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Contingencies - Narrative (Details) (USD $) | 12 Months Ended |  | 3 Months Ended |  |  |  | 12 Months Ended
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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 |  |  |  |  |  |  |  |  |

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- Definition The fair value, as of the date of each statement of financial position presented, of securities that are restricted as collateral under letter of credit agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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- Definition The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3,4)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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