OTHER FINANCIAL INFORMATION - Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Other Financial Information [Abstract]
Gain on equity investments	$ 2.0	$ 0.0	$ 23.8	$ 0.0
Net foreign currency exchange gain	1.8	0.8	2.6	1.0
Other	0.4	0.7	1.0	1.9
Total other income, net	$ 4.2	$ 1.5	$ 27.4	$ 2.9