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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Proceeds from exercise of stock options (in shares)	40,345	332,665
Proceeds from exercise of stock options, tax benefits	$ 509,408	$ 3,049,108
Common stock repurchases (in shares)	733,299	2,569,597

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

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- Definition

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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