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Schedule of Potentially Dilutive Stock Options and Restricted Stock Excluded from Calculation of Diluted Loss per Share (Detail) - shares
shares in Millions
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Stock options and restricted stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities 8 7
Redeemable preferred stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities   56