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Restructuring Costs (Details) (USD $) In Millions	12 Months Ended
Restructuring Costs (Details) (USD $) In Millions	Apr. 30, 2009
Restructuring Costs (Textuals) [Abstract]
Expense Related To to reduce our workforce through involuntary employment termination and voluntary early retirement	$ 12
Amount of material additional expenses incurred as a result of reduction in workforce	$ 0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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