Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 210
Ending balance	140
Foreign Currency Translation Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(201)	[1]
Other comprehensive loss	(37)	[1]
Ending balance	(238)	[1]
Minimum Pension Liability Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(17)
Ending balance	(17)
Deferred Losses On Derivative Financial Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss	(2)
Ending balance	(2)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(218)
Other comprehensive loss	(39)
Ending balance	$ (257)

[1] Foreign currency translation adjustments include intra-entity foreign currency transactions that are of a long-term investment nature of $38.9 million.