SEGMENT INFORMATION - Income Statement Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 03, 2020 USD ($)	Mar. 29, 2019 USD ($)	Apr. 03, 2020 USD ($) segment	Mar. 29, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | segment			2
Revenues, net	$ 197.0	$ 195.8	$ 397.1	$ 381.5
Gross margin	57.6	64.4	118.7	124.4
Total operating expenses	56.2	49.9	112.7	99.5
Interest and other income (expenses), net	(2.5)	(6.7)	(8.3)	(13.0)
Earnings before taxes	(1.1)	7.8	(2.3)	11.9
Taxes on earnings	0.7	1.9	0.7	3.0
Net (loss) earnings	(1.8)	5.9	(3.0)	8.9
Less: Net earnings attributable to noncontrolling interests	0.1	0.1	0.2	0.1
Net (loss) earnings attributable to Varex	(1.9)	5.8	(3.2)	8.8
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues, net	155.4	148.9	311.0	292.8
Gross margin	43.2	46.1	87.2	91.2
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Revenues, net	41.6	46.9	86.1	88.7
Gross margin	$ 14.4	$ 18.3	$ 31.5	$ 33.2