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Change in Number of Shares of Common Stock Outstanding (Detail) - shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding, beginning balance	41,915,000	43,447,536	43,189,502
Purchase of treasury stock	(726,347)	(1,756,831)
Shares issued in acquisition (in shares)	1,177,630
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	254,467	224,295	258,034
Shares outstanding, ending balance	42,620,750	41,915,000	43,447,536

X

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

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- Definition

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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