Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 464,153	$ 466,986
Accumulated Amortization	(179,714)	(190,322)
Net	284,439	276,664
Tax Services
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	91,745	104,685
Accumulated Amortization	(72,764)	(92,472)
Net	18,981	12,213
Tax Services | Reacquired Franchise Rights
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	214,330	214,330
Accumulated Amortization	(18,204)	(14,083)
Net	196,126	200,247
Tax Services | Customer Relationships
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	100,719	90,433
Accumulated Amortization	(48,733)	(46,504)
Net	51,986	43,929
Tax Services | Noncompete Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	23,058	22,337
Accumulated Amortization	(21,728)	(21,425)
Net	1,330	912
Tax Services | Franchise Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201
Accumulated Amortization	(5,654)	(4,373)
Net	13,547	14,828
Tax Services | Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	14,800	14,700
Accumulated Amortization	(12,331)	(10,665)
Net	2,469	4,035
Tax Services | Trade Name
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	300	1,300
Accumulated Amortization	(300)	(800)
Net	$ 0	$ 500