Stock Based Compensation Stock-Based Compensation - Summary of Assumptions Used for Market Share Units (Details) - $ / shares	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	554,906
Weighted Average Remaining Contractual Life	8 years
Weighted Average Exercise Price	$ 72.31
Performance Market Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.66%	1.57%	0.94%
Dividend yield	0.00%	0.00%	0.00%
Time of maturity, in years	3 years	3 years	3 years
Expected volatility	26.41%	27.49%	31.74%
Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.77%	2.08%	1.41%
Dividend yield	0.93%	0.84%	1.22%
Time of maturity, in years	6 years	6 years	6 years
Expected volatility	26.80%	29.20%	30.40%
$55.00-$60.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	137,599
Weighted Average Remaining Contractual Life	7 years 1 month 6 days
Weighted Average Exercise Price	$ 57.60
$65.01-$70.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	73,368
Weighted Average Remaining Contractual Life	5 years 9 months 18 days
Weighted Average Exercise Price	$ 68.82
$75.01-$83.14
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options	343,939
Weighted Average Remaining Contractual Life	8 years 9 months 18 days
Weighted Average Exercise Price	$ 78.95

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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No definition available.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 (f)(2)(i)
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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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