Film and Television Costs and Advances - Additional Information (Detail) $ in Millions	12 Months Ended
	Sep. 30, 2017 USD ($)
Disclosure Film And Television Costs [Abstract]
Percentage of unamortized film and television costs for released productions expected to be amortized during the next three years	76.00%
The period required to reach an amortization level of 80 percent for unamortized film costs that is expected to be amortize within three years from the date of the balance sheet	By the end of fiscal 2021, we will have reached on a cumulative basis, 80% amortization of the September 30, 2017 balance of unamortized film and television costs.
Accrued participation and residual liabilities to be paid in fiscal year 2018	$ 1,000
Expected amortization of capitalized film and television production costs during fiscal 2018	1,300
Unamortized Acquired Film And Television Libraries	$ 175
Weighted Average Remaining Amortization Period	14 years