CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Varex Equity	Noncontrolling Interests
Common stock, shares, outstanding, beginning balance (in shares) at Sep. 28, 2018		38,000,000.0
Stockholders' equity, beginning balance at Sep. 28, 2018	$ 428.3	$ 0.4	$ 357.6	$ 5.8	$ 62.4	$ 426.2	$ 2.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	8.6				8.8	8.8	(0.2)
Exercise of stock options	0.1		0.1			0.1
Common stock issued upon vesting of restricted shares (in shares)		200,000
Shares withheld on vesting of restricted stock (in shares)		(100,000)
Shares withheld on vesting of restricted stock	(2.1)		(2.1)			(2.1)
Common stock issued under employee stock purchase plan (in shares)		100,000
Common stock issued under employee stock purchase plan	1.9		1.9			1.9
Share-based compensation	5.6		5.6			5.6
Unrealized loss on interest rate swap contracts, net of tax	(3.7)			(3.7)		(3.7)
Common stock, shares, outstanding, ending balance (in shares) at Mar. 29, 2019		38,200,000
Stockholders' equity, ending balance at Mar. 29, 2019	435.2	$ 0.4	363.1	2.1	67.7	433.3	1.9
Common stock, shares, outstanding, beginning balance (in shares) at Dec. 28, 2018		38,100,000
Stockholders' equity, beginning balance at Dec. 28, 2018	429.2	$ 0.4	362.1	3.5	61.3	427.3	1.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	5.8				5.8	5.8
Exercise of stock options	0.1		0.1			0.1
Common stock issued upon vesting of restricted shares (in shares)		200,000
Common stock issued upon vesting of restricted shares	0.0
Shares withheld on vesting of restricted stock (in shares)		(100,000)
Shares withheld on vesting of restricted stock	(2.1)		(2.1)			(2.1)
Share-based compensation	3.0		3.0			3.0
Unrealized loss on interest rate swap contracts, net of tax	(1.4)			(1.4)		(1.4)
Common stock, shares, outstanding, ending balance (in shares) at Mar. 29, 2019		38,200,000
Stockholders' equity, ending balance at Mar. 29, 2019	$ 435.2	$ 0.4	363.1	2.1	67.7	433.3	1.9
Common stock, shares, outstanding, beginning balance (in shares) at Sep. 27, 2019	38,371,305	38,400,000
Stockholders' equity, beginning balance at Sep. 27, 2019	$ 448.2	$ 0.4	371.8	(1.7)	74.4	444.9	3.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (3.3)				(3.2)	(3.2)	(0.1)
Exercises of stock options (in shares)	64,000	100,000
Exercise of stock options	$ 1.5		1.5			1.5
Common stock issued upon vesting of restricted shares (in shares)		200,000
Common stock issued upon vesting of restricted shares	0.0
Shares withheld on vesting of restricted stock (in shares)		(100,000)
Shares withheld on vesting of restricted stock	(1.8)		(1.8)			(1.8)
Common stock issued under employee stock purchase plan (in shares)		100,000
Common stock issued under employee stock purchase plan	1.8		1.8			1.8
Share-based compensation	6.5		6.5			6.5
Unrealized loss on interest rate swap contracts, net of tax	(2.3)			(2.3)		(2.3)
Currency translation adjustments	4.3			4.3		4.3
Other	$ (0.3)		(0.3)			(0.3)
Common stock, shares, outstanding, ending balance (in shares) at Apr. 03, 2020	38,653,547	38,700,000
Stockholders' equity, ending balance at Apr. 03, 2020	$ 454.3	$ 0.4	379.5	0.3	70.9	451.1	3.2
Common stock, shares, outstanding, beginning balance (in shares) at Jan. 03, 2020		38,500,000
Stockholders' equity, beginning balance at Jan. 03, 2020	451.2	$ 0.4	377.6	(2.6)	72.5	447.9	3.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2.0)				(1.9)	(1.9)	(0.1)
Exercise of stock options	0.3		0.3			0.3
Common stock issued upon vesting of restricted shares (in shares)		200,000
Common stock issued upon vesting of restricted shares	0.0
Shares withheld on vesting of restricted stock	(1.7)		(1.7)			(1.7)
Share-based compensation	3.3		3.3			3.3
Unrealized loss on interest rate swap contracts, net of tax	(2.3)			(2.3)		(2.3)
Currency translation adjustments	$ 5.2			5.2		5.2
Common stock, shares, outstanding, ending balance (in shares) at Apr. 03, 2020	38,653,547	38,700,000
Stockholders' equity, ending balance at Apr. 03, 2020	$ 454.3	$ 0.4	$ 379.5	$ 0.3	$ 70.9	$ 451.1	$ 3.2