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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 20, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Nov. 13, 2020
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) |  |  |  | 0 | 1,400,000 |  |
Stock repurchased during period, value |  |  |  |  | $ 115,000,000 |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 1,000,000,000 |  | $ 100,000,000 |  |  |  |
Accelerated Share Repurchase Initial Delivery Percent of Total | 80.00% |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  | $ 114,994,000 | $ 1,100,000,000 |
Rockwell Automation |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 1,000,000,000 |  |  |  |  |
Stock issued for equity investment |  | 10,582,010,000 |  |  |  |  |
Price per share (in dollars per share) |  | $ 94.50 |  |  |  | $ 94.50 |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchased during period (in shares) | 8,200,000 |  | 1,200,000 |  | 3,000,000.0 | 8,200,000 |
Accelerated Share Repurchase Agreement | Final settlement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  | $ 200,000,000 |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock authorized to repurchase |  |  |  |  |  |  | $ 1,000,000,000
Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  | 500,000,000 |  |  |
Stock authorized to repurchase |  |  |  | $ 1,500,000,000 |  |  |
Series A Junior Participating Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  | 500,000 |  |  |

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