Stock-Based Compensation - Annual Awards (Details) - Stock Incentive Plan 2015 - $ / shares	9 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	44,702	60,000
Weighted-average grant date fair value (in dollars per share)	$ 171.72	$ 115.80
Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	19,509	31,320
Weighted-average grant date fair value (in dollars per share)	$ 174.34	$ 116.34
Annual RSUs and Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	64,211	91,320
Weighted-average grant date fair value (in dollars per share)	$ 172.51	$ 115.98

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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