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