Technology, Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Property, Plant and Equipment [Line Items]
Technology, Property and Equipment, gross	$ 665,116	$ 688,701
Accumulated Depreciation and Amortization	(367,111)	(399,680)
Total	298,005	289,021	$ 289,934
Net book value of capitalized software costs	207,500	200,200
Capitalized Software Amortization Expense	55,685	50,095	45,449
Depreciation and Amortization Expense, Excluding Capitalized Software	21,031	19,323	18,878
Total Depreciation and Amortization Expense for Technology, Property and Equipment	76,716	69,418	$ 64,327
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Technology, Property and Equipment, gross	471,844	440,437
Work in process	900	2,300
Computer Hardware [Member]
Property, Plant and Equipment [Line Items]
Technology, Property and Equipment, gross	46,640	68,718
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Technology, Property and Equipment, gross	99,230	118,685
Furniture, Fixtures and Warehouse Equipment [Member]
Property, Plant and Equipment [Line Items]
Technology, Property and Equipment, gross	44,104	57,471
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Technology, Property and Equipment, gross	$ 3,298	$ 3,390