Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Treasury Stock, Value, Acquired, Cost Method									$ 150,000	$ 300,000	$ 200,000
Net income	$ 94,530	$ 41,826	$ 39,801	$ 53,514	$ 105,994	$ 61,951	$ 56,454	$ 36,966	$ 229,671	$ 261,362	$ 281,234
Basic (in shares)	67,634,000	67,806,000	68,114,000	68,441,000	68,839,000	69,423,000	70,428,000	70,988,000	68,000,000	69,925,000	72,140,000
Dilutive impact from employee equity awards									727,000	862,000	816,000
Diluted (in shares)	68,176,000	68,482,000	68,844,000	69,317,000	69,638,000	70,160,000	71,148,000	72,015,000	68,727,000	70,787,000	72,956,000
Basic (in dollars per share)	$ 1.40	$ 0.62	$ 0.58	$ 0.78	$ 1.54	$ 0.89	$ 0.80	$ 0.52	$ 3.38	$ 3.74	$ 3.90
Diluted (in dollars per share)	$ 1.39	$ 0.61	$ 0.58	$ 0.77	$ 1.52	$ 0.88	$ 0.79	$ 0.51	$ 3.34	$ 3.69	$ 3.85
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									287,809
Share-based Payment Arrangement [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									670,000	784,000	419,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit									$ 116.90
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit									$ 138.14