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RELATED-PARTY TRANSACTIONS - Investment in Privately Held Companies (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Oct. 01, 2021	Dec. 31, 2021	Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Related Party Transaction [Line Items]
Loss from equity method investments				$ (3.4)	$ (2.1)	$ (2.3)
Equity method investments		$ 3.0		3.0	2.5
Contributions to equity method investments				$ 1.4	1.8	3.9
Equity Method Investee \| dpiX Holding
Related Party Transaction [Line Items]
Percentage of manufacturing capacity				50.00%
Equity Method Investee \| dpiX LLC
Related Party Transaction [Line Items]
Equity method investment, ownership percentage		100.00%		100.00%
dpiX Holding
Related Party Transaction [Line Items]
Loss from equity method investments				$ (2.3)	(0.8)	(1.1)
Equity method investments		$ 45.0		$ 45.0	47.3
dpiX Holding \| Equity Method Investee
Related Party Transaction [Line Items]
Equity method investment, ownership percentage		40.00%		40.00%
Purchases from related party				$ 18.5	20.4	23.5
Accounts payable, related parties		$ 2.8		$ 2.8	4.6
Percentage of fixed costs				50.00%
VEC Imaging
Related Party Transaction [Line Items]
Contributions to equity method investments		1.2		$ 5.1
Due to related parties		$ 0.3		0.3
VEC Imaging \| Equity Method Investee
Related Party Transaction [Line Items]
Loss from equity method investments				$ (1.1)	$ (1.2)	$ (0.9)
CETTEEN GmbH \| VEC Imaging
Related Party Transaction [Line Items]
Equity method investment, ownership percentage		50.00%		50.00%
Forecast \| Fixed Cost Commitments \| dpiX Holding
Related Party Transaction [Line Items]
Related party transaction, expected fixed cost	$ 2.9		$ 11.6