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GOODWILL AND INTANGIBLE ASSETS (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Apr. 30, 2021
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,036,196 $ 1,031,841
Accumulated Amortization (685,103) (671,693)
Net 351,093 360,148
Reacquired franchise rights    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 370,405 370,112
Accumulated Amortization (182,366) (179,356)
Net 188,039 190,756
Customer relationships    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 316,547 316,508
Accumulated Amortization (255,294) (251,160)
Net 61,253 65,348
Internally-developed software    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 160,315 156,308
Accumulated Amortization (119,460) (116,126)
Net 40,855 40,182
Noncompete agreements    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 41,228 41,212
Accumulated Amortization (35,802) (35,484)
Net 5,426 5,728
Franchise agreements    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 19,201 19,201
Accumulated Amortization (16,108) (15,894)
Net 3,093 3,307
Purchased technology    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 122,700 122,700
Accumulated Amortization (74,913) (72,609)
Net 47,787 50,091
Trade name    
Goodwill and Intangible Assets [Line Items]    
Gross Carrying Amount 5,800 5,800
Accumulated Amortization (1,160) (1,064)
Net $ 4,640 $ 4,736