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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, 2011
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	1,993
Forfeited or cancelled	(423)
Ending balance	1,570
Weighted-average grant date fair value, beginning balance	$ 47.00
Weighted-average grant date fair value, forfeited or cancelled during period	$ 34.80
Weighted-average grant date fair value, ending balance	$ 50.29

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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