SEGMENT INFORMATION - Summary of Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Segment Reporting Information [Line Items]
Revenues, net	$ 818.1	$ 738.3	$ 780.6
Gross profit	271.5	190.2	256.7
Total operating expenses	197.4	223.9	211.0
Interest and other expense, net	(45.5)	(38.9)	(24.2)
Income (loss) before taxes	28.6	(72.6)	21.5
Income tax expense (benefit)	10.7	(15.2)	5.7
Net income (loss)	17.9	(57.4)	15.8
Less: Net income attributable to noncontrolling interests	0.5	0.5	0.3
Net income (loss) attributable to Varex	17.4	(57.9)	15.5
Medical
Segment Reporting Information [Line Items]
Revenues, net	643.8	584.5	596.8
Gross profit	203.2	136.4	188.9
Industrial
Segment Reporting Information [Line Items]
Revenues, net	174.3	153.8	183.8
Gross profit	$ 68.3	$ 53.8	$ 67.8