REVENUE RECOGNITION - Summary of ASC 606 Adjustments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018	Sep. 29, 2018	Sep. 28, 2018
Assets
Prepaid expenses and other current assets	$ 20.6		$ 20.6		$ 23.5	$ 17.1
Other assets	29.8		29.8		34.5	16.5
Liabilities and Equity:
Deferred revenues	12.9		12.9		13.5	13.2
Accrued liabilities	51.7		51.7		54.6	47.5
Deferred tax liabilities	19.0		19.0		22.4	23.2
Other long-term liabilities	27.6		27.6		29.8	8.5
Retained earnings	67.7		67.7		58.9	$ 62.4
Revenues	195.8	$ 201.2	381.5	$ 377.4
Cost of revenues	131.4	131.1	257.1	245.8
Taxes (benefit) on earnings	1.9	3.4	3.0	(1.1)
Net earnings attributable to Varex	5.8	$ 12.2	8.8	$ 23.6
Adjustment Due to ASC 606 | Accounting Standards Update 2014-09
Assets
Prepaid expenses and other current assets					6.4
Other assets					18.0
Liabilities and Equity:
Deferred revenues					0.3
Accrued liabilities					7.1
Deferred tax liabilities					(0.8)
Other long-term liabilities					21.3
Retained earnings					$ (3.5)
Balance without Adoption
Assets
Prepaid expenses and other current assets	14.2		14.2
Other assets	11.9		11.9
Liabilities and Equity:
Deferred revenues	12.8		12.8
Accrued liabilities	44.6		44.6
Deferred tax liabilities	19.8		19.8
Other long-term liabilities	6.4		6.4
Retained earnings	71.0		71.0
Revenues	195.5		381.1
Cost of revenues	131.3		256.9
Taxes (benefit) on earnings	1.9		3.0
Net earnings attributable to Varex	$ 5.6		$ 8.6