Subsequent Events	3 Months Ended
Subsequent Events	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events January 2024 Senior Term Loan Credit Agreement Amendment On January 24, 2024, Acquisition Corp. entered into an amendment (the “Fourteenth Amendment”) to the credit agreement, dated November 1, 2012, as amended or supplemented, among Acquisition Corp., the guarantors party thereto, the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent, governing Acquisition Corp.’s senior secured term loan facility with JPMorgan Chase Bank N.A., as administrative agent, and the other financial institutions and lenders from time to time party thereto. The Fourteenth Amendment (among other changes) extended the maturity date of its outstanding term loans from January 20, 2028 to January 24, 2031 through the issuance of tranche I term loans and refinancing of the existing tranche G term loans. The tranche I term loans shall bear interest at a rate equal to, at Acquisition Corp.’s election (i) the forward-looking term rate based on Term SOFR as administered by the Federal Reserve Bank of New York for the applicable interest period subject to a zero floor, plus 2.000% per annum or (ii) the base rate, which is the highest of (x) the corporate base rate established by the administrative agent as its prime rate in effect at its principal office in New York City from time to time, (y) 0.50% in excess of the overnight federal funds rate and (z) one-month Term SOFR, plus 1.00% per annum, in each case, subject to a 1.00% floor, plus 1.000% per annum. Strategic Restructuring Plan On February 6, 2024, the Company’s board of directors approved and the Company subsequently announced a strategic restructuring plan (the “Strategic Restructuring Plan”) designed to free up more funds to invest in music and accelerate the Company's growth for the next decade. The Company expects the Strategic Restructuring Plan to generate pre-tax cost savings by the end of fiscal year 2025 and anticipates allocating a majority of the cost savings to increase investment in the Company’s core Recorded Music and Music Publishing businesses, new skill sets and tech capabilities. The cost savings under the Strategic Restructuring Plan will be achieved through a combination of the disposal or winding down of certain of the Company’s non-core owned and operated media properties including the Company’s in-house ad sales function (the “O&O Media Properties”), continuing to manage overhead, sharpening focus, expanding shared services, and implementing previously disclosed expected operational efficiencies made possible by the Company’s financial transformation initiative. The Strategic Restructuring Plan anticipates a reduction in headcount, a majority of which will be related to the O&O Media Properties, Corporate and various support functions. The Strategic Restructuring Plan is expected to result in approximately $140 million of total non-recurring pre-tax charges and approximately $105 million in total after tax charges. The pre-tax charges include approximately $85 million representing severance payments and other related termination costs, and approximately $55 million represents non-cash impairment charges primarily in connection with the disposal or winding down of the O&O Media Properties. The majority of the charges associated with the Strategic Restructuring Plan are expected to be incurred by the end of fiscal year 2024 and the actions related to those charges will commence immediately. The severance payments and other termination costs are expected to be paid by the end of fiscal year 2026 with approximately $35 million of those payments and costs expected to be paid by the end of fiscal year 2024.