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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adjustments from Amounts Previously Reported (Details)
 3 Months Ended
Jan. 03, 2020
cancer_center
specialty_hospital
India  
Segment Reporting Information [Line Items]  
Number of cancer centers 10
Number of specialty hospitals | specialty_hospital 1
Sri Lanka  
Segment Reporting Information [Line Items]  
Number of cancer centers 1