Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (Stock Option [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Dec. 31, 2011
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the beginning of period, Number of Stock Options	6,886
Granted, Number of Stock Options	994
Exercised, Number of Stock Options	(849)
Forfeited, Number of Stock Options	(34)
Outstanding at the end of period, Number of Stock Options	6,997
Vested or expected to vest as of September 30, 2011, Number of Stock Options	6,976
Exercisable as of September 30, 2011, Number of Stock Options	4,426
Outstanding at the beginning of period, Weighted-Average Exercise Price	$ 41.11
Granted, Weighted-Average Exercise Price	$ 66.37
Exercised, Weighted-Average Exercise Price	$ 27.04
Forfeited, Weighted-Average Exercise Price	$ 56.79
Outstanding at the end of period, Weighted-Average Exercise Price	$ 46.33
Vested or expected to vest as of Sept 30, 2011, Weighted-Average Exercise Price	$ 46.28
Exercisable, Weighted Average Exercise Price	$ 39.20

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Number of share options (or share units) exercised during the current period.

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