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Capital Stock (Details) - $ / shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Outstanding Shares [Roll Forward]
Shares outstanding	157,955,433	158,064,750	157,462,140
Exercised stock options	36,731	151,399	534,291
Exercise of employee stock purchase plan	150,909	146,135	182,971
Vesting of restricted stock units, net of shares withheld for taxes	195,156	182,024	242,112
Shares outstanding	155,844,138	157,955,433	158,064,750
Stock repurchased under buyback program	(2,654,254)	(651,271)	(418,374)
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		62,396
Preferred Stock, Shares Authorized	20
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Performance Shares [Member]
Outstanding Shares [Roll Forward]
Settlement of performance-based restricted stock units, net of shares withheld for taxes	240,412,000,000	103,058,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	160,163		61,610

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Outstanding Shares [Roll Forward]

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Number, after shares used to satisfy grantee's tax withholding obligation for award under share-based payment arrangement, of restricted shares issued. Excludes cash used to satisfy grantee's tax withholding obligation.

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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