Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	12 Months Ended
	Oct. 02, 2020 USD ($)
Goodwill [Roll Forward]
Balance September 27, 2019	$ 5,432,544
Acquired	206,000
Post-Acquisition Adjustments	2,000
Disposed	(6,000)
Foreign Exchange Impact	4,000
Balance October 2, 2020	5,639,091
Critical Mission Solutions
Goodwill [Roll Forward]
Balance September 27, 2019	2,202,000
Acquired	206,000
Post-Acquisition Adjustments	2,000
Disposed	0
Foreign Exchange Impact	(1,000)
Balance October 2, 2020	2,409,000
People & Places Solutions
Goodwill [Roll Forward]
Balance September 27, 2019	3,231,000
Acquired	0
Post-Acquisition Adjustments	0
Disposed	(6,000)
Foreign Exchange Impact	5,000
Balance October 2, 2020	$ 3,230,000