Property, Plant and Equipment, Net - Components of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 28, 2015
Dec. 27, 2014
Dec. 28, 2013
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   $ 1,229,976 $ 1,044,160
Less accumulated depreciation, depletion and amortization $ (297,187) (279,375) (212,382)
Property, plant and equipment, net $ 948,129 950,601 831,778
Land (Mineral Bearing) and Asset Retirement Costs [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   129,957 107,007
Land (Non-Mineral Bearing) [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   112,932 81,331
Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   86,702 77,535
Plants, Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   622,466 553,113
Mobile Equipment and Barges [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   182,334 117,828
Office Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   14,087 10,001
Truck and Auto Fleet [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   22,821 19,165
Landfill Airspace and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   48,513 46,841
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   8,445 29,560
Other [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   $ 1,719 $ 1,779