Net Income Per Share - Calculations of Basic and Diluted Net Income per Share and Basic and Dilutive Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Net income	$ 62,495	$ 129,152	$ 32,711	$ 41,826	$ 39,801	$ 53,514	$ 224,358	$ 135,141
Weighted average shares outstanding (in shares)	67,920			67,806			67,809	68,122
Dilutive impact from:
Employee equity awards (in shares)	688			676			630	784
Dilutive weighted average shares outstanding (in shares)	68,608			68,482			68,439	68,906
Income per share
Basic (in dollars per share)	$ 0.92			$ 0.62			$ 3.31	$ 1.98
Dilutive (in dollars per share)	$ 0.91			$ 0.61			$ 3.28	$ 1.96