Stock-based Compensation (Summary of Stock Option Plans Activity) (Details) (Stock Options [Member], USD $)	9 Months Ended
Dec. 31, 2012
Stock Options [Member]
Number of Options Outstanding
Beginning Balance	3,673,862
Granted	734,500
Exercised	(545,406)
Canceled	(171,992)
Expired	(209,337)
Ending Balance	3,481,627
Weighted Average Exercise Price per Share
Beginning Balance	$ 15.40
Granted	$ 10.85
Exercised	$ 7.67
Canceled	$ 13.36
Expired	$ 15.22
Ending Balance	$ 15.76

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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Net number of share options (or share units) granted during the 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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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