Stock-Based Compensation (Schedule Of Restricted Stock Rights Activity, Excluding Performance-Based Activity) (Details) (Restricted stock rights, USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Restricted stock rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance			13,971,000
Granted			9,433,000
Vested			(5,123,000)
Forfeited or cancelled			(1,564,000)
Ending balance	16,717,000		16,717,000
Weighted-average grant date fair value, beginning balance			$ 22.01
Weighted-average grant date fair values of restricted stock rights granted	$ 22.10	$ 15.59	$ 22.17	$ 17.25
Weighted-average grant date fair value, vested during period			$ 20.33
Weighted-average grant date fair value, forfeited or cancelled during period	$ 20.22		$ 20.22
Weighted-average grant date fair value, ending balance	$ 22.78		$ 22.78