Stock-Based Compensation (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	9 Months Ended
Dec. 31, 2012
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]
Beginning balance	1,421
Vested	(19)
Forfeited or cancelled	(78)
Ending balance	1,324
Weighted-average grant date fair value, beginning balance	$ 50.35
Weighted-average grant date fair value, vested during period	$ 15.39
Weighted-average grant date fair value, forfeited or cancelled during period	$ 38.67
Weighted-average grant date fair value, ending balance	$ 51.54

Stock-Based Compensation (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

9 Months Ended

Dec. 31, 2012

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]

Beginning balance

1,421

Vested

(19)

Forfeited or cancelled

(78)

Ending balance

1,324

Weighted-average grant date fair value, beginning balance

$ 50.35

Weighted-average grant date fair value, vested during period

$ 15.39

Weighted-average grant date fair value, forfeited or cancelled during period

$ 38.67

Weighted-average grant date fair value, ending balance

$ 51.54

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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