Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2012

Accounting Policies [Abstract]

Basic and diluted earnings per share

	2010			2011			2012
Basic and diluted net income	$	449		$	572		$	513
Income allocated to participating securities		(1	)		(1	)		—
Net income available to common stockholders	$	448		$	571		$	513
Share data (in thousands):
Basic average common shares outstanding		147,834			145,603			143,019
Dilutive effect of stock-based awards		741			910			1,036
Diluted average common shares outstanding		148,575			146,513			144,055
Basic earnings per share	$	3.03		$	3.92		$	3.59
Diluted earnings per share	$	3.02		$	3.90		$	3.56