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Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Business Acquisition [Line Items]      
Acquired intangible assets weighted average life 18 years    
Aggregate reserves $ 5.9ck0001571371_ReservesRelatedToIntangibleAssetsAcquired    
Reserve Rights [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets weighted average life   20 years  
Leases [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets weighted average life     11 years