SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adjustments from Amounts Previously Reported (Details) $ in Millions	9 Months Ended
	Jun. 28, 2019 USD ($) specialty_hospital cancer_center healthcare_facility	Jun. 29, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of healthcare facilities operated in India | healthcare_facility	11
Number of specialty hospitals operated in India | specialty_hospital	1
Number of cancer centers operated in India | cancer_center	10
Cash used in investing activities	$ (523.7)	$ (103.1)
Cash, cash equivalents, and restricted cash at beginning of period	516.4	718.5
Cash, cash equivalents, and restricted cash at end of period	$ 542.9	545.1
Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash used in investing activities		6.8
Cash, cash equivalents, and restricted cash at beginning of period		2.3
Cash, cash equivalents, and restricted cash at end of period		9.1
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash used in investing activities		(109.9)
Cash, cash equivalents, and restricted cash at beginning of period		716.2
Cash, cash equivalents, and restricted cash at end of period		$ 536.0