GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) office	Jan. 31, 2019 USD ($)
Business Acquisition [Line Items]
Payments to acquire franchisee and competitor businesses			$ 450,282	$ 42,428
Number of acquired offices | office			224
Amortization	$ 21,500	$ 18,700	$ 61,300	$ 54,500
Estimated amortization, 2020	83,000		83,000
Estimated amortization, 2021	75,000		75,000
Estimated amortization, 2022	58,900		58,900
Estimated amortization, 2023	41,300		41,300
Estimated amortization, 2024	$ 30,800		30,800
Franchisee and competitor businesses
Business Acquisition [Line Items]
Payments to acquire franchisee and competitor businesses		$ 42,400	$ 53,700