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Commitments and Contingencies (Details) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 USD ($) | Sep. 30, 2014 CAD | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2014 Prior To 1995 [member] USD ($) | Sep. 30, 2014 From 2000 to 2005 [Member] USD ($)
Loss Contingency, Damages Sought, Value |  | 10.0 |  |  |  |
Damages arising due to alleged environmental contamination of the property and breach of lease |  | 10 |  |  |  |
Walter Energy tax assessment |  |  |  |  | 34.0 | 82.2
Walter Energy tax assessment prior to 1995 related to timing | 21.0 |  |  |  |  |
Amount payable pending completion of an IRS audit | 11.6 |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation | 0.9 |  |  |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges | 2.5 |  |  |  |  |
Operating Leases |  |  |  |  |  |
Rent expense | 9.3 |  | 8.4 | 8.4 |  |
Future minimum payment under non-cancelable operating leases, CY Plus 1 | 7.1 |  |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 2 | 5.8 |  |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 3 | 4.5 |  |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 4 | 2.8 |  |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 5 | 2.0 |  |  |  |  |
Future minimum payment under non-cancelable operating leases, CY plus 6 and up | $ 2.5 |  |  |  |  |

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