Net Income Per Share - Stock Options Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Details) - $ / shares	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Stock Options
Employee equity awards were excluded from the calculation of dilutive weighted average shares outstanding because their effect would be anti-dilutive
Options to purchase shares of common stock (in shares)	3,892	29,818
Stock Options
Employee equity awards were excluded from the calculation of dilutive weighted average shares outstanding because their effect would be anti-dilutive
Exercise price range, low end of range (in dollars per share)		$ 75.74
Exercise price range, high end of range (in dollars per share)		$ 78.77