Earnings per Share - Tabular Disclosure (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Income (loss) from continuing operations	$ (1,991)	$ (1,816)	$ (13,226)	$ 1,041
Income (loss) from discontinued operations, net of tax	(2,936)	2,121,690	(2,936)	2,162,152
Net income (loss)	(4,927)	2,119,874	(16,162)	2,163,193
Net income - basic	(4,927)	2,119,874	(16,162)	2,163,193
Net income - diluted	$ (4,927)	$ 2,119,874	$ (16,162)	$ 2,163,193
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average common shares outstanding used in computing basic income (loss) per share (in shares)	69,111	74,958	70,858	74,823
Dilutive restricted stock units (in shares)				322
Weighted average common shares outstanding used in computing diluted income (loss) per share (in shares)	69,111	74,958	70,858	75,145
Earnings Per Share, Basic [Abstract]
Income (loss) from continuing operations (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.19)	$ 0.01
Income (loss) from discontinued operations, net of tax (in dollars per share)	(0.04)	28.31	(0.04)	28.90
Basic net income per share (in dollars per share)	(0.07)	28.28	(0.23)	28.91
Earnings Per Share, Diluted [Abstract]
Income (loss) from continuing operations (in dollars per share)	(0.03)	(0.02)	(0.19)	0.01
Income (loss) from discontinued operations, net of tax (in dollars per share)	(0.04)	28.31	(0.04)	28.77
Diluted net income (loss) per share (in dollars per share)	$ (0.07)	$ 28.28	$ (0.23)	$ 28.79