Property And Equipment (Components Of Property And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Property, Plant and Equipment [Line Items]
Document Fiscal Year Focus	2017
Property and equipment net	$ 263,827	$ 293,565
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment net	69,904	76,289
Computers and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment net	111,618	128,815
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment net	74,112	77,712
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment net	6,570	9,126
Land and other non-depreciable assets
Property, Plant and Equipment [Line Items]
Property and equipment net	$ 1,623	$ 1,623