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Share-based Compensation - Additional Information Related to SSARs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,057	$ 2,896	$ 2,812
Stock Settled Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	944	1,872	1,718
Total intrinsic value of SSARs exercised	373	1,871	189
Total fair value of SSARs vesting	$ 778	$ 3,197	$ 1,708

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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