CONSOLIDATED AND COMBINED STATEMENT OF EQUITY AND CHANGES IN PARENT COMPANY EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	Accumulated (Deficit) Earnings	Net Parent Investment	Accumulated Other Comprehensive Loss
Balance at Sep. 30, 2018	$ 993,319				$ 1,017,276	$ (23,957)
Accumulated adjustment related to the adoption | ASC 606	6,974				6,974
Net income	2,709				2,709
Other comprehensive income (loss)	(2,813)					(2,813)
Net transfer to Parent	(17,003)				(17,003)
Balance at Mar. 31, 2019	983,186				1,009,956	(26,770)
Balance at Dec. 31, 2018	999,163				1,026,505	(27,342)
Net income	454				454
Other comprehensive income (loss)	572					572
Net transfer to Parent	(17,003)				(17,003)
Balance at Mar. 31, 2019	983,186				1,009,956	(26,770)
Balance at Sep. 30, 2019	1,068,128				1,097,127	(28,999)
Net income	733			$ 733
Other comprehensive income (loss)	(1,364)					(1,364)
Distribution to Parent	(152,978)				(152,978)
Net (decrease) increase in net parent investment	11,453				(4,275)	15,728
Reclassification of net parent investment in Cerence			$ 939,874		$ (939,874)
Issuance of common stock at separation		$ 364	(364)
Issuance of common stock at separation, (in shares)		36,391
Stock issued pursuant to employee stock plans	(918)	$ 1	(919)
Stock issued pursuant to employee stock plans, (in shares)		67
Stock-based compensation	11,325		11,325
Balance at Mar. 31, 2020	936,379	$ 365	949,916	733		(14,635)
Balance (in shares) at Mar. 31, 2020		36,458
Balance at Dec. 31, 2019	926,215	$ 364	945,054	(11,762)		(7,441)
Balance (in shares) at Dec. 31, 2019		36,403
Net income	12,495			12,495
Other comprehensive income (loss)	(7,194)					(7,194)
Stock issued pursuant to employee stock plans	(777)	$ 1	(778)
Stock issued pursuant to employee stock plans, (in shares)		55
Stock-based compensation	5,640		5,640
Balance at Mar. 31, 2020	$ 936,379	$ 365	$ 949,916	$ 733		$ (14,635)
Balance (in shares) at Mar. 31, 2020		36,458