Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net loss	$ (102,946)	$ 48,675	$ (41,325)	$ (72,046)	$ 44,366	$ (62,872)	$ (95,596)	$ (90,552)
Denominator:
Weighted-average basic shares outstanding (in shares)	107,004			105,753			106,597	105,273
Effect of dilutive securities (in shares)	0			0			0	0
Weighted-average diluted shares outstanding (in shares)	107,004			105,753			106,597	105,273
Basic (in dollars per share)	$ (0.96)			$ (0.68)			$ (0.90)	$ (0.86)
Diluted (in dollars per share)	$ (0.96)			$ (0.68)			$ (0.90)	$ (0.86)
Potentially dilutive securities excluded from computation of diluted earnings per share (in shares)	3,467						4,024