Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Treasury Stock, Value, Acquired, Cost Method									$ 300,000		$ 275,000
Net income	$ 103,865	$ 61,587	$ 59,217	$ 38,066					$ 262,734	$ 148,688	$ 162,196
Basic (in shares)	68,839,000	69,423,000	70,428,000	70,988,000					69,925,000	72,140,000	76,491,000
Dilutive impact from employee equity awards									862,000
Diluted (in shares)	69,638,000	70,160,000	71,148,000	72,015,000					70,787,000	72,956,000	76,978,000
Basic (in dollars per share)	$ 1.51	$ 0.89	$ 0.84	$ 0.54					$ 3.76	$ 2.06	$ 2.12
Diluted (in dollars per share)	$ 1.49	$ 0.88	$ 0.83	$ 0.53					$ 3.71	$ 2.04	$ 2.11
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									245,252
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									784,000	419,000	525,000
Employee Stock Option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit									$ 103.19
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit									$ 123.56
Accelerated Share Repurchase Program [Member]
Treasury Stock, Value, Acquired, Cost Method											$ 100,000
Accounting Standards Update 2014-09 (Topic 606) [Member]
Treasury Stock, Value, Acquired, Cost Method										$ 200,000	375,000
Net income					$ 76,646	$ 44,506	$ 132,030	$ 40,521		$ 293,703	$ 179,386
Basic (in shares)					71,349,000	71,828,000	72,342,000	73,024,000		72,140,000	76,491,000
Dilutive impact from employee equity awards										816,000	487,000
Diluted (in shares)					72,315,000	72,663,000	73,036,000	73,609,000		72,956,000	76,978,000
Basic (in dollars per share)					$ 1.07	$ 0.62	$ 1.83	$ 0.55		$ 4.07	$ 2.35
Diluted (in dollars per share)					$ 1.06	$ 0.61	$ 1.81	$ 0.55		$ 4.03	$ 2.33