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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revision of Prior Period Statement of Equity (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 03, 2025
Sep. 27, 2024
Sep. 29, 2023
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance $ 543.2 $ 576.1 $ 542.6
Net (loss) income (69.9) (48.3) 47.9
Stockholders' equity, outstanding, ending balance 486.6 543.2 576.1
As Previously Reported      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance 549.2 581.0 546.7
Net (loss) income   (47.2) 48.7
Stockholders' equity, outstanding, ending balance   549.2 581.0
Revision      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance (6.0) (4.9) (4.1)
Net (loss) income   (1.1) (0.8)
Stockholders' equity, outstanding, ending balance   (6.0) (4.9)
Accumulated Deficit      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance 64.4 113.2 59.7
Net (loss) income (70.3) (48.8) 47.4
Stockholders' equity, outstanding, ending balance (5.9) 64.4 113.2
Accumulated Deficit | As Previously Reported      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance 70.4 118.1 63.8
Net (loss) income   (47.7) 48.2
Stockholders' equity, outstanding, ending balance   70.4 118.1
Accumulated Deficit | Revision      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance (6.0) (4.9) (4.1)
Net (loss) income   (1.1) (0.8)
Stockholders' equity, outstanding, ending balance   (6.0) (4.9)
Total Varex Equity      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance 529.1 562.8 529.3
Net (loss) income (70.3) (48.8) 47.4
Stockholders' equity, outstanding, ending balance 472.6 529.1 562.8
Total Varex Equity | As Previously Reported      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance 535.1 567.7 533.4
Net (loss) income   (47.7) 48.2
Stockholders' equity, outstanding, ending balance   535.1 567.7
Total Varex Equity | Revision      
Increase (Decrease) in Stockholders' Equity      
Stockholders' equity, outstanding, beginning balance $ (6.0) (4.9) (4.1)
Net (loss) income   (1.1) (0.8)
Stockholders' equity, outstanding, ending balance   $ (6.0) $ (4.9)