FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Notional amount of foreign exchange contracts outstanding	$ 126,000,000	$ 190,000,000	$ 137,000,000
Foreign Exchange Forward
Derivative [Line Items]
Term of derivative contract	18 years
India, Rupees | Foreign Currency Option Contracts
Derivative [Line Items]
Notional amount of foreign exchange contracts outstanding	$ 172,000,000	174,000,000
Euro Member Countries, Euro | Foreign Currency Option Contracts
Derivative [Line Items]
Notional amount of foreign exchange contracts outstanding	58,000,000	0
Sweden, Kronor | Foreign Currency Option Contracts
Derivative [Line Items]
Notional amount of foreign exchange contracts outstanding	$ 71,000,000	$ 0