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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