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Treasury Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			12 Months Ended
	Mar. 31, 2012	Jul. 26, 2006	Sep. 17, 2001	Mar. 31, 2012 Open Market Stock Repurchase Program [Member]	Mar. 31, 2012 Restricted Stock [Member]	Mar. 31, 2011 Restricted Stock [Member]	Mar. 31, 2010 Restricted Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock authorized to repurchase under stock repurchase program		4,000,000	1,000,000
Additional stock authorized to repurchase under stock repurchase program		3,000,000
Shares repurchased during the period, shares	1,756,794			1,270,000	216,882	164,074	188,567
Shares repurchased during the period, value				$ 16.2	$ 4.4	$ 3.7	$ 2.8

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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