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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