Other Income and Expense (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Other Income And Expense (Textual) [Abstract]
Impairment charge related to the Don Eduardo trademark			$ 12
Sales price		234
Net income	513	572	449
Other income expense [Member]
Other Income And Expense (Textual) [Abstract]
Impairment charge related to the Don Eduardo trademark			12
Net income		$ 38