Stock-based Compensation and Employee Benefit Plans (Schedule of Restricted Stock Rights Activity, Excluding Performance-Based Activity) (Details) (Restricted Stock Rights [Member], USD $) In Thousands, except Per Share data	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Restricted Stock Rights [Member]
Balance as of March 31, 2010	14,300
Granted	8,090
Vested	(6,520)
Forfeited or cancelled	(1,899)
Balance as of March 31, 2011	13,971	14,300
Weighted-average grant date fair value, balance as of March 31, 2010	$ 24.45
Weighted-average grant date fair value of stock-based compensation granted during period	$ 17.38	$ 18.10	$ 32.42
Weighted-average grant date fair value, vested during period	$ 21.81
Weighted-average grant date fair value, forfeited or cancelled during period	$ 21.32
Weighted-average grant date fair value, balance as of March 31, 2011	$ 22.01	$ 24.45