Quarterly Results (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2012

Quarterly Results [Abstract]

Quarterly results

	Fiscal 2012								Fiscal 2011
	Quarter Ended								Quarter Ended
	June 30, 2011		Sept. 30, 2011		Dec. 31, 2011		Mar. 31, 2012		June 30, 2010		Sept. 30, 2010		Dec. 31, 2010		Mar. 31, 2011
					(In millions, except per share data)
Total revenue	$	502.4	$	556.7	$	548.2	$	564.7	$	460.9	$	502.3	$	539.9	$	562.2
Gross profit	$	372.9	$	414.7	$	410.6	$	404.9	$	352.6	$	391.6	$	409.0	$	428.5
Operating income	$	115.1	$	161.0	$	161.8	$	106.0	$	108.1	$	143.5	$	139.4	$	141.8
Net earnings	$	95.7	$	114.7	$	119.9	$	70.7	$	92.8	$	131.8	$	109.1	$	122.5
Basic EPS	$	0.54	$	0.66	$	0.72	$	0.43	$	0.51	$	0.74	$	0.61	$	0.69
Diluted EPS	$	0.53	$	0.65	$	0.71	$	0.43	$	0.50	$	0.73	$	0.60	$	0.67
Shares used in computing basic EPS		176.3		173.0		167.2		163.3		180.3		178.3		178.2		178.1
Shares used in computing diluted EPS		180.6		176.0		169.5		165.6		183.8		181.4		182.3		182.3