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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revision of Prior Period Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 03, 2025
Sep. 27, 2024
Sep. 29, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Income tax expense (benefit) $ 10.7 $ 53.3 $ (16.6)
Net (loss) income (69.9) (48.3) 47.9
Net income attributable to Varex - basic $ (70.3) $ (48.8) $ 47.4
Net (loss) income per common share attributable to Varex      
Basic net income per share attributable to Varex (in USD per share) $ (1.70) $ (1.20) $ 1.18
Diluted net income per share attributable to Varex (in USD per share) $ (1.70) $ (1.20) $ 1.07
As Previously Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Income tax expense (benefit)   $ 52.2 $ (17.4)
Net (loss) income   (47.2) 48.7
Net income attributable to Varex - basic   $ (47.7) $ 48.2
Net (loss) income per common share attributable to Varex      
Basic net income per share attributable to Varex (in USD per share)   $ (1.17) $ 1.20
Diluted net income per share attributable to Varex (in USD per share)   $ (1.17) $ 1.08
Revision      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Income tax expense (benefit)   $ 1.1 $ 0.8
Net (loss) income   (1.1) (0.8)
Net income attributable to Varex - basic   $ (1.1) $ (0.8)
Net (loss) income per common share attributable to Varex      
Basic net income per share attributable to Varex (in USD per share)   $ (0.03) $ (0.02)
Diluted net income per share attributable to Varex (in USD per share)   $ (0.03) $ (0.01)