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Commitments and Contingencies (Details) CAD in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2015 CAD | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2015 CAD
Loss Contingency, Damages Sought, Value | CAD |  | CAD 10.0 |  |  |
Damages arising due to alleged environmental contamination of the property and breach of lease | CAD |  |  |  |  | CAD 10.0
Walter Energy tax assessment | $ 33.0 |  |  |  |
Amount payable pending completion of an IRS audit | 11.6 |  |  |  |
Provision for Doubtful Accounts | 0.1 |  | $ 0.0 | $ 0.4 |
Operating Leases |  |  |  |  |
Rent expense | 10.4 |  | 9.3 | 8.4 |
Future minimum payment under non-cancelable operating leases, CY Plus 1 | 6.7 |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 2 | 5.5 |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 3 | 3.0 |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 4 | 1.7 |  |  |  |
Future minimum payment under non-cancelable operating leases, CY Plus 5 | 0.6 |  |  |  |
Future minimum payment under non-cancelable operating leases, CY plus 6 and up | 1.9 |  |  |  |
WalterEnergy [Member] |  |  |  |  |
Provision for Doubtful Accounts | $ 11.6 |  | $ 0.0 | $ 0.0 |

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