Guarantor Subsidiaries (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2010
ASSETS
Cash and Cash Equivalents	$ 39,197	$ 30,703	$ 23,773	$ 23,985
Accounts Receivable, Net	21,266	46,356
Inventories	39,653	39,154
Prepaid Expenses and Other Assets	1,571	4,141
Income Taxes Receivable and Deferred Income Taxes	7,102	7,693
Assets of Discontinued Operations	31,597
Total Current Assets	140,386	128,047
Property, Plant and Equipment, Net	102,683	112,232
Intangible Assets, Net		585
Goodwill		2,930
Deferred Income Taxes	9,996	14,788
Other Assets	9,083	10,068
Assets of Discontinued Operations	7,503
TOTAL ASSETS	269,651	268,650
Liabilities and Stockholders' Equity:
Accounts Payable and Other Current Liabilities	26,829	29,425
Current Portion of Environmental Remediation Reserves	8,328	11,999
Deferred Revenues and Customer Deposits	12,454	12,730
Less Current Portion	17	69
Liabilities of Discontinued Operations	7,142
Total Current Liabilities	54,770	54,223
Long-Term Debt	105,007	105,034
Environmental Remediation Reserves	11,925	14,174
Pension Obligations and Other Long-Term Liabilities	42,105	45,512
Liabilities of Discontinued Operations Held for Sale	9
Total Liabilities	213,816	218,943
Total Stockholders' Equity	55,835	49,707
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	269,651	268,650
Parent [Member]
ASSETS
Intercompany Advances	73,993	73,940
Investment in Subsidiaries, Net	86,842	80,767
TOTAL ASSETS	160,835	154,707
Liabilities and Stockholders' Equity:
Long-Term Debt	105,000	105,000
Total Liabilities	105,000	105,000
Total Stockholders' Equity	55,835	49,707
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	160,835	154,707
Guarantor Subsidiaries [Member]
ASSETS
Cash and Cash Equivalents	38,618	30,126	23,334	22,991
Accounts Receivable, Net	21,266	41,661
Inventories	39,653	37,992
Prepaid Expenses and Other Assets	1,437	3,739
Income Taxes Receivable and Deferred Income Taxes	7,102	7,693
Assets of Discontinued Operations	24,468
Total Current Assets	132,544	121,211
Property, Plant and Equipment, Net	102,683	110,164
Deferred Income Taxes	9,996	14,724
Other Assets	8,855	9,432
Intercompany Advances		5,179
Investment in Subsidiaries, Net		4,861
Assets of Discontinued Operations	20,964
TOTAL ASSETS	275,042	265,571
Liabilities and Stockholders' Equity:
Accounts Payable and Other Current Liabilities	26,829	27,918
Current Portion of Environmental Remediation Reserves	8,328	11,999
Deferred Revenues and Customer Deposits	12,454	11,204
Less Current Portion	17	23
Intercompany Advances	73,993	73,940
Liabilities of Discontinued Operations	4,161
Total Current Liabilities	125,782	125,084
Long-Term Debt	7	34
Environmental Remediation Reserves	11,925	14,174
Pension Obligations and Other Long-Term Liabilities	42,105	45,512
Liabilities of Discontinued Operations Held for Sale	9
Total Liabilities	179,828	184,804
Total Stockholders' Equity	95,214	80,767
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	275,042	265,571
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and Cash Equivalents	579	577	439	994
Accounts Receivable, Net		5,247
Inventories		1,162
Prepaid Expenses and Other Assets	134	402
Assets of Discontinued Operations	7,308
Total Current Assets	8,021	7,388
Property, Plant and Equipment, Net		2,068
Intangible Assets, Net		585
Goodwill		2,930
Deferred Income Taxes		64
Other Assets	228	636
Assets of Discontinued Operations	5,280
TOTAL ASSETS	13,529	13,671
Liabilities and Stockholders' Equity:
Accounts Payable and Other Current Liabilities		2,059
Deferred Revenues and Customer Deposits		1,526
Less Current Portion		46
Intercompany Advances		5,179
Liabilities of Discontinued Operations	3,160
Total Current Liabilities	3,160	8,810
Liabilities of Discontinued Operations Held for Sale	6,368
Total Liabilities	9,528	8,810
Total Stockholders' Equity	4,001	4,861
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	13,529	13,671
Eliminations [Member]
ASSETS
Cash and Cash Equivalents
Accounts Receivable, Net		(552)
Assets of Discontinued Operations	(179)
Total Current Assets	(179)	(552)
Intercompany Advances	(73,993)	(79,119)
Investment in Subsidiaries, Net	(86,842)	(85,628)
Assets of Discontinued Operations	(18,741)
TOTAL ASSETS	(179,755)	(165,299)
Liabilities and Stockholders' Equity:
Accounts Payable and Other Current Liabilities		(552)
Intercompany Advances	(73,993)	(79,119)
Liabilities of Discontinued Operations	(179)
Total Current Liabilities	(74,172)	(79,671)
Liabilities of Discontinued Operations Held for Sale	(6,368)
Total Liabilities	(80,540)	(79,671)
Total Stockholders' Equity	(99,215)	(85,628)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (179,755)	$ (165,299)