Contingencies - Litigation and Other Matters (Details) (USD $)	9 Months Ended					9 Months Ended	12 Months Ended
	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Performance Bonds	Jun. 30, 2014 Letter of Credit	Sep. 30, 2013 Letter of Credit	Jun. 30, 2014 First Order New Jersey Department of Environmental Protection - Violation of Permit acre	Sep. 30, 2006 First Order New Jersey Department of Environmental Protection - Violation of Permit	Sep. 30, 2006 Second Order New Jersey Department of Environmental Protection - Violation of Permit
Loss Contingencies [Line Items]
Minimum standard product warranty period	1 year
Maximum standard product warranty period	2 years
Company's liability under Deferred Prosecution Agreement (percent)	4.00%
Maximum liability under the DPA and other settlement agreements	$ 55,000,000
Portion of liability under DPA that has been paid as of balance sheet date	20,200,000					125,000
Additional liability recorded as of end of period	3,300,000
Amount demanded per the complaint to recover purported losses						250,000	630,000	678,000
Area of land						35
Accrued amounts for litigation and other contingent liabilities	18,000,000	19,900,000
Letters of credit secured using cash collateral				33,700,000	25,200,000
Cash collateral in restricted accounts securing letters of credit			$ 200,300,000