Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Apr. 30, 2016	Jan. 31, 2016
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 820,609	$ 762,984	$ 784,049
Accumulated Amortization	(385,889)	(329,099)	(310,317)
Net	434,720	433,885	473,732
Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	328,321	319,354	338,242
Accumulated Amortization	(85,127)	(68,284)	(63,812)
Net	243,194	251,070	274,430
Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	216,449	206,607	201,197
Accumulated Amortization	(124,771)	(104,072)	(96,043)
Net	91,678	102,535	105,154
Software and Software Development Costs [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	142,571	131,161	126,980
Accumulated Amortization	(108,047)	(95,768)	(91,655)
Net	34,524	35,393	35,325
Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	31,821	31,499	34,454
Accumulated Amortization	(27,033)	(25,572)	(25,240)
Net	4,788	5,927	9,214
Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(10,454)	(9,494)	(9,174)
Net	8,747	9,707	10,027
Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	54,700	54,700	54,700
Accumulated Amortization	(30,457)	(25,909)	(24,393)
Net	24,243	28,791	30,307
Other Intangible Assets [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	27,546	462
Accumulated Amortization	0	0
Net	$ 27,546	$ 462
Tax Services [Member] | Trade Name Amortizing [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount			9,275
Accumulated Amortization			0
Net			$ 9,275