Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Apr. 30, 2016	Oct. 31, 2015
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 799,775	$ 762,984	$ 756,749
Accumulated Amortization	(366,640)	(329,099)	(290,525)
Net	433,135	433,885	466,224
Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	322,916	319,354	316,142
Accumulated Amortization	(79,484)	(68,284)	(56,731)
Net	243,432	251,070	259,411
Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	211,106	206,607	182,137
Accumulated Amortization	(117,539)	(104,072)	(89,340)
Net	93,567	102,535	92,797
Software and Software Development Costs [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	137,533	131,161	123,263
Accumulated Amortization	(104,022)	(95,768)	(88,091)
Net	33,511	35,393	35,172
Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	31,625	31,499	32,428
Accumulated Amortization	(26,520)	(25,572)	(24,632)
Net	5,105	5,927	7,796
Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(10,134)	(9,494)	(8,854)
Net	9,067	9,707	10,347
Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	54,700	54,700	54,700
Accumulated Amortization	(28,941)	(25,909)	(22,877)
Net	25,759	28,791	31,823
Other Intangible Assets [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	22,694	462
Accumulated Amortization	0	0
Net	$ 22,694	$ 462
Tax Services [Member] | Trade Name Amortizing [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount			28,878
Accumulated Amortization			0
Net			$ 28,878