Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Millions				3 Months Ended		12 Months Ended
	Jul. 27, 2016	Jul. 02, 2016	Feb. 16, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net (loss) income						$ 30	$ (88)	$ (303)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization						293	309	321
Unrealized gains/losses and remeasurement of foreign denominated loans							28	(39)
Deferred income taxes						(26)	(11)	(55)
Loss on extinguishment of debt				$ 14	$ 4	18		141
Net gain on divestitures						(9)		(2)
Gain on sale of real estate						(24)
Non-cash interest expense						11	11	13
Non-cash share-based compensation expense						23	3	8
Gain on sale of assets								(2)
Changes in operating assets and liabilities:
Accounts receivable						17	6	72
Inventories							(6)	(7)
Royalty advances						(13)	(46)	(32)
Accounts payable and accrued liabilities						23	(17)	(87)
Royalty payables						49	27	25
Accrued interest						(20)	(2)	(15)
Deferred revenue						(35)	12	95
Other balance sheet changes						5	(4)	(5)
Net cash provided by operating activities						342	222	130
Cash flows from investing activities
Acquisition of music publishing rights, net						(25)	(16)	(26)
Capital expenditures						(42)	(63)	(76)
Investments and acquisitions of businesses, net						(28)	(16)	(53)
Divestitures, net of cash on hand						45
Proceeds from the sale of real estate						42
Net cash used in investing activities						(8)	(95)	(155)
Cash flows from financing activities
Proceeds from the Revolving Credit Facility							258	600
Repayment of the Revolving Credit Facility							(258)	(600)
Repayment of Acquisition Corp. Senior Term Loan Facility						(309)	(13)	(10)
Financing costs paid						(10)		(104)
Deferred financing costs paid						(4)		(13)
Distribution to noncontrolling interest holder						(5)	(3)	(3)
Repayment of capital lease obligations						(14)	(3)	(3)
Net cash used in financing activities						(216)	(19)	37
Effect of exchange rate changes on cash and equivalents						(5)	(19)	(10)
Net increase in cash and equivalents						113	89	2
Cash and equivalents at beginning of period						246	157	155
Cash and equivalents at end of period				359		359	246	157
Eliminations
Cash flows from operating activities
Net (loss) income						(216)	60	(50)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity losses (gains), including distributions						236	(32)	33
Changes in operating assets and liabilities:
Accounts payable and accrued liabilities						(20)	(28)
Other balance sheet changes								15
Net cash provided by operating activities								(2)
Cash flows from investing activities
Advance to Issuer						(329)	(110)	(58)
Net cash used in investing activities						(329)	(110)	(58)
Cash flows from financing activities
Change in due to (from) issuer						329	110	60
Net cash used in financing activities						329	110	60
Eliminations
Cash flows from operating activities
Net (loss) income						(78)	160	594
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity losses (gains), including distributions						78	(160)	(594)
5.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp						300
13.75% Senior Notes due 2019
Cash flows from financing activities
Repayment of Senior Notes						(150)
6.750% Senior Notes
Cash flows from financing activities
Repayment of Senior Notes						(24)
Proceeds from issuance of Acquisition Corp Senior Notes								660
5.625% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp								275
11.5% Senior Notes
Cash flows from financing activities
Repayment of Senior Notes								(765)
Repayment of Acquisition Corp. Senior Notes								(765)
WMG Acquisition Corp.
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss on extinguishment of debt	$ (4)
WMG Acquisition Corp. | Reportable Legal Entities
Cash flows from operating activities
Net (loss) income						53	(69)	(286)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization							(1)
Unrealized gains/losses and remeasurement of foreign denominated loans							21	(12)
Loss on extinguishment of debt						4		141
Non-cash interest expense						10	10	12
Equity losses (gains), including distributions						(162)	(35)	80
Changes in operating assets and liabilities:
Accrued interest						(10)	(2)	(15)
Other balance sheet changes						(4)
Net cash provided by operating activities						(109)	(76)	(80)
Cash flows from investing activities
Advance to Issuer						329	110	58
Net cash used in investing activities						329	110	58
Cash flows from financing activities
Dividend by Acquisition Corp. to Holdings Corp.						(183)	(21)	(21)
Proceeds from the Revolving Credit Facility							258	600
Repayment of the Revolving Credit Facility							(258)	(600)
Repayment of Acquisition Corp. Senior Term Loan Facility						(309)	(13)	(10)
Financing costs paid								(104)
Deferred financing costs paid						(4)		(13)
Net cash used in financing activities						(220)	(34)	22
WMG Acquisition Corp. | 5.00% Senior Secured Notes | Reportable Legal Entities
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp						300
WMG Acquisition Corp. | 6.750% Senior Notes | Reportable Legal Entities
Cash flows from financing activities
Repayment of Senior Notes						(24)
Proceeds from issuance of Acquisition Corp Senior Notes								660
WMG Acquisition Corp. | 5.625% Senior Secured Notes | Reportable Legal Entities
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp								275
WMG Acquisition Corp. | 11.5% Senior Notes | Reportable Legal Entities
Cash flows from financing activities
Repayment of Acquisition Corp. Senior Notes								(765)
Guarantor Subsidiaries | Reportable Legal Entities
Cash flows from operating activities
Net (loss) income						167	(42)	201
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization						156	162	160
Unrealized gains/losses and remeasurement of foreign denominated loans							55	(23)
Net gain on divestitures						(3)
Non-cash share-based compensation expense						23	3	8
Equity losses (gains), including distributions						(74)	67	(113)
Gain on sale of assets								(2)
Changes in operating assets and liabilities:
Accounts receivable						(7)	4	10
Inventories							(1)	(3)
Royalty advances						1	(23)	(9)
Accounts payable and accrued liabilities						142	26	(162)
Royalty payables						93	(19)	(38)
Deferred revenue						(4)	(9)	107
Other balance sheet changes						(10)	3	2
Net cash provided by operating activities						484	226	138
Cash flows from investing activities
Acquisition of music publishing rights, net						(16)	(9)	(16)
Capital expenditures						(30)	(48)	(53)
Investments and acquisitions of businesses, net						(10)	(11)	2
Divestitures, net of cash on hand						8
Net cash used in investing activities						(48)	(68)	(67)
Cash flows from financing activities
Distribution to noncontrolling interest holder							(1)	(1)
Change in due to (from) issuer						(329)	(110)	(60)
Net cash used in financing activities						(329)	(111)	(61)
Net increase in cash and equivalents						107	47	10
Cash and equivalents at beginning of period						73	26	16
Cash and equivalents at end of period				180		180	73	26
Non-Guarantor Subsidiaries | Reportable Legal Entities
Cash flows from operating activities
Net (loss) income						54	(15)	(146)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization						137	148	161
Unrealized gains/losses and remeasurement of foreign denominated loans							(48)	(4)
Deferred income taxes						(26)	(11)	(55)
Net gain on divestitures						(6)
Gain on sale of real estate						(24)
Changes in operating assets and liabilities:
Accounts receivable						24	2	62
Inventories							(5)	(4)
Royalty advances						(14)	(23)	(23)
Accounts payable and accrued liabilities						(99)	(15)	75
Royalty payables						(44)	46	63
Deferred revenue						(31)	21	(12)
Other balance sheet changes						19	(7)	(22)
Net cash provided by operating activities						(10)	93	95
Cash flows from investing activities
Acquisition of music publishing rights, net						(9)	(7)	(10)
Capital expenditures						(12)	(15)	(23)
Investments and acquisitions of businesses, net						(18)	(5)	(55)
Divestitures, net of cash on hand						37
Proceeds from the sale of real estate						42
Net cash used in investing activities						40	(27)	(88)
Cash flows from financing activities
Distribution to noncontrolling interest holder						(5)	(2)	(2)
Repayment of capital lease obligations						(14)	(3)	(3)
Net cash used in financing activities						(19)	(5)	(5)
Effect of exchange rate changes on cash and equivalents						(5)	(19)	(10)
Net increase in cash and equivalents						6	42	(8)
Cash and equivalents at beginning of period						173	131	139
Cash and equivalents at end of period				179		179	173	131
WMG Acquisition Corp. Consolidated | Reportable Legal Entities
Cash flows from operating activities
Net (loss) income						58	(66)	(281)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization						293	309	321
Unrealized gains/losses and remeasurement of foreign denominated loans							28	(39)
Deferred income taxes						(26)	(11)	(55)
Loss on extinguishment of debt						4		141
Net gain on divestitures						(9)
Gain on sale of real estate						(24)
Non-cash interest expense						10	10	12
Non-cash share-based compensation expense						23	3	8
Gain on sale of assets								(2)
Changes in operating assets and liabilities:
Accounts receivable						17	6	72
Inventories							(6)	(7)
Royalty advances						(13)	(46)	(32)
Accounts payable and accrued liabilities						23	(17)	(87)
Royalty payables						49	27	25
Accrued interest						(10)	(2)	(15)
Deferred revenue						(35)	12	95
Other balance sheet changes						5	(4)	(5)
Net cash provided by operating activities						365	243	151
Cash flows from investing activities
Acquisition of music publishing rights, net						(25)	(16)	(26)
Capital expenditures						(42)	(63)	(76)
Investments and acquisitions of businesses, net						(28)	(16)	(53)
Divestitures, net of cash on hand						45
Proceeds from the sale of real estate						42
Net cash used in investing activities						(8)	(95)	(155)
Cash flows from financing activities
Dividend by Acquisition Corp. to Holdings Corp.						(183)	(21)	(21)
Proceeds from the Revolving Credit Facility							258	600
Repayment of the Revolving Credit Facility							(258)	(600)
Repayment of Acquisition Corp. Senior Term Loan Facility						(309)	(13)	(10)
Financing costs paid								(104)
Deferred financing costs paid						(4)		(13)
Distribution to noncontrolling interest holder						(5)	(3)	(3)
Repayment of capital lease obligations						(14)	(3)	(3)
Net cash used in financing activities						(239)	(40)	16
Effect of exchange rate changes on cash and equivalents						(5)	(19)	(10)
Net increase in cash and equivalents						113	89	2
Cash and equivalents at beginning of period						246	157	155
Cash and equivalents at end of period				$ 359		359	246	157
WMG Acquisition Corp. Consolidated | 5.00% Senior Secured Notes | Reportable Legal Entities
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp						300
WMG Acquisition Corp. Consolidated | 6.750% Senior Notes | Reportable Legal Entities
Cash flows from financing activities
Repayment of Senior Notes						(24)
Proceeds from issuance of Acquisition Corp Senior Notes								660
WMG Acquisition Corp. Consolidated | 5.625% Senior Secured Notes | Reportable Legal Entities
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp								275
WMG Acquisition Corp. Consolidated | 11.5% Senior Notes | Reportable Legal Entities
Cash flows from financing activities
Repayment of Acquisition Corp. Senior Notes								(765)
WMG Holdings Corp. | Reportable Legal Entities
Cash flows from operating activities
Net (loss) income						25	(91)	(308)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss on extinguishment of debt						14
Non-cash interest expense						1	1	1
Equity losses (gains), including distributions						(53)	69	286
Changes in operating assets and liabilities:
Accrued interest						(10)
Net cash provided by operating activities						(23)	(21)	(21)
Cash flows from financing activities
Dividend by Acquisition Corp. to Holdings Corp.						183	21	21
Financing costs paid						(10)
Net cash used in financing activities						23	21	21
WMG Holdings Corp. | 13.75% Senior Notes due 2019
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss on extinguishment of debt		$ 10	$ 5
Cash flows from financing activities
Repayment of Senior Notes		$ (100)	$ (50)
WMG Holdings Corp. | 13.75% Senior Notes due 2019 | Reportable Legal Entities
Cash flows from financing activities
Repayment of Senior Notes						(150)
Warner Music Group Corp. | Reportable Legal Entities
Cash flows from operating activities
Net (loss) income						25	(91)	(308)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity losses (gains), including distributions						$ (25)	$ 91	$ 308