Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jul. 07, 2010
Commitments and Contingencies Disclosure [Line Items]
Jury returned a verdict for breach of contract, awarding plaintiff damages		$ 269.4
Stipulation with plaintiff on prejudgment interest award		50
Reduction in unrecognized tax benefits from settlements with state and federal taxing authorities	64
Unrecognized tax benefits expected reduction due to resolutions of open tax matters	52
Broadcast Programming
Commitments and Contingencies Disclosure [Line Items]
Long-term receivables, net of allowance for credit losses	800
Mortgage Receivable
Commitments and Contingencies Disclosure [Line Items]
Long-term receivables, net of allowance for credit losses	500
Allowance for credit losses related to long-term receivables, percentage	5.00%
Guarantee Obligations
Commitments and Contingencies Disclosure [Line Items]
Guaranteed obligations	359
Remaining debt service obligation guaranteed, principal	87
Financial Guarantee
Commitments and Contingencies Disclosure [Line Items]
Guaranteed obligations	$ 700