Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Loss from continuing operations	$ (136,880)	$ (1,991)	$ (152,604)	$ (13,226)
Loss from discontinued operations, net of tax		(2,936)		(2,936)
Net Income (Loss)	(136,880)	(4,927)	(152,604)	(16,162)
Net loss - basic	(136,880)	(4,927)	(152,604)	(16,162)
Net loss - diluted	$ (136,880)	$ (4,927)	$ (152,604)	$ (16,162)
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average common shares outstanding used in computing basic loss per share (in shares)	55,440	69,111	56,078	70,858
Weighted average common shares outstanding used in computing diluted loss per share (in shares)	55,440	69,111	56,078	70,858
Earnings Per Share, Basic [Abstract]
Loss from continuing operations (in dollars per share)	$ (2.47)	$ (0.03)	$ (2.72)	$ (0.19)
Loss from discontinued operations, net of tax (in dollars per share)		(0.04)		(0.04)
Basic net loss per share (in dollars per share)	(2.47)	(0.07)	(2.72)	(0.23)
Earnings Per Share, Diluted [Abstract]
Loss from continuing operations (in dollars per share)	(2.47)	(0.03)	(2.72)	(0.19)
Loss from discontinued operations, net of tax (in dollars per share)		(0.04)		(0.04)
Diluted net loss per share (in dollars per share)	$ (2.47)	$ (0.07)	$ (2.72)	$ (0.23)