Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Apr. 30, 2015	Jul. 31, 2014
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 689,915	$ 688,894	$ 560,331
Accumulated Amortization	(272,906)	(256,752)	(212,441)
Net	417,009	432,142	347,890
Tax Services [Member] | Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	294,918	294,647	233,749
Accumulated Amortization	(51,233)	(46,180)	(29,152)
Net	243,685	248,467	204,597
Tax Services [Member] | Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	169,998	170,851	123,130
Accumulated Amortization	(83,471)	(78,157)	(62,514)
Net	86,527	92,694	60,616
Tax Services [Member] | Software and Software Development Costs [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	120,522	118,865	104,580
Accumulated Amortization	(84,215)	(80,689)	(75,243)
Net	36,307	38,176	29,337
Tax Services [Member] | Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	30,576	30,630	24,697
Accumulated Amortization	(24,091)	(23,666)	(22,408)
Net	6,485	6,964	2,289
Tax Services [Member] | Franchise Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(8,534)	(8,214)	(7,254)
Net	10,667	10,987	11,947
Tax Services [Member] | Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	54,700	54,700	54,974
Accumulated Amortization	(21,362)	(19,846)	(15,870)
Net	$ 33,338	$ 34,854	$ 39,104