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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 20, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized |  | 5,000,000 | 5,000,000 |  |
Common stock, shares authorized |  | 500,000,000 | 500,000,000 |  |
Stock repurchased during period (in shares) |  | 200,000 | 0 | 1,400,000 |
Stock repurchased during period, value |  | $ 30,000,000 |  | $ 115,000,000 |
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 1,000,000,000 |  |  |  |
Accelerated Share Repurchase Initial Delivery Percent of Total | 80.00% |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ 30,000,000 |  | $ 114,994,000 |
Accelerated Share Repurchase Agreement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock repurchased during period (in shares) | 8,200,000 |  |  | 3,000,000.0 |
Accelerated Share Repurchase Agreement | Final settlement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  | $ 200,000,000
Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 500,000,000 |  |  |
Stock authorized to repurchase |  | $ 1,000,000,000 |  |  |
Series A Junior Participating Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized |  | 500,000 |  |  |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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