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Restructuring Changes in restructuring liability (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,421
Restructuring expense	780	0	1,400
Payments for Restructuring	(576)
Restructuring Reserve	1,625		1,625
Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	214
Restructuring expense	759
Payments for Restructuring	(487)
Restructuring Reserve	486		486
Remediation Property for Sale, Abandonment or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,207
Restructuring expense	21
Payments for Restructuring	(89)
Restructuring Reserve	$ 1,139		$ 1,139

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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