Stock-Based Compensation (Schedule Of Market-Based Restricted Stock Unit Activity) (Details) (Market-Based Restricted Stock Units [Member], USD $)	9 Months Ended
Dec. 31, 2011
Market-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance
Granted	670,000
Forfeited or cancelled	(35,000)
Ending balance	635,000
Weighted-average grant date fair value, beginning balance
Weighted-average grant date fair value, forfeited or cancelled during period	$ 34.77
Weighted-average grant date fair values of restricted stock rights granted	$ 34.77
Weighted-average grant date fair value, ending balance	$ 34.77

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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