Stock-Based Compensation Stock-Based Compensation (Details 5) (USD $) In Thousands, except Per Share data, unless otherwise specified				12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2012 Range of exercise price, $ 12.65 - $ 25.00	Mar. 31, 2012 Range of exercise price, $ 25.01 - $ 35.00	Mar. 31, 2012 Range of exercise price, $ 35.01 - $ 94.00	Mar. 31, 2012 Range of exercise price, $ 94.01 - $ 100.00	Mar. 31, 2012 Range of exercise price, $ 100.01 - $ 134.97	Mar. 31, 2012 Total stock options
Stock options outstanding, and stock options exercisable
Lower range				$ 12.65	$ 25.01	$ 35.01	$ 94.01	$ 100.01
Upper range				$ 25.00	$ 35.00	$ 94.00	$ 100.00	$ 134.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number				86	3,284	304	550	1,400	5,624
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price				$ 14.82	$ 31.61	$ 55.65	$ 95.19	$ 107.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				4.4	5.6	0.6	2.3	2.2
Options exercisable (in shares)	3,334	2,860	2,810	51	1,134	304	550	1,295
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$ 14.73	$ 31.13	$ 55.65	$ 95.19	$ 108.11

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.

+ References

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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