Property And Equipment (Components Of Property And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Property, Plant and Equipment [Line Items]
Document Fiscal Year Focus	2016
Property and equipment net	$ 293,565	$ 311,387
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment net	76,289	88,273
Computers and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment net	128,815	140,636
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment net	77,712	68,114
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment net	9,126	12,741
Land and other non-depreciable assets
Property, Plant and Equipment [Line Items]
Property and equipment net	$ 1,623	$ 1,623