NET (LOSS) EARNINGS PER SHARE - Reconciliation of Numerator and Denominator for Basic and Diluted Net (Loss) Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Earnings Per Share [Abstract]
Net (loss) earnings attributable to Varex	$ (28.3)	$ (1.4)	$ (31.5)	$ 7.4
Weighted average common shares outstanding - basic (in shares)	39.0	38.3	38.7	38.2
Dilutive effect of potential common shares (in shares)	0.0	0.0	0.0	0.2
Weighted average common shares outstanding - diluted (in shares)	39.0	38.3	38.7	38.4
Net (loss) earnings per share attributable to Varex - basic (in USD per share)	$ (0.73)	$ (0.04)	$ (0.81)	$ 0.19
Net (loss) earnings per share attributable to Varex - diluted (in USD per share)	$ (0.73)	$ (0.04)	$ (0.81)	$ 0.19
Anti-dilutive employee shared based awards, excluded (in shares)	3.2	2.4	3.0	2.0