SEGMENT INFORMATION - Income Statement Information (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($) segment	Jan. 01, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | segment	2
Revenues, net	$ 198.8	$ 177.1
Gross profit	64.8	57.2
Total operating expenses	50.8	51.1
Interest and other expenses, net	(10.7)	(10.8)
Income (loss) before taxes	3.3	(4.7)
Income tax expense	1.7	1.6
Net income (loss)	1.6	(6.3)
Less: Net income attributable to noncontrolling interests	0.2	0.1
Net income (loss) attributable to Varex	1.4	(6.4)
Medical
Segment Reporting Information [Line Items]
Revenues, net	155.7	139.2
Gross profit	46.0	44.1
Industrial
Segment Reporting Information [Line Items]
Revenues, net	43.1	37.9
Gross profit	$ 18.8	$ 13.1