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Nature of Operations and Basis of Presentation (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2016
USD ($)
item
Mar. 31, 2015
Sep. 30, 2015
USD ($)
Adoption of recently issued accounting standards      
Deferred income taxes $ 83,626   $ 92,852
Nature of operations and basis of presentation      
Number of building materials segments | item 2    
Percentage of total revenue and cost of revenue for services 9.00% 10.00%  
Accounting Standards Update 2015-17 | New Accounting Pronouncement, Early Adoption Effect      
Adoption of recently issued accounting standards      
Current and deferred income taxes     (23,400)
Deferred income taxes     $ 23,400