SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Assets Acquired, Net of Liabilities Assumed) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 28, 2019	Jan. 31, 2020	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018
Business Acquisition [Line Items]
Goodwill		$ 838,830	$ 519,937	$ 520,005	$ 507,871
Weighted-Average Life (in years)		4 years
Customer relationships
Business Acquisition [Line Items]
Weighted-Average Life (in years)		5 years
Noncompete agreements
Business Acquisition [Line Items]
Weighted-Average Life (in years)		5 years
Wave
Business Acquisition [Line Items]
Assets acquired and liabilities assumed, net	$ 3,928
Deferred tax liability	(8,126)
Total identifiable net assets	99,672
Goodwill	300,560
Total identifiable assets and goodwill	400,232
Wave | Purchased technology
Business Acquisition [Line Items]
Acquired intangible assets	$ 68,000
Weighted-Average Life (in years)	10 years
Wave | Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets	$ 23,000
Weighted-Average Life (in years)	5 years
Wave | Noncompete agreements
Business Acquisition [Line Items]
Acquired intangible assets	$ 7,070
Weighted-Average Life (in years)	5 years
Wave | Trade name
Business Acquisition [Line Items]
Acquired intangible assets	$ 5,800
Weighted-Average Life (in years)	10 years