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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-SubTopic 10
-Section 50
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Subsequent Events (Details) - $ / shares				12 Months Ended
Subsequent Events (Details) - $ / shares	May 03, 2021	Aug. 04, 2020	May 04, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Subsequent Event [Line Items]
Granted (in shares)				249,900	302,700	294,500
Performance Units
Subsequent Event [Line Items]
Granted (in shares)			79,070
Award vesting period				3 years
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Granted (in shares)			907	179,700	220,300	226,400
Award vesting period				3 years
Restricted Stock Units (RSUs) \| Director
Subsequent Event [Line Items]
Granted (in shares)		3,732
Stock Options
Subsequent Event [Line Items]
Granted (in shares)			249,875
Award grant exercise price (in dollars per share)			$ 39.98
Stock Options \| Minimum
Subsequent Event [Line Items]
Award vesting period				3 years
Subsequent Event \| Performance Units
Subsequent Event [Line Items]
Granted (in shares)	77,345
Award vesting period	3 years
Subsequent Event \| Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Granted (in shares)	73,108
Award vesting period	3 years
Vesting rights (as percent)	33.30%
Subsequent Event \| Restricted Stock Units (RSUs) \| Minimum
Subsequent Event [Line Items]
Award vesting period	3 years
Subsequent Event \| Restricted Stock Units (RSUs) \| Maximum
Subsequent Event [Line Items]
Award vesting period	5 years
Subsequent Event \| Restricted Stock Units (RSUs) \| Director
Subsequent Event [Line Items]
Granted (in shares)	1,636
Award vesting period	1 year
Subsequent Event \| Stock Options
Subsequent Event [Line Items]
Granted (in shares)	222,660
Award vesting period	3 years
Vesting rights (as percent)	33.30%
Award term	ten years
Award grant exercise price (in dollars per share)	$ 44.33