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Common And Preferred Stock (Schedule Of Repurchases Of Shares) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Common and Preferred Stock [Abstract]
Number of shares repurchased	80,191	1,113,125	743,876
Cost of shares repurchased (in thousands of dollars)	$ 3,488	$ 46,696	$ 32,942
Weighted-average cost per share	$ 43.49	$ 41.95	$ 44.28

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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