Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net (loss) income	$ (95)	$ (75)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt		83
Depreciation and amortization	157	120
Deferred income taxes	(23)	(12)
Non-cash interest expense	8	6
Equity (gains) losses
Non-cash share-based compensation expense	3	4
Changes in operating assets and liabilities:
Accounts receivable	118	64
Inventories	(2)	2
Royalty advances	(28)	(10)
Accounts payable and accrued liabilities	(121)	(74)
Royalty payables	(9)	12
Accrued interest		(13)
Deferred revenue	128	46
Other balance sheet changes	(57)	(28)
Net cash (used in) provided by operating activities	79	125
Cash flows from investing activities
Acquisition of music publishing rights	(19)	(11)
Investments and acquisitions of businesses	(26)	(5)
Capital expenditures	(30)	(13)
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities	(75)	(29)
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.
Proceeds from the Revolving Credit Facility	230	31
Repayment of the Revolving Credit Facility	(230)	(31)
Amortization of Senior Term Loan Facility	(3)	(8)
Repayment of capital lease obligations	(1)
Distributions to noncontrolling interest holder	(1)
Change in due (from) to issuer
Net cash (used in) provided by financing activities	(5)	(97)
Proceeds from Acquisition Corp Senior Term Loan Facility		594
Financing costs paid		(127)
Deferred financing costs paid		(33)
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash	(5)	(7)
Net (decrease) increase in cash and equivalents	(6)	(8)
Cash and equivalents at beginning of period	155	302
Cash and equivalents at end of period	149	294
6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		500
6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		227
9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes		(1,250.0)
Eliminations
Cash flows from operating activities
Net (loss) income	62	(62)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt
Depreciation and amortization
Deferred income taxes
Non-cash interest expense
Equity (gains) losses	(64)	52
Non-cash share-based compensation expense
Changes in operating assets and liabilities:
Accounts receivable
Inventories
Royalty advances
Accounts payable and accrued liabilities	8	16
Royalty payables
Accrued interest
Deferred revenue
Other balance sheet changes	(6)	(6)
Net cash (used in) provided by operating activities
Cash flows from investing activities
Acquisition of music publishing rights
Investments and acquisitions of businesses
Capital expenditures
Change in due to (from) subsidiaries	(36)	(195)
Net cash (used in) provided by investing activities	(36)	(195)
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.
Proceeds from the Revolving Credit Facility
Repayment of the Revolving Credit Facility
Amortization of Senior Term Loan Facility
Repayment of capital lease obligations
Distributions to noncontrolling interest holder
Change in due (from) to issuer	36	(195)
Net cash (used in) provided by financing activities	36	195
Proceeds from Acquisition Corp Senior Term Loan Facility
Financing costs paid
Deferred financing costs paid
Change in due to (from) to issuer	(36)	195
Effect of foreign currency exchange rate changes on cash
Net (decrease) increase in cash and equivalents
Cash and equivalents at beginning of period
Cash and equivalents at end of period
Eliminations | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Eliminations | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Eliminations | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes
Eliminations
Cash flows from operating activities
Net (loss) income	183	145
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt
Depreciation and amortization
Deferred income taxes
Non-cash interest expense
Equity (gains) losses	(183)	(145)
Non-cash share-based compensation expense
Changes in operating assets and liabilities:
Accounts receivable
Inventories
Royalty advances
Accounts payable and accrued liabilities
Royalty payables
Accrued interest
Deferred revenue
Other balance sheet changes
Net cash (used in) provided by operating activities
Cash flows from investing activities
Acquisition of music publishing rights
Investments and acquisitions of businesses
Capital expenditures
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.
Proceeds from the Revolving Credit Facility
Repayment of the Revolving Credit Facility
Amortization of Senior Term Loan Facility
Distributions to noncontrolling interest holder
Change in due (from) to issuer
Net cash (used in) provided by financing activities
Proceeds from Acquisition Corp Senior Term Loan Facility
Financing costs paid
Deferred financing costs paid
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash
Net (decrease) increase in cash and equivalents
Cash and equivalents at beginning of period
Cash and equivalents at end of period
Eliminations | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Eliminations | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Eliminations | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes
WMG Acquisition Corp. (issuer)
Cash flows from operating activities
Net (loss) income	(86)	(67)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt		83
Depreciation and amortization
Deferred income taxes
Non-cash interest expense	7	5
Equity (gains) losses	53	(97)
Non-cash share-based compensation expense
Changes in operating assets and liabilities:
Accounts receivable		(1)
Inventories
Royalty advances
Accounts payable and accrued liabilities
Royalty payables
Accrued interest		(13)
Deferred revenue
Other balance sheet changes	3	2
Net cash (used in) provided by operating activities	(23)	(88)
Cash flows from investing activities
Acquisition of music publishing rights
Investments and acquisitions of businesses
Capital expenditures
Change in due to (from) subsidiaries	36	195
Net cash (used in) provided by investing activities	36	195
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.	(10)	(12)
Proceeds from the Revolving Credit Facility	230	31
Repayment of the Revolving Credit Facility	(230)	(31)
Amortization of Senior Term Loan Facility	(3)	(8)
Repayment of capital lease obligations
Distributions to noncontrolling interest holder
Change in due (from) to issuer
Net cash (used in) provided by financing activities	(13)	(107)
Proceeds from Acquisition Corp Senior Term Loan Facility		594
Financing costs paid		(127)
Deferred financing costs paid		(31)
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash
Net (decrease) increase in cash and equivalents
Cash and equivalents at beginning of period		44
Cash and equivalents at end of period		44
WMG Acquisition Corp. (issuer) | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		500
WMG Acquisition Corp. (issuer) | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		227
WMG Acquisition Corp. (issuer) | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes		(1,250.0)
Guarantor Subsidiaries
Cash flows from operating activities
Net (loss) income	82	26
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt
Depreciation and amortization	77	77
Deferred income taxes
Non-cash interest expense
Equity (gains) losses	11	45
Non-cash share-based compensation expense	3	4
Changes in operating assets and liabilities:
Accounts receivable	41	(7)
Inventories	1	1
Royalty advances	(3)	(18)
Accounts payable and accrued liabilities	(187)	31
Royalty payables	(38)	30
Accrued interest
Deferred revenue	115	27
Other balance sheet changes	(10)	(10)
Net cash (used in) provided by operating activities	92	206
Cash flows from investing activities
Acquisition of music publishing rights	(13)	(8)
Investments and acquisitions of businesses	(10)	(5)
Capital expenditures	(22)	(9)
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities	(45)	(22)
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.
Proceeds from the Revolving Credit Facility
Repayment of the Revolving Credit Facility
Amortization of Senior Term Loan Facility
Repayment of capital lease obligations
Distributions to noncontrolling interest holder
Change in due (from) to issuer	(36)	195
Net cash (used in) provided by financing activities	(36)	(195)
Proceeds from Acquisition Corp Senior Term Loan Facility
Financing costs paid
Deferred financing costs paid
Change in due to (from) to issuer	36	(195)
Effect of foreign currency exchange rate changes on cash
Net (decrease) increase in cash and equivalents	11	(11)
Cash and equivalents at beginning of period	16	105
Cash and equivalents at end of period	27	94
Guarantor Subsidiaries | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Guarantor Subsidiaries | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Guarantor Subsidiaries | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes
Non-Guarantor Subsidiaries
Cash flows from operating activities
Net (loss) income	(142)	39
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt
Depreciation and amortization	80	43
Deferred income taxes	(23)	(12)
Non-cash interest expense
Equity (gains) losses
Non-cash share-based compensation expense
Changes in operating assets and liabilities:
Accounts receivable	77	72
Inventories	(3)	1
Royalty advances	(25)	8
Accounts payable and accrued liabilities	58	(121)
Royalty payables	29	(18)
Accrued interest
Deferred revenue	13	19
Other balance sheet changes	(44)	(14)
Net cash (used in) provided by operating activities	20	17
Cash flows from investing activities
Acquisition of music publishing rights	(6)	(3)
Investments and acquisitions of businesses	(16)
Capital expenditures	(8)	(4)
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities	(30)	(7)
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.
Proceeds from the Revolving Credit Facility
Repayment of the Revolving Credit Facility
Amortization of Senior Term Loan Facility
Repayment of capital lease obligations	(1)
Distributions to noncontrolling interest holder	(1)
Change in due (from) to issuer
Net cash (used in) provided by financing activities	(2)
Proceeds from Acquisition Corp Senior Term Loan Facility
Financing costs paid
Deferred financing costs paid
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash	(5)	(7)
Net (decrease) increase in cash and equivalents	(17)	3
Cash and equivalents at beginning of period	139	143
Cash and equivalents at end of period	122	146
Non-Guarantor Subsidiaries | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Non-Guarantor Subsidiaries | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Non-Guarantor Subsidiaries | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes
WMG Acquisition Corp. Consolidated
Cash flows from operating activities
Net (loss) income	(84)	(64)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt		83
Depreciation and amortization	157	120
Deferred income taxes	(23)	(12)
Non-cash interest expense	7	5
Equity (gains) losses
Non-cash share-based compensation expense	3	4
Changes in operating assets and liabilities:
Accounts receivable	118	64
Inventories	(2)	2
Royalty advances	(28)	(10)
Accounts payable and accrued liabilities	(121)	(74)
Royalty payables	(9)	12
Accrued interest		(13)
Deferred revenue	128	46
Other balance sheet changes	(57)	(28)
Net cash (used in) provided by operating activities	89	135
Cash flows from investing activities
Acquisition of music publishing rights	(19)	(11)
Investments and acquisitions of businesses	(26)	(5)
Capital expenditures	(30)	(13)
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities	(75)	(29)
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.	(10)	(12)
Proceeds from the Revolving Credit Facility	230	31
Repayment of the Revolving Credit Facility	(230)	(31)
Amortization of Senior Term Loan Facility	(3)	(8)
Repayment of capital lease obligations	(1)
Distributions to noncontrolling interest holder	(1)
Change in due (from) to issuer
Net cash (used in) provided by financing activities	(15)	(107)
Proceeds from Acquisition Corp Senior Term Loan Facility		594
Financing costs paid		(127)
Deferred financing costs paid		(31)
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash	(5)	(7)
Net (decrease) increase in cash and equivalents	(6)	(8)
Cash and equivalents at beginning of period	155	292
Cash and equivalents at end of period	149	284
WMG Acquisition Corp. Consolidated | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		500
WMG Acquisition Corp. Consolidated | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp		227
WMG Acquisition Corp. Consolidated | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes		(1,250.0)
WMG Holdings Corp. (issuer)
Cash flows from operating activities
Net (loss) income	(97)	(78)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt
Depreciation and amortization
Deferred income taxes
Non-cash interest expense	1	1
Equity (gains) losses	86	67
Non-cash share-based compensation expense
Changes in operating assets and liabilities:
Accounts receivable
Inventories
Royalty advances
Accounts payable and accrued liabilities
Royalty payables
Accrued interest
Deferred revenue
Other balance sheet changes
Net cash (used in) provided by operating activities	(10)	(10)
Cash flows from investing activities
Acquisition of music publishing rights
Investments and acquisitions of businesses
Capital expenditures
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.	10	12
Proceeds from the Revolving Credit Facility
Repayment of the Revolving Credit Facility
Amortization of Senior Term Loan Facility
Distributions to noncontrolling interest holder
Change in due (from) to issuer
Net cash (used in) provided by financing activities	10	10
Proceeds from Acquisition Corp Senior Term Loan Facility
Financing costs paid
Deferred financing costs paid		(2)
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash
Net (decrease) increase in cash and equivalents
Cash and equivalents at beginning of period		10
Cash and equivalents at end of period		10
WMG Holdings Corp. (issuer) | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
WMG Holdings Corp. (issuer) | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
WMG Holdings Corp. (issuer) | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes
Warner Music Group Corp.
Cash flows from operating activities
Net (loss) income	(97)	(78)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of debt
Depreciation and amortization
Deferred income taxes
Non-cash interest expense
Equity (gains) losses	97	78
Non-cash share-based compensation expense
Changes in operating assets and liabilities:
Accounts receivable
Inventories
Royalty advances
Accounts payable and accrued liabilities
Royalty payables
Accrued interest
Deferred revenue
Other balance sheet changes
Net cash (used in) provided by operating activities
Cash flows from investing activities
Acquisition of music publishing rights
Investments and acquisitions of businesses
Capital expenditures
Change in due to (from) subsidiaries
Net cash (used in) provided by investing activities
Cash flows from financing activities
Dividend by Acquisition Corp.to Holdings Corp.
Proceeds from the Revolving Credit Facility
Repayment of the Revolving Credit Facility
Amortization of Senior Term Loan Facility
Distributions to noncontrolling interest holder
Change in due (from) to issuer
Net cash (used in) provided by financing activities
Proceeds from Acquisition Corp Senior Term Loan Facility
Financing costs paid
Deferred financing costs paid
Change in due to (from) to issuer
Effect of foreign currency exchange rate changes on cash
Net (decrease) increase in cash and equivalents
Cash and equivalents at beginning of period
Cash and equivalents at end of period
Warner Music Group Corp. | 6.00% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Warner Music Group Corp. | 6.25% Senior Secured Notes
Cash flows from financing activities
Proceeds from issuance of Acquisition Corp
Warner Music Group Corp. | 9.5% Senior Secured Notes
Cash flows from financing activities
Repayment of Acquisition Corp Senior Secured Notes