Contingencies - Narrative (Details) (USD $)	12 Months Ended		3 Months Ended					12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Specific Warranty Issue	Sep. 30, 2014 Performance Bonds	Sep. 30, 2014 Letter of Credit	Sep. 30, 2013 Letter of Credit	Sep. 30, 2014 DPA Liability	Sep. 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	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum
Loss Contingencies [Line Items]
Standard product warranty period											1 year	2 years
Product Warranty Expense			$ 4,900,000
Company's Liability Under Deferred Prosecution Agreement, Percentage of Company's Adjusted EBITDA	4.00%
Loss Contingency, Range of Possible Loss, Maximum	48,000,000
Loss Contingency, Damages Paid, Value	22,700,000							125,000
Area of Land								35
Accrued amounts for litigation and other contingent liabilities	13,400,000	19,900,000					2,100,000
Loss Contingency, Damages Sought, Value								250,000	630,000	678,000
Letters of credit secured using cash collateral					39,100,000	25,200,000
Cash collateral in restricted accounts securing letters of credit				$ 221,100,000
Standard Product Warranty Description			P7Y