (usd per share)	80.54
Balance Outstanding (usd per share)	81.14
Options Expected to Vest (usd per share)	$ 93.56
Aggregate Intrinsic Value
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 5,500,000