Stock-Based Compensation Plans (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Jun. 30, 2012	Mar. 31, 2012
Summary of option plans activity
Number of Shares, Beginning balance	17,788	24,969
Number of Shares, Granted	0	207
Number of Shares, Exercised	(362)	(3,622)
Number of Shares, Forfeited/cancelled/expired	(1,112)	(3,766)
Number of Shares, Ending balance	16,314	17,788
Number of Shares, Options exercisable	14,264	15,349
Weighted-Average Exercise Price Per Share, Beginning balance	$ 28.32	$ 29.11
Weighted-Average Exercise Price Per Share, Granted	$ 0.00	$ 34.79
Weighted-Average Exercise Price Per Share, Exercised	$ 24.14	$ 24.70
Weighted-Average Exercise Price Per Share, Forfeited/cancelled/expired	$ 41.79	$ 37.35
Weighted-Average Exercise Price Per Share, Ending balance	$ 27.50	$ 28.32
Weighted-Average Exercise Price Per Share, Options exercisable	$ 27.76	$ 28.78

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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For presentations that combine terminations, 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 or that expired.

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