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Nature of Operations and Basis of Presentation (Details)
$ in Thousands
9 Months Ended
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
Sep. 30, 2015
USD ($)
Adoption of recently issued accounting standards      
Deferred income taxes $ 74,824   $ 92,852
Nature of operations and basis of presentation      
Number of building materials segments | segment 2    
Percentage of total revenue and cost of revenue for services 9.00% 9.00%  
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