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Stockholders' Equity and Noncontrolling Interests - (Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Equity [Abstract]
Purchase of treasury stock (in shares)	581,140
Treasury stock purchased during period, value	$ 34,561	$ 0
Treasury stock (in shares)	12,803,302		12,227,773
Treasury shares issued (in shares)	5,611
Treasury shares issued (in dollars per share)	$ 62.55

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Stock Issued During Period, Shares, Treasury Stock Reissued, Per Share

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- Definition

The cash outflow to reacquire common stock during the period.

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-Publisher FASB
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-Topic 230
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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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

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