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				6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 61,864	$ 39,399	$ 129,152	$ 32,711	$ 101,263	$ 161,863
Weighted average shares outstanding (in shares)	66,775		67,780		66,888	67,754
Dilutive impact from:
Employee equity awards (in shares)	474		620		449	606
Dilutive weighted average shares outstanding (in shares)	67,249		68,400		67,337	68,360
Income per share
Basic (in dollars per share)	$ 0.93		$ 1.91		$ 1.51	$ 2.39
Dilutive (in dollars per share)	$ 0.92		$ 1.89		$ 1.50	$ 2.37