Stock Compensation - Annual RSUs and Annual PSUs (Details) - Stock Incentive Plan 2015 - $ / shares	3 Months Ended	6 Months Ended
Sep. 30, 2018	Sep. 30, 2018
Annual RSUs
Number of Shares
Granted (in shares)	42,876	59,235
Weighted- Average Grant-Date Fair Value
Granted (in dollars per share)	$ 114.42	$ 115.65
Annual PSUs
Number of Shares
Granted (in shares)	17,208	31,320
Weighted- Average Grant-Date Fair Value
Granted (in dollars per share)	$ 114.42	$ 116.34
Annual RSUs and Annual PSUs
Number of Shares
Granted (in shares)	60,084	90,555
Weighted- Average Grant-Date Fair Value
Granted (in dollars per share)	$ 114.42	$ 115.89

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=109197908&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).

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

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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