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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule of Goodwill (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Beginning balance	$ 2,145,935,000	$ 3,325,622,000		$ 2,145,935,000	$ 3,325,622,000
Goodwill, Impairment Loss	0	(1,200,000,000)	$ 0		(1,224,374,000)
Acquisitions				169,298,000	44,606,000
Dispositions				(1,446,000)	(164,000)
Foreign currency				(206,000)	245,000
Ending balance			2,145,935,000	2,313,581,000	2,145,935,000
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			1,462,217,000	1,462,038,000	1,462,217,000
Digital Audio Group
Goodwill
Beginning balance	579,319,000			579,319,000
Acquisitions				168,031,000
Dispositions				0
Foreign currency				0
Ending balance			579,319,000	747,350,000	579,319,000
Audio & Media Services Group
Goodwill
Beginning balance	104,399,000			104,399,000
Acquisitions				0
Dispositions				0
Foreign currency				(206,000)
Ending balance			104,399,000	104,193,000	104,399,000
Audio
Goodwill
Beginning balance	2,041,536,000	3,221,468,000		2,041,536,000	3,221,468,000
Goodwill, Impairment Loss					(1,224,374,000)
Acquisitions					44,606,000
Dispositions					(164,000)
Foreign currency					0
Ending balance			2,041,536,000		2,041,536,000
Audio & Media Services Group
Goodwill
Beginning balance	$ 104,399,000	$ 104,154,000		$ 104,399,000	104,154,000
Goodwill, Impairment Loss					0
Acquisitions					0
Dispositions					0
Foreign currency					245,000
Ending balance			$ 104,399,000		$ 104,399,000

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