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Stock-Based Compensation (Schedule Of Market-Based Restricted Stock Unit Activity) (Details) (Market-Based Restricted Stock Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Sep. 30, 2013
Market-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]  
Beginning balance 925
Granted 555
Vested (304)
Forfeited or cancelled (114)
Ending balance 1,062
Weighted-average grant date fair value, beginning balance $ 19.16
Weighted-average grant date fair values of market-based restricted stock rights granted $ 29.52
Weighted-average grant date fair value, vested during period $ 16.01
Weighted-average grant date fair value, forfeited or cancelled during period $ 24.93
Weighted-average grant date fair value, ending balance $ 24.86