Goodwill And Intangible Assets Intangible Assets Acquired (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Acquired	$ 115,204	$ 30,300
Weighted-Average Life (in years)	5 years
Reacquired franchise rights
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Acquired	60,906
Weighted-Average Life (in years)	6 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Acquired	48,298
Weighted-Average Life (in years)	6 years
Noncompete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Amount Acquired	$ 6,000
Weighted-Average Life (in years)	5 years