Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Apr. 30, 2014	Jan. 31, 2014
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 682,539	$ 556,816	$ 511,316
Accumulated Amortization	(239,210)	(201,194)	(192,597)
Net	443,329	355,622	318,719
Tax Services [Member] | Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	294,587	233,749	233,675
Accumulated Amortization	(39,954)	(26,136)	(23,120)
Net	254,633	207,613	210,555
Tax Services [Member] | Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	169,058	123,110	121,055
Accumulated Amortization	(71,799)	(59,521)	(56,283)
Net	97,259	63,589	64,772
Tax Services [Member] | Software and Software Development Costs [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	114,447	101,162	98,012
Accumulated Amortization	(78,063)	(72,598)	(70,964)
Net	36,384	28,564	27,048
Tax Services [Member] | Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	30,546	24,694	24,573
Accumulated Amortization	(23,171)	(22,223)	(22,028)
Net	7,375	2,471	2,545
Tax Services [Member] | Franchise Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(7,894)	(6,934)	(6,614)
Net	11,307	12,267	12,587
Tax Services [Member] | Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	54,700	54,900	14,800
Accumulated Amortization	(18,329)	(13,782)	(13,588)
Net	$ 36,371	$ 41,118	$ 1,212