Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 354,371	$ 360,636
Accumulated Amortization	(92,265)	(85,294)
Net	262,106	275,342
Tax Services [Member] | Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	81,428	87,624
Accumulated Amortization	(43,730)	(41,076)
Net	37,698	46,548
Tax Services [Member] | Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	23,387	23,456
Accumulated Amortization	(22,445)	(22,059)
Net	942	1,397
Tax Services [Member] | Reacquired Franchise Rights [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	214,330	214,330
Accumulated Amortization	(12,022)	(9,961)
Net	202,308	204,369
Tax Services [Member] | Franchise Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201
Accumulated Amortization	(3,733)	(3,093)
Net	15,468	16,108
Tax Services [Member] | Purchased Technology [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	14,700	14,700
Accumulated Amortization	(9,635)	(8,505)
Net	5,065	6,195
Tax Services [Member] | Trade Name - Amortizing [Member]
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	1,325	1,325
Accumulated Amortization	(700)	(600)
Net	$ 625	$ 725