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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 23, 2016
Sep. 25, 2015
Sep. 23, 2016
Sep. 25, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Total stock-based compensation expense $ 1.4 $ 2.5 $ 7.4 $ 8.3