Stock-Based Compensation And Employee Benefit Plans (Schedule Of Performance-Based Restricted Stock Unit Activity) (Details) (Performance Based Restricted Stock Units [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Balance as of March 31, 2013	1,324
Vested	36
Forfeited or cancelled	(1,234)
Balance as of March 31, 2014	54
Weighted-Average Grant Date Fair Values, Balance as of March 31, 2013	$ 51.54
Weighted-Average Grant Date Fair Values, Vested	$ 15.39
Weighted-Average Grant Date Fair Values, Forfeited or cancelled	$ 48.32
Weighted-Average Grant Date Fair Values, Balance as of March 31, 2014	$ 15.39