OTHER FINANCIAL INFORMATION - Unbilled Receivables and Deferred Revenues from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019	Sep. 27, 2019
Other Financial Information [Abstract]
Unbilled receivables - current	$ 320.1		$ 320.1		$ 346.7
Unbilled receivables - long-term	72.1		72.1		35.1
Deferred revenues - current	(778.4)		(778.4)		(766.0)
Deferred revenues - long-term	(70.8)		(70.8)		(73.1)
Total net unbilled receivables (deferred revenues)	(457.0)		(457.0)		$ (457.3)
Decrease in unbilled receivables			(10.4)
Increase in deferred revenue			10.1
Recognized revenue included in deferred revenue balance	$ 109.7	$ 113.9	$ 586.6	$ 545.1