Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2011

Accounting Policies [Abstract]

Basic and Diluted Earnings Per Share

	2009			2010			2011
Basic and diluted net income	$	435		$	449		$	572
Income allocated to participating securities (restricted shares)		(1	)		(1	)		(1	)
Net income available to common stockholders	$	434		$	448		$	571
Share data (in thousands):
Basic average common shares outstanding		150,452			147,834			145,603
Dilutive effect of stock options, SSARs, RSUs, and DSUs		927			741			910
Diluted average common shares outstanding		151,379			148,575			146,513
Basic earnings per share	$	2.88		$	3.03		$	3.92
Diluted earnings per share	$	2.87		$	3.02		$	3.90

SSARs for approximately 1,899,000 common shares, 824,000 common shares, and 350,000 common shares were excluded from the calculation of diluted earnings per share for 2009, 2010, and 2011, respectively, because they were not dilutive for those periods under the treasury stock method.