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GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jan. 31, 2019
Business Acquisition [Line Items]      
Payments made for business acquisitions, net of cash acquired $ 13 $ 394,411  
Amortization 20,900 $ 18,200  
Estimated amortization, 2021 76,100    
Estimated amortization, 2022 59,800    
Estimated amortization, 2023 41,900    
Estimated amortization, 2024 31,000    
Estimated amortization, 2025 17,900    
Franchisee and competitor businesses      
Business Acquisition [Line Items]      
Payments made for business acquisitions, net of cash acquired $ 13   $ 394,400