Stock-Based Compensation (Schedule Of Restricted Stock Rights Activity, Excluding Performance-Based Activity) (Details) (Restricted Stock Rights [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Restricted Stock Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance		16,323
Granted		7,938
Vested		(4,583)
Forfeited or cancelled		(993)
Ending balance	18,685	18,685
Weighted-average grant date fair value, beginning balance		$ 20.73
Weighted-average grant date fair values of restricted stock rights granted	$ 12.43	$ 12.51
Weighted-average grant date fair value, vested during period		$ 21.56
Weighted-average grant date fair value, forfeited or cancelled during period		$ 18.86
Weighted-average grant date fair value, ending balance	$ 17.13	$ 17.13