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Stock-Based Compensation - Schedule of Restricted Stock Units Award Activity (Details) (USD $)	3 Months Ended	6 Months Ended
	Mar. 27, 2014	Sep. 30, 2014	Mar. 31, 2014
CBS Corp. Equity and Incentive Plan | Restricted Stock Units (RSUs)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Non-Vested, Beginning Balance (USD per share)	$ 32.09	$ 36.80	$ 33.16	[1]
Weighted Average Grant Date Fair Value, Grants in Period (USD per share)	$ 34.66
Weighted Average Grant Date Fair Value, Vested (USD per share)	$ 22.51	$ 33.16
Weighted Average Grant Date Fair Value, Forfeited (USD per share)	$ 37.67
Weighted Average Grant Date Fair Value, Non-Vested, Ending Balance (USD per share)	$ 36.80	$ 0.00	$ 33.16	[1]
Weighted Average Grant Date Fair Value, Converted Awards (USD per share)	$ 37.77
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Non-vested as of beginning of period	472,490	323,733
Employee transfers and grants	11,875
Vested	(157,723)	(67,561)
Forfeited	(2,909)
Non-vested of end of period	323,733	0
CBS RSUs converted to Outdoor RSUs	(256,172)
CBS RSU's not converted			67,561	[1]
Omnibus Stock Incentive Plan | Restricted Stock Units (RSUs)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Grants in Period (USD per share)		$ 29.59
Weighted Average Grant Date Fair Value, Vested (USD per share)		$ 25.91
Weighted Average Grant Date Fair Value, Forfeited (USD per share)		$ 24.39
Weighted Average Grant Date Fair Value, Converted Awards (USD per share)	$ 17.24
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Non-vested Outdoor RSUs converted from CBS RSUs	561,021
Employee transfers and grants		478,311
Vested		(5,848)
Forfeited		(27,965)
Omnibus Stock Incentive Plan | Performance Restricted Stock Units (PRSUs)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Grants in Period (USD per share)		$ 29.70
Weighted Average Grant Date Fair Value, Vested (USD per share)		$ 25.88
Weighted Average Grant Date Fair Value, Forfeited (USD per share)		$ 26.39
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Employee transfers and grants		168,468
Vested		(6,955)
Forfeited		(15,289)
Omnibus Stock Incentive Plan | RSUs and PRSUs
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Non-Vested, Ending Balance (USD per share)		$ 23.78
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Non-vested of end of period		1,151,743
RSUs and PRSUs | Omnibus Stock Incentive Plan
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Non-vested of end of period		10,030
Dividend equivalents		10,032
Share Based Compensation By Share Based Payment Award Equity Instrument Other Than Options Dividends Forfeited In Period		(2)
[1] Reflects CBS RSUs which vested in April 2014.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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