GOODWILL AND INTANGIBLE ASSETS Finite-lived Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Sep. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (35.4)		$ (31.2)
Total intangible assets with finite lives	83.1		87.3
Amortization of intangible assets	4.2	$ 1.3
Intangibles assets	87.1		91.3
Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	57.0		57.0
Patents, licenses and other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	19.4		19.4
Customer contracts and supplier relationship
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	42.1		42.1
In Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 4.0		$ 4.0