Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 488,306	$ 464,153	$ 449,896
Accumulated Amortization	(192,093)	(179,714)	(174,703)
Net	296,213	284,439	275,193
Tax Services
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	98,738	91,745	82,405
Accumulated Amortization	(76,517)	(72,764)	(69,508)
Net	22,221	18,981	12,897
Tax Services | Reacquired Franchise Rights
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	222,371	214,330	214,330
Accumulated Amortization	(20,414)	(18,204)	(16,143)
Net	201,957	196,126	198,187
Tax Services | Customer Relationships
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	109,237	100,719	95,647
Accumulated Amortization	(53,501)	(48,733)	(50,151)
Net	55,736	51,986	45,496
Tax Services | Noncompete Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	23,659	23,058	22,313
Accumulated Amortization	(21,898)	(21,728)	(21,525)
Net	1,761	1,330	788
Tax Services | Franchise Agreements
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	19,201	19,201	19,201
Accumulated Amortization	(6,294)	(5,654)	(5,014)
Net	12,907	13,547	14,187
Tax Services | Purchased Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	14,800	14,800	14,700
Accumulated Amortization	(13,169)	(12,331)	(11,495)
Net	1,631	2,469	3,205
Tax Services | Trade Name
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	300	300	1,300
Accumulated Amortization	(300)	(300)	(867)
Net	$ 0	$ 0	$ 433