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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Changes In Carrying Amount Of Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Goodwill
Beginning balance	$ 2,145,935,000	$ 3,325,622,000		$ 2,145,935,000	$ 3,325,622,000
Impairment	0	(1,200,000,000)	$ 0		(1,224,374,000)
Acquisitions				169,491,000	44,606,000
Dispositions				(1,446,000)	(164,000)
Foreign currency				(156,000)	245,000
Ending balance			2,313,824,000	2,313,824,000	2,145,935,000
Audio
Goodwill
Beginning balance	2,041,536,000	3,221,468,000		2,041,536,000	3,221,468,000
Impairment					(1,224,374,000)
Acquisitions					44,606,000
Dispositions					(164,000)
Foreign currency					0
Ending balance					2,041,536,000
Audio & Media Services Group
Goodwill
Beginning balance	104,399,000	$ 104,154,000		104,399,000	104,154,000
Impairment					0
Acquisitions				0	0
Dispositions				0	0
Foreign currency				(156,000)	245,000
Ending balance			104,243,000	104,243,000	104,399,000
Multiplatform Group
Goodwill
Beginning balance	1,462,217,000			1,462,217,000
Acquisitions				1,267,000
Dispositions				(1,446,000)
Foreign currency				0
Ending balance			1,462,038,000	1,462,038,000	1,462,217,000
Digital Audio Group
Goodwill
Beginning balance	$ 579,319,000			579,319,000
Acquisitions				168,224,000
Dispositions				0
Foreign currency				0
Ending balance			$ 747,543,000	$ 747,543,000	$ 579,319,000

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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