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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares				12 Months Ended
	Jul. 30, 2019	May 13, 2019	May 06, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Shares
Outstanding, beginning of period (in shares)				413,000.0	393,500	350,100
Granted (in shares)	4,183	7,287	89,286	220,300	226,400	105,800
Vested and issued (in shares)				(87,000.0)	(175,800)	(53,300)
Forfeited (in shares)				(34,200)	(31,100)	(9,100)
Outstanding, end of period (in shares)				512,100	413,000.0	393,500
Vested, end of period (in shares)				124,200	113,200	90,500
Weighted-Average Grant-Date Fair Value
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)				$ 36.58	$ 44.13	$ 39.29
Granted, weighted-average grant-date fair value (in USD per share)				31.02	30.09	55.61
Vested and issued, weighted-average grant-date fair value (in USD per share)				46.78	43.05	34.30
Forfeited, weighted-average grant-date fair value (in USD per share)				35.97	48.32	48.76
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)				32.49	36.58	44.13
Vested, end of period, weighted-average grant-date fair value (in USD per share)				$ 30.54	$ 31.05	$ 29.88

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Issued

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Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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