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Change in Number of Shares of Common Stock Outstanding (Detail)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stockholders Equity [Line Items]
Shares outstanding, beginning balance	47,800,129	50,034,353	48,581,832
Purchase of treasury stock	(683,192)	(2,646,885)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	723,267	412,661	1,452,521
Shares outstanding, ending balance	47,840,204	47,800,129	50,034,353

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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