Stock-Based Compensation - Additional Disclosures (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation, additional disclosures
Exercises of stock options			$ 3,548	$ 4,843
Common stock reserved for future issuance or settlement (in shares)	10.5		10.5
Restricted Stock Units
Stock-based compensation, additional disclosures
Weighted average grant-date fair value of RSUs granted	$ 66.52	$ 47.73	$ 63.24	$ 45.93
Total fair value of shares vested from RSU grants	$ 4,900	$ 4,200	$ 10,200	$ 8,300
Total unrecognized compensation cost	32,500		$ 32,500
Total unrecognized compensation cost, period of recognition			2 years 9 months 22 days
Excess tax benefits from stock-based compensation	$ 1,800	$ 1,500	$ 3,400	$ 2,800
Stock Options
Stock-based compensation, additional disclosures
Weighted average fair value (in dollars per share)	$ 16.65	$ 12.45	$ 16.86	$ 12.96
Total unrecognized compensation cost	$ 9,400		$ 9,400
Total unrecognized compensation cost, period of recognition			2 years 10 months 6 days
Total intrinsic value of options exercised	1,300	$ 1,400	$ 2,900	$ 4,100
Exercises of stock options	$ 1,100	$ 1,800	$ 3,500	$ 4,800