CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Total Varex Equity	Total Varex Equity Cumulative Effect, Period of Adoption, Adjustment	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	$ (3.5)	$ 0.4	$ 357.6	$ 5.8	$ 62.4	$ (3.5)	$ 426.2	$ (3.5)	$ 2.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	7.2					7.4		7.4		(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)			200,000
Common stock issued under employee stock purchase plan	3.8			3.8				3.8
Share-based compensation	8.7			8.7				8.7
Unrealized loss on interest rate swap contracts, net of tax	(6.0)				(6.0)			(6.0)
Currency translation adjustments	(0.2)				(0.2)			(0.2)
Noncontrolling interest acquired / consolidated	1.4									1.4
Common stock, shares, outstanding, ending balance (in shares) at Jun. 28, 2019			38,300,000
Stockholders' equity, ending balance at Jun. 28, 2019	437.7		$ 0.4	368.1	(0.4)	66.3		434.4		3.3
Common stock, shares, outstanding, beginning balance (in shares) at Mar. 29, 2019			38,200,000
Stockholders' equity, beginning balance at Mar. 29, 2019	435.2		$ 0.4	363.1	2.1	67.7		433.3		1.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	(1.4)					(1.4)		(1.4)
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	3.1			3.1				3.1
Unrealized loss on interest rate swap contracts, net of tax	(2.3)				(2.3)			(2.3)
Currency translation adjustments	(0.2)				(0.2)			(0.2)
Noncontrolling interest acquired / consolidated	1.4									1.4
Common stock, shares, outstanding, ending balance (in shares) at Jun. 28, 2019			38,300,000
Stockholders' equity, ending balance at Jun. 28, 2019	$ 437.7		$ 0.4	368.1	(0.4)	66.3		434.4		3.3
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	$ (0.3)	$ 0.4	371.8	(1.7)	74.4	$ (0.3)	444.9	$ (0.3)	3.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	$ (31.6)					(31.5)		(31.5)		(0.1)
Exercise 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)			200,000
Common stock issued under employee stock purchase plan	3.6			3.6				3.6
Share-based compensation	10.2			10.2				10.2
Unrealized loss on interest rate swap contracts, net of tax	(2.0)				(2.0)			(2.0)
Conversion feature of Convertible Notes, net of issuance costs	46.1			46.1				46.1
Purchase of hedges	(61.0)			(61.0)	0.0			(61.0)
Issuance of warrants	49.8			49.8				49.8
Currency translation adjustments	0.6				0.6			0.6
Shares issued to settle deferred consideration (in shares)			300,000
Shares issued to settle deferred consideration	7.4			7.4				7.4
Other	$ (0.4)			(0.4)				(0.4)
Common stock, shares, outstanding, ending balance (in shares) at Jul. 03, 2020	39,056,965		39,100,000
Stockholders' equity, ending balance at Jul. 03, 2020	$ 470.3		$ 0.4	427.2	(3.1)	42.6		467.1		3.2
Common stock, shares, outstanding, beginning balance (in shares) at Apr. 03, 2020			38,700,000
Stockholders' equity, beginning balance at Apr. 03, 2020	454.3		$ 0.4	379.5	0.3	70.9		451.1		3.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	(28.3)					(28.3)		(28.3)
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	3.7			3.7				3.7
Unrealized loss on interest rate swap contracts, net of tax	0.3				0.3			0.3
Conversion feature of Convertible Notes, net of issuance costs	46.1			46.1				46.1
Purchase of hedges	(61.0)			(61.0)				(61.0)
Issuance of warrants	49.8			49.8				49.8
Currency translation adjustments	(3.7)				(3.7)			(3.7)
Shares issued to settle deferred consideration (in shares)			300,000
Shares issued to settle deferred consideration	7.4			7.4				7.4
Other	$ (0.1)			(0.1)				(0.1)
Common stock, shares, outstanding, ending balance (in shares) at Jul. 03, 2020	39,056,965		39,100,000
Stockholders' equity, ending balance at Jul. 03, 2020	$ 470.3		$ 0.4	$ 427.2	$ (3.1)	$ 42.6		$ 467.1		$ 3.2