Goodwill And Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Apr. 30, 2011
Amortization of intangible assets	$ 7,700,000	$ 6,900,000
Estimated amortization 2012	27,100,000
Estimated amortization 2013	22,700,000
Estimated amortization 2014	19,200,000
Estimated amortization 2015	14,400,000
Estimated amortization 2016	13,000,000
Goodwill	742,611,000		846,245,000
RSM McGladrey Litigation [Member]
Goodwill impairment	85,400,000
EquiCo [Member]
Goodwill impairment	14,300,000
Caturano & Company, Inc. [Member]
Unfavorable leasehold	5,900,000
Unfavorable leasehold, net	5,300,000
Tax Services [Member]
Goodwill	437,741,000		434,151,000
Business Services [Member]
Goodwill	$ 304,870,000		$ 412,094,000

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Business acquisition liabilities assumed unfavorable leasehold net.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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The amount of amortization expense expected to be recognized during the remainder of the current fiscal year.

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The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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