Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 362,301	$ 360,636
Accumulated Amortization	(97,850)	(85,294)
Net	264,451	275,342
Tax Services [Member] | Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	90,433	87,624
Accumulated Amortization	(46,504)	(41,076)
Net	43,929	46,548
Tax Services [Member] | Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	22,337	23,456
Accumulated Amortization	(21,425)	(22,059)
Net	912	1,397
Tax Services [Member] | Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	214,330	214,330
Accumulated Amortization	(14,083)	(9,961)
Net	200,247	204,369
Tax Services [Member] | Franchise Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201
Accumulated Amortization	(4,373)	(3,093)
Net	14,828	16,108
Tax Services [Member] | Purchased Technology [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	14,700	14,700
Accumulated Amortization	(10,665)	(8,505)
Net	4,035	6,195
Tax Services [Member] | Trade Name [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	1,300	1,325
Accumulated Amortization	(800)	(600)
Net	$ 500	$ 725