Property And Equipment (Components Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Property, Plant and Equipment [Line Items]
Document Fiscal Year Focus	2015
Property and equipment net	$ 311,387	$ 304,911
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment net	88,273	100,034
Computers and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment net	140,636	139,290
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment net	68,114	51,197
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment net	12,741	9,997
Land and other non-depreciable assets
Property, Plant and Equipment [Line Items]
Property and equipment net	$ 1,623	$ 4,393