Acquisitions - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 27, 2014
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Mar. 28, 2015
Jan. 17, 2014
Business Acquisition [Line Items]            
Proforma effect on revenue   $ 1,326,861,000 $ 1,230,491,000 $ 1,022,535,000    
Net income from the acquisition   8,181,000 (104,705,000) (46,405,000)    
Senior Notes [Member]            
Business Acquisition [Line Items]            
Debt instrument, face amount   $ 625,000,000 250,000,000   $ 625,000,000  
West Region [Member] | Senior Notes [Member]            
Business Acquisition [Line Items]            
Debt instrument, face amount           $ 260,000,000
Interest rate           10.50%
2014 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Mar. 31, 2014        
2014 Acquisitions [Member] | Central Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Oct. 03, 2014        
2014 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Jan. 17, 2014        
2014 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Sep. 30, 2014        
2014 Acquisitions [Member] | East Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Jun. 09, 2014        
2014 Acquisitions [Member]            
Business Acquisition [Line Items]            
Proforma effect on revenue     305,700,000 82,400,000    
Net income from the acquisition     33,700,000 4,700,000    
2014 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Sep. 19, 2014        
2014 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Sep. 04, 2014        
2014 Acquisitions [Member] | West Region [Member] | Senior Notes [Member]            
Business Acquisition [Line Items]            
Debt instrument, face amount   $ 115,000,000        
Interest rate   10.50%        
2014 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Jul. 29, 2014        
2013 Acquisitions [Member]            
Business Acquisition [Line Items]            
Proforma effect on revenue     8,600,000 13,800,000    
Net income from the acquisition     $ (3,400,000) $ (500,000)    
2013 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date Apr. 01, 2013          
2013 Acquisitions [Member] | Central Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Apr. 01, 2013        
2012 Acquisitions [Member]            
Business Acquisition [Line Items]            
Proforma effect on revenue   $ 197,500,000        
Net income from the acquisition   35,600,000        
2012 Acquisitions [Member] | Alleyton, Southwest Ready Mix [Member]            
Business Acquisition [Line Items]            
Proforma effect on revenue   150,900,000        
2012 Acquisitions [Member] | Colorado County S&G [Member]            
Business Acquisition [Line Items]            
Net income from the acquisition   $ 32,600,000        
2012 Acquisitions [Member] | West Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Nov. 30, 2012        
2012 Acquisitions [Member] | East Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Oct. 05, 2012        
2012 Acquisitions [Member] | Central Region [Member]            
Business Acquisition [Line Items]            
Business acquisition date   Feb. 29, 2012