Net Income Per Share - Stock Options Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Details) - $ / shares	3 Months Ended	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
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)	10,723	377,740
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)		$ 63.25
Exercise price range, high end of range (in dollars per share)		$ 66.57