Stock Incentive Plan and Employee Stock Purchase Plan - ESPP (Details) - ESPP	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Minimum
Weighted average assumptions used for determining fair value of options
Risk-free interest rate (as a percent)	1.07%	0.49%	0.51%
Expected term (in years)	6 months	6 months	6 months
Expected volatility (as a percent)	31.30%	24.60%	33.30%
Maximum
Weighted average assumptions used for determining fair value of options
Risk-free interest rate (as a percent)	2.28%	0.70%	0.70%
Expected term (in years)	1 year	1 year	1 year
Expected volatility (as a percent)	51.10%	42.00%	49.10%

No definition available.

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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

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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