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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 25, 2015
Dec. 27, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Total stock-based compensation expense $ 11.1 $ 8.4
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 3.9 $ 2.9