Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Consolidated Statements Of Operations [Abstract]
Net Sales	$ 847,976	$ 908,033	$ 522,563
Business Interruption Insurance Recovery		84,677
Cost of Sales (includes depreciation of $21,034,000, $21,776,000 and $12,356,000 for the years ended September 30, 2011, 2010 and 2009, respectively)	(861,507)	(927,302)	(511,510)
Selling, General and Administrative Expense (includes depreciation of $823,000, $1,261,000 and $1,923,000 for the years ended September 30, 2011, 2010 and 2009, respectively)	(38,013)	(41,434)	(45,760)
Refinery Explosion Related Charges, Net	(2,222)	(8,600)	(53,793)
Insurance Recoveries Recognized		193,796	30,404
Gain on Contribution of Assets to Joint Venture	3,598
Gain on Litigation Settlement			16,148
Operating Income (Loss)	(50,168)	209,170	(41,948)
Interest Expense	(2,307)	(1,721)	(1,474)
Interest Income	404	52	489
Other Income (Loss), Net	(6,818)	5,542	3,048
Income (Loss) from Continuing Operations Before Income Taxes	(58,889)	213,043	(39,885)
Benefit (Provision) for Income Taxes (includes a valuation allowance of $17,321,000 for the year ended September 30, 2011)	5,496	(76,183)	16,058
Income (Loss) from Continuing Operations	(53,393)	136,860	(23,827)
Income (Loss) from Discontinued Operations			644
Net Income (Loss)	$ (53,393)	$ 136,860	$ (23,183)
Basic Earnings (Loss) per Share of Common Stock:
Income (Loss) from Continuing Operations	$ (4.49)	$ 11.59	$ (2.03)
Income (Loss) from Discontinued Operations			$ 0.05
Net Income (Loss)	$ (4.49)	$ 11.59	$ (1.98)
Diluted Earnings (Loss) per Share of Common Stock:
Income (Loss) from Continuing Operations	$ (4.49)	$ 11.33	$ (2.03)
Income (Loss) from Discontinued Operations			$ 0.05
Net Income (Loss)	$ (4.49)	$ 11.33	$ (1.98)
Weighted Average Shares Outstanding:
Basic	11,899,820	11,805,587	11,721,357
Diluted	11,899,820	12,082,000	11,721,357