Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Goodwill and Intangible Assets [Line Items]
Document Fiscal Year Focus	2016
Gross Carrying Amount	$ 762,984	$ 688,894
Accumulated Amortization	(329,099)	(256,752)
Net	433,885	432,142
Reacquired franchise rights
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	319,354	294,647
Accumulated Amortization	(68,284)	(46,180)
Net	251,070	248,467
Customer relationships
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	206,607	170,851
Accumulated Amortization	(104,072)	(78,157)
Net	102,535	92,694
Computer Software, Intangible Asset [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	131,161	118,865
Accumulated Amortization	(95,768)	(80,689)
Net	35,393	38,176
Noncompete agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	31,499	30,630
Accumulated Amortization	(25,572)	(23,666)
Net	5,927	6,964
Franchise agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201
Accumulated Amortization	(9,494)	(8,214)
Net	9,707	10,987
Purchased technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	54,700	54,700
Accumulated Amortization	(25,909)	(19,846)
Net	28,791	34,854
Trade Name
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	462	0
Accumulated Amortization	0	0
Net	$ 462	$ 0