Stock-Based Compensation - Stock-Based Compensation Accounting (Details) - Stock Options - $ / shares	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Weighted average assumptions
Weighted average fair value (in dollars per share)	$ 31.25	$ 17.07	$ 13.16
Risk-free interest rate (as a percent)	2.80%	1.70%	1.20%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Expected life (in years)	4 years 7 months 6 days	4 years 7 months 6 days	4 years 7 months 6 days
Expected volatility factor (as a percent)	26.60%	28.00%	31.30%

No definition available.

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- Definition

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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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