Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Apr. 30, 2014	Oct. 31, 2013
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 639,567	$ 556,816	$ 488,006
Accumulated Amortization	(225,522)	(201,194)	(191,793)
Net	414,045	355,622	296,213
Tax Services [Member] | Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	278,159	233,749	222,371
Accumulated Amortization	(33,721)	(26,136)	(20,414)
Net	244,438	207,613	201,957
Tax Services [Member] | Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	148,407	123,110	109,237
Accumulated Amortization	(66,714)	(59,521)	(53,501)
Net	81,693	63,589	55,736
Tax Services [Member] | Software and Software Development Costs [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	110,140	101,162	98,738
Accumulated Amortization	(77,925)	(72,598)	(76,517)
Net	32,215	28,564	22,221
Tax Services [Member] | Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	28,960	24,694	23,659
Accumulated Amortization	(22,774)	(22,223)	(21,898)
Net	6,186	2,471	1,761
Tax Services [Member] | Franchise Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(7,574)	(6,934)	(6,294)
Net	11,627	12,267	12,907
Tax Services [Member] | Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	54,700	54,900	14,800
Accumulated Amortization	(16,814)	(13,782)	(13,169)
Net	$ 37,886	$ 41,118	$ 1,631