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GOODWILL AND INTANGIBLE ASSETS - Activity of Goodwill by Reportable Operating Segment (Detail)
$ in Millions
9 Months Ended
Jun. 29, 2018
USD ($)
Goodwill [Roll Forward]  
Balance, beginning $ 222.6
Business combinations 17.9
Foreign currency translation adjustments (0.6)
Balance, ending 239.9
Oncology Systems  
Goodwill [Roll Forward]  
Balance, beginning 170.2
Business combinations 17.9
Foreign currency translation adjustments 0.0
Balance, ending 188.1
Varian Particle Therapy  
Goodwill [Roll Forward]  
Balance, beginning 52.4
Business combinations 0.0
Foreign currency translation adjustments (0.6)
Balance, ending $ 51.8