Long-Term Debt (Details Textuals) (USD $)	6 Months Ended		0 Months Ended
	Mar. 31, 2015		Mar. 15, 2014	Sep. 30, 2014		Feb. 13, 2014	Feb. 21, 2014	Dec. 20, 2015	Mar. 15, 2015
Debt Instrument [Line Items]
Outstanding capital lease obligations	$ 22,000,000			$ 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	12,000,000			13,000,000
Other Capital Lease Arrangements
Debt Instrument [Line Items]
Outstanding capital lease obligations	10,000,000			13,000,000
Five-Year Swap Rate | Financing Arrangements For Capital Leases
Debt Instrument [Line Items]
Basis spread on variable rate	5.64%
30-Day LIBOR | Capital Lease Arrangements
Debt Instrument [Line Items]
Basis spread on variable rate	4.75%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						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						89,000,000
Revolving Credit Facility - Amended - Matures In February 2019 | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						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	622,000,000
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	2.50%
6.25 percent notes due 2024
Debt Instrument [Line Items]
Long-term debt outstanding	225,000,000	[1]		225,000,000	[1]
Interest rate	6.25%			6.25%
6.75 percent notes due 2021
Debt Instrument [Line Items]
Long-term debt outstanding	275,000,000	[1]		275,000,000	[1]
Interest rate	6.75%			6.75%
10.625% Notes Due 2018
Debt Instrument [Line Items]
Redemption price, percentage			105.313%
Unamortized discount				3,000,000
10.625% Notes Due 2018 | Financing Arrangement
Debt Instrument [Line Items]
Interest rate									10.625%
Other Borrowings
Debt Instrument [Line Items]
Long-term debt outstanding	22,000,000			31,000,000
Other Letters of Credit Arrangements
Debt Instrument [Line Items]
Amount of letters of credit outstanding	6,000,000			9,000,000
BRAZIL | Export Financing Arrangement | Financing Arrangement
Debt Instrument [Line Items]
Long-term debt outstanding	22,000,000			29,000,000
Interest rate	5.50%
INDIA | Export Financing Arrangement | Financing Arrangement
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	20,000,000			32,000,000
Debt default, amount	$ 35,000,000

[1] The 6.75 percent and 6.25 percent notes contain a call option, which allows for early redemption