Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2012

Stockholders' Equity [Abstract]

Computation of Basic and Diluted EPS

	Year Ended March 31,
	2012		2011			2010
	(In millions, except per share data)
Basic earnings per share:
Net earnings	$	401.0	$	456.2		$	406.1
Less earnings allocated to participating securities		—		(0.3	)		(0.8	)
Net earnings allocated to common shares	$	401.0	$	455.9		$	405.3
Weighted average number of common shares outstanding		169.9		178.7			183.1
Basic earnings per share	$	2.36	$	2.55		$	2.21
Diluted earnings per share:
Net earnings	$	401.0	$	456.2		$	406.1
Less earnings allocated to participating securities		—		(0.3	)		(0.8	)
Net earnings allocated to common shares	$	401.0	$	455.9		$	405.3
Weighted average number of common shares outstanding		169.9		178.7			183.1
Incremental shares from assumed conversions of share-based awards		2.9		3.7			3.7
Adjusted weighted average number of common shares outstanding		172.8		182.4			186.8
Diluted earnings per share	$	2.32	$	2.50		$	2.17