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PROPERTY AND EQUIPMENT, NET (NARRATIVE) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2015
Jun. 27, 2014
Jun. 26, 2015
Jun. 27, 2014
Dec. 26, 2014
Property, Plant and Equipment [Line Items]          
Capitalized computer software, net $ 25.8   $ 25.8   $ 30.2
Depreciation expense $ 5.8 $ 3.7 $ 11.2 $ 7.4