Property And Equipment (Components Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Property, Plant and Equipment [Line Items]
Document Fiscal Year Focus	2014
Property and equipment net	$ 304,911	$ 267,880
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment net	100,034	108,265
Computers And Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment net	139,290	112,203
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment net	51,197	38,771
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment net	9,997	4,660
Land And Other Non-Depreciable Assets
Property, Plant and Equipment [Line Items]
Property and equipment net	1,866	1,887
Construction In Process
Property, Plant and Equipment [Line Items]
Property and equipment net	$ 2,527	$ 2,094