Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB
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Subsequent Events (Details) - $ / shares					12 Months Ended
Subsequent Events (Details) - $ / shares	May 04, 2020	Jul. 30, 2019	May 13, 2019	May 06, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Subsequent Event [Line Items]
Granted (in shares)					302,700	294,500	182,800
Performance Units
Subsequent Event [Line Items]
Granted (in shares)				98,644
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Granted (in shares)		4,183	7,287	89,286	220,300	226,400	105,800
Stock Options
Subsequent Event [Line Items]
Granted (in shares)			21,194	281,487
Award grant exercise price (in dollars per share)			$ 30.19	$ 30.56
Subsequent Event \| Performance Units
Subsequent Event [Line Items]
Granted (in shares)	79,070
Award vesting period	3 years
Subsequent Event \| Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Granted (in shares)	73,637
Award vesting period	3 years
Vesting rights (as percent)	33.30%
Subsequent Event \| Restricted Stock Units (RSUs) \| Director
Subsequent Event [Line Items]
Granted (in shares)	907
Award vesting period	1 year
Subsequent Event \| Stock Options
Subsequent Event [Line Items]
Granted (in shares)	249,874
Award vesting period	3 years
Vesting rights (as percent)	33.30%
Award term	ten
Award grant exercise price (in dollars per share)	$ 39.98