Stock Based Compensation Plans - Stock Options (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, beginning balance	2,872	3,100	4,006
Granted (shares)	0	0	0
Forfeited (shares)	(4)	(228)	(514)
Exercised (shares)	0	0	(393)
Number of shares outstanding, ending balance	2,868	2,872	3,100	4,006
Vested and exercisable (shares)	2,868	2,786	2,769
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning balance (per share)	$ 7.94	$ 8.02	$ 7.79
Granted (per share)			$ 6.29
Forfeited (per share)	$ 6.29	$ 9.01	$ 9.28
Exercised (per share)			$ 3.90
Weighted average exercise price, ending balance (per share)	$ 7.94	$ 7.94	$ 8.02	$ 7.79
Vested and Exercisable (per share)	$ 7.94	$ 7.99	$ 7.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life	4 years	5 years	6 years	7 years
Vested and exercisable (period)	4 years	4 years 10 months 24 days	5 years 9 months 18 days

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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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Gross 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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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