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Stockholders' Equity (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 20, 2018 | Jul. 19, 2018 | Mar. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  | 5,000,000.0 | 5,000,000 |
Common stock, shares authorized |  |  |  | 500,000,000 | 500,000,000 |
Stock authorized to repurchase |  |  |  | $ 1,500,000,000 |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 1,000,000,000 |  |  |  |  |
Repurchases of common stock, value |  |  |  | $ 1,100,000,000 | $ 50,991,000 |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  | 500,000 |  |
Rockwell Automation [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 1,000,000,000 |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 10,582,010 |  |  |  |
Sale of Stock, Price Per Share |  | $ 94.50 |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchases of common stock, shares |  |  |  | 9,392,000 | 946,000 |
Repurchases of common stock, value |  |  |  | $ 93,000 | $ 10,000 |
Rockwell Automation Deal [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 1,000,000,000 |  |  |  |
initial [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 800,000,000 |  |  |  |  |
cash from operating activities [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  |  |  | $ 100,000,000
Scenario, Forecast [Member] | final settlement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 200,000,000 |  |  |
Scenario, Forecast [Member] | total share repurchased value [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 1,000,000,000 |  |  |

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