Long-Term Debt (Details Textuals)	9 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 20, 2015 USD ($)	May. 22, 2015 USD ($)	Feb. 13, 2015 USD ($)	Sep. 30, 2014 USD ($)	Feb. 21, 2014 USD ($)
Debt Instrument [Line Items]
Outstanding capital lease obligations	$ 21,000,000				$ 26,000,000
Financing Arrangements For Capital Leases
Debt Instrument [Line Items]
Maximum amount of progress payments for equipment under construction	$ 10,000,000
Capital Lease Arrangements
Debt Instrument [Line Items]
Capital leases term	60 months
Outstanding capital lease obligations	$ 11,000,000				13,000,000
Other Capital Lease Arrangements
Debt Instrument [Line Items]
Outstanding capital lease obligations	$ 10,000,000				13,000,000
30-Day LIBOR | Capital Lease Arrangements
Debt Instrument [Line Items]
Basis spread on variable rate	4.75%
Five-Year Swap Rate | Financing Arrangements For Capital Leases
Debt Instrument [Line Items]
Basis spread on variable rate	5.64%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 499,000,000	$ 499,000,000
Borrowings outstanding	$ 0				0
Amount of letters of credit outstanding	$ 0				0
Revolving Credit Facility | Triggering Event One
Debt Instrument [Line Items]
Ratio of total priority debt to EBITDA through period end	2.25
Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%
Unused capacity, commitment fee percentage	0.50%
Standby Letters of Credit
Debt Instrument [Line Items]
Maximum limit on the issuance of letters of credit						$ 30,000,000
Amount of letters of credit outstanding	$ 25,000,000				25,000,000
Standby Letters of Credit | Scenario, Forecast
Debt Instrument [Line Items]
Maximum limit on the issuance of letters of credit		$ 25,000,000
Revolving Credit Facility - Amended - Matures In April 2017 | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			40,000,000	89,000,000
Revolving Credit Facility - Amended - Matures In February 2019 | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 459,000,000	$ 410,000,000
Amended Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum collateral test value	1.0
Value of company assets collateralized	$ 633,000,000
Maximum limit on the issuance of letters of credit	$ 100,000,000
Overnight Revolving Credit Loans | Revolving Credit Facility | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Other Letters of Credit Arrangements
Debt Instrument [Line Items]
Amount of letters of credit outstanding	$ 7,000,000				9,000,000
Other Borrowings
Debt Instrument [Line Items]
Long-term debt outstanding	$ 23,000,000				31,000,000
BRAZIL | Export Financing Arrangement | Note payable
Debt Instrument [Line Items]
Long-term debt outstanding					29,000,000
Interest rate	5.50%
INDIA | Export Financing Arrangement | Note payable
Debt Instrument [Line Items]
Long-term debt outstanding	$ 0				2,000,000
CHINA | Other Export Financing Arrangements | Notes Payable to Banks
Debt Instrument [Line Items]
Long-term debt outstanding	14,000,000				$ 32,000,000
Debt default, amount	$ 35,000,000