Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Apr. 30, 2011
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 363,636	$ 360,636
Accumulated Amortization	(95,488)	(85,294)
Net	268,148	275,342
Tax Services [Member] | Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	90,355	87,624
Accumulated Amortization	(44,805)	(41,076)
Net	45,550	46,548
Tax Services [Member] | Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	23,725	23,456
Accumulated Amortization	(22,628)	(22,059)
Net	1,097	1,397
Tax Services [Member] | Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	214,330	214,330
Accumulated Amortization	(13,052)	(9,961)
Net	201,278	204,369
Tax Services [Member] | Franchise Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201
Accumulated Amortization	(4,053)	(3,093)
Net	15,148	16,108
Tax Services [Member] | Purchased Technology [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	14,700	14,700
Accumulated Amortization	(10,200)	(8,505)
Net	4,500	6,195
Tax Services [Member] | Trade Name [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	1,325	1,325
Accumulated Amortization	(750)	(600)
Net	$ 575	$ 725