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Stock-Based Compensation - Schedule of Equity-Based Compensation Plans (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Equity-based compensation plans |  |  |  |
Number of Securities to be Issued Upon Exercise of Outstanding Options or Vesting of Performance Share Awards (in shares) | 1,731,277 |  |  |
Weighted-Average Exercise Price of Outstanding Options (in dollars per share) | $ 74.38 | $ 62.62 | $ 57.03 | $ 45.14
Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (in shares) | 4,039,917 |  |  |
Equity compensation plans approved by security holders [Member] |  |  |  |
Equity-based compensation plans |  |  |  |
Number of Securities to be Issued Upon Exercise of Outstanding Options or Vesting of Performance Share Awards (in shares) | 1,731,277 |  |  |
Weighted-Average Exercise Price of Outstanding Options (in dollars per share) | $ 74.38 |  |  |
Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (in shares) | 4,039,917 |  |  |
Equity Compensation Plans Not Approved By Security Holders [Member] |  |  |  |
Equity-based compensation plans |  |  |  |
Number of Securities to be Issued Upon Exercise of Outstanding Options or Vesting of Performance Share Awards (in shares) | 0 |  |  |
Weighted-Average Exercise Price of Outstanding Options (in dollars per share) | $ 0 |  |  |
Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (in shares) | 0 |  |  |

X
- Definition Represents the number of shares (or other type of equity) to be issued under the equity-based compensation plan. + References No definition available. + Details
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- Definition Represents the remaining number of shares (or other type of equity) available for future issuance under the equity-based compensation plan. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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