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Property and Equipment (Narrative) (Details) (USD $) In Millions	12 Months Ended
	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Tax incentives received relating to corporate headquarters building	$ 6.5	$ 10.3
Depreciation and amortization	92.2	96.9	96.6
Capitalized Software [Member]
Depreciation and amortization	$ 18.8	$ 21.8	$ 23.4

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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