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Short-term Borrowings and Long-Term Debt - Details of Long-Term Debt Table (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2012
Debt Instruments          
Total $ 1,800,000   $ 1,800,000    
ABL facility | Prime | Minimum          
Debt Instruments          
Percentage points added to the reference rate 0.50%        
ABL facility | Prime | Maximum          
Debt Instruments          
Percentage points added to the reference rate 0.75%        
ABL facility | LIBOR | Minimum          
Debt Instruments          
Percentage points added to the reference rate 1.50%        
ABL facility | LIBOR | Maximum          
Debt Instruments          
Percentage points added to the reference rate 1.75%        
Senior notes due Nov. 2019          
Debt Instruments          
Total     750,000    
Interest rate (as a percent) 6.875%       6.875%
Senior notes due Jun. 2022          
Debt Instruments          
Total $ 850,000   850,000    
Interest rate (as a percent) 5.75%       5.75%
Senior notes due Nov. 2023          
Debt Instruments          
Total $ 200,000   $ 200,000    
Interest rate (as a percent) 5.50%     5.50%  
Senior notes due Dec. 2025          
Debt Instruments          
Total $ 750,000        
Interest rate (as a percent) 5.625% 5.625%