Stock-Based Compensation - Annual Awards (Details) - Stock Incentive Plan 2015 - $ / shares	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted (in shares)	52,256	47,015	67,515
Weighted-average grant date fair value per share (in dollars per share)	$ 363.89	$ 220.31	$ 172.34
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Shares Granted (in shares)	52,256	47,015	47,577
Weighted-average grant date fair value per share (in dollars per share)	$ 363.89	$ 220.31	$ 171.50
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Shares Granted (in shares)	0	0	19,938
Weighted-average grant date fair value per share (in dollars per share)	$ 0	$ 0	$ 174.36

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
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-Subparagraph (a)(1)
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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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).

+ References

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