CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	(Accumulated Deficit) Retained Earnings	Net Parent Investment	Accumulated Other Comprehensive (Loss) Income
Balance at Sep. 30, 2019	$ 1,068,128				$ 1,097,127	$ (28,999)
Net (loss) income	(18,316)			$ (18,316)
Other comprehensive income (loss)	16,982					16,982
Distribution to Parent	(152,978)				(152,978)
Net (decrease) increase in net parent investment	9,630				(6,098)	15,728
Reclassification of net parent investment in Cerence			$ 938,051		$ (938,051)
Issuance of common stock at separation		$ 364	(364)
Issuance of common stock at separation, (in shares)		36,391
Issuance of common stock	1,318	$ 7	1,311
Issuance of common stock, (in shares)		706
Stock withheld to cover tax withholdings requirements upon stock vesting	(9,369)	$ (2)	(9,367)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(255)
Convertible Senior Notes conversion feature	14,371		14,371
Stock-based compensation	30,305		30,305
Balance at Sep. 30, 2020	960,071	$ 369	974,307	(18,316)		3,711
Balance (in shares) at Sep. 30, 2020		36,842
Net (loss) income	45,893			45,893
Other comprehensive income (loss)	(2,077)					(2,077)
Issuance of common stock	11,522	$ 17	11,505
Issuance of common stock, (in shares)		1,718
Stock withheld to cover tax withholdings requirements upon stock vesting	(46,009)	$ (5)	(46,004)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(535)
Stock-based compensation	62,545		62,545
Balance at Sep. 30, 2021	1,031,945	$ 381	1,002,353	27,577		1,634
Balance (in shares) at Sep. 30, 2021		38,025
Net (loss) income	(310,826)			(310,826)
Other comprehensive income (loss)	(35,371)					(35,371)
Issuance of common stock	36,062	$ 14	36,048
Issuance of common stock, (in shares)		1,584
Stock withheld to cover tax withholdings requirements upon stock vesting	(49,003)	$ (1)	(49,002)
Stock withheld to cover tax withholdings requirements upon stock vesting, (in shares)		(179)
Stock-based compensation	40,143		40,143
Balance at Sep. 30, 2022	$ 712,950	$ 394	$ 1,029,542	$ (283,249)		$ (33,737)
Balance (in shares) at Sep. 30, 2022		39,430