BUSINESS COMBINATIONS (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 28, 2019	Jun. 28, 2019	Dec. 28, 2018	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Business Acquisition [Line Items]
Goodwill acquired					$ 326,900,000
Measurement period adjustment to reduce FV of purchase price consideration			$ (9,600,000)
Measurement period adjustment to decrease fair value of the contingent consideration liability			11,900,000
Measurement period adjustment to decrease finite-lived intangible assets			(5,400,000)
Measurement period adjustment to decrease goodwill		$ 2,600,000	$ (4,700,000)		(2,100,000)
Acquisition-related expenses		10,400,000		$ 12,700,000	15,000,000.0	$ 33,900,000
Cancer Treatment Services International
Business Acquisition [Line Items]
Acquisition purchase price	$ 279,300,000
Cash consideration	262,800,000
Contingent consideration	8,200,000	8,200,000			8,200,000
Other consideration	8,300,000
Undiscounted range of contingent consideration payments, low	0
Undiscounted range of contingent consideration payments, high	$ 58,000,000
Revenue projection period for consideration payments	18 months
Intangible assets	$ 117,000,000.0	117,000,000.0			117,000,000.0
Goodwill expected to be deductible for tax purposes	0	0			0
Endocare and Alicon
Business Acquisition [Line Items]
Acquisition purchase price	209,400,000
Cash consideration	196,800,000
Contingent consideration	12,600,000	12,600,000			12,600,000
Undiscounted range of contingent consideration payments, low	0
Undiscounted range of contingent consideration payments, high	40,000,000
Intangible assets	61,100,000	61,100,000			61,100,000
Goodwill expected to be deductible for tax purposes	0	0			0
Privately-held Company
Business Acquisition [Line Items]
Asset acquisition purchase price		15,200,000
Asset acquisition, holdback amount		3,600,000
Asset acquisition, fair value of contingent consideration	0	0			0
Asset acquisition, potential maximum payout of contingent consideration		9,000,000
Privately-held Software Company
Business Acquisition [Line Items]
Acquisition purchase price					28,500,000
Goodwill acquired					22,000,000.0
Intangible assets	$ 6,500,000	6,500,000			$ 6,500,000
Acquisition-related Expenses
Business Acquisition [Line Items]
IPR&D expensed		$ 20,800,000