Earnings per Share - Tabular Disclosure (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Net income
Loss from continuing operations	$ (11,286)	$ (28,869)	$ (26,362)
Income from discontinued operations, net of tax	2,144,145	139,616	91,215
Net income	2,132,859	110,747	64,853
Net (loss) income - basic	2,132,859	110,747	64,853
Net (loss) income - diluted	$ 2,132,859	$ 110,747	$ 64,853
Weighted average common shares outstanding used in computing diluted earnings per share
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	74,897	74,229	73,557
Dilutive restricted stock units (in shares)		226	293
Weighted average common shares outstanding used in computing diluted earnings per share (in shares)	74,897	74,455	73,850
Basic net income per share:
Loss from continuing operations (in dollars per share)	$ (0.15)	$ (0.39)	$ (0.36)
Income from discontinued operations, net of tax (in dollars per share)	28.63	1.88	1.24
Basic net income per share (in dollars per share)	28.48	1.49	0.88
Diluted net income per share:
Loss from continuing operations (in dollars per share)	(0.15)	(0.39)	(0.36)
Income from discontinued operations, net of tax (in dollars per share)	28.63	1.88	1.24
Diluted net income per share (in dollars per share)	$ 28.48	$ 1.49	$ 0.88