Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 511,616	$ 464,153	$ 469,190
Accumulated Amortization	(192,897)	(179,714)	(180,952)
Net	318,719	284,439	288,238
Tax Services
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	98,012	91,745	87,909
Accumulated Amortization	(70,964)	(72,764)	(71,194)
Net	27,048	18,981	16,715
Tax Services | Reacquired Franchise Rights
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	233,675	214,330	214,330
Accumulated Amortization	(23,120)	(18,204)	(17,174)
Net	210,555	196,126	197,156
Tax Services | Customer Relationships
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	121,055	100,719	108,596
Accumulated Amortization	(56,283)	(48,733)	(52,820)
Net	64,772	51,986	55,776
Tax Services | Noncompete Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	24,573	23,058	23,054
Accumulated Amortization	(22,028)	(21,728)	(21,627)
Net	2,545	1,330	1,427
Tax Services | Franchise Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(6,614)	(5,654)	(5,334)
Net	12,587	13,547	13,867
Tax Services | Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	14,800	14,800	14,800
Accumulated Amortization	(13,588)	(12,331)	(11,911)
Net	1,212	2,469	2,889
Tax Services | Trade Name
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	300	300	1,300
Accumulated Amortization	(300)	(300)	(892)
Net	$ 0	$ 0	$ 408