OTHER FINANCIAL INFORMATION - Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 03, 2020	Dec. 28, 2018
Other Financial Information [Abstract]
Gain on equity investments	$ 1.4	$ 22.0
Net foreign currency exchange gain	2.4	1.3
Other income (loss)	0.6	(0.3)
Total other income, net	$ 4.4	$ 23.0