Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands	Jul. 31, 2011	Apr. 30, 2011
Gross Carrying Amount	$ 608,310	$ 614,399
Accumulated Amortization	(248,275)	(246,480)
Net	360,035	367,919
Tax Services [Member] | Customer Relationships [Member]
Gross Carrying Amount	86,678	87,624
Accumulated Amortization	(43,031)	(41,076)
Net	43,647	46,548
Tax Services [Member] | Noncompete Agreements [Member]
Gross Carrying Amount	23,451	23,456
Accumulated Amortization	(22,278)	(22,059)
Net	1,173	1,397
Tax Services [Member] | Reacquired Franchise Rights [Member]
Gross Carrying Amount	214,330	214,330
Accumulated Amortization	(10,991)	(9,961)
Net	203,339	204,369
Tax Services [Member] | Franchise Agreements [Member]
Gross Carrying Amount	19,201	19,201
Accumulated Amortization	(3,414)	(3,093)
Net	15,787	16,108
Tax Services [Member] | Purchased Technology [Member]
Gross Carrying Amount	14,700	14,700
Accumulated Amortization	(9,070)	(8,505)
Net	5,630	6,195
Tax Services [Member] | Trade Name - Amortizing [Member]
Gross Carrying Amount	1,325	1,325
Accumulated Amortization	(650)	(600)
Net	675	725
Business Services [Member] | Customer Relationships [Member]
Gross Carrying Amount	147,208	152,079
Accumulated Amortization	(125,848)	(128,738)
Net	21,360	23,341
Business Services [Member] | Noncompete Agreements [Member]
Gross Carrying Amount	35,551	35,818
Accumulated Amortization	(25,101)	(24,662)
Net	10,450	11,156
Business Services [Member] | Trade Name - Amortizing [Member]
Gross Carrying Amount	2,600	2,600
Accumulated Amortization	(2,600)	(2,600)
Business Services [Member] | Trade Name - Non-Amortizing [Member]
Gross Carrying Amount	55,637	55,637
Accumulated Amortization	(4,868)	(4,868)
Net	50,769	50,769
Attest Firm Affiliation [Member]
Gross Carrying Amount	7,629	7,629
Accumulated Amortization	(424)	(318)
Net	$ 7,205	$ 7,311