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SEGMENT INFORMATION SEGMENT GEOGRAPHICAL (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2017
Sep. 23, 2016
Jun. 24, 2016
Mar. 25, 2016
Dec. 25, 2015
Sep. 25, 2015
Jun. 26, 2015
Mar. 27, 2015
Jan. 01, 2017
Dec. 25, 2015
Dec. 26, 2014
Segment Reporting Information [Line Items]                      
Revenue from services $ 734,951 $ 697,097 $ 672,612 $ 645,980 $ 810,733 $ 683,918 $ 627,714 $ 573,315 $ 2,750,640 $ 2,695,680 $ 2,174,045
Sales Revenue, Services, Percent of Revenue                 100.00% 100.00% 100.00%
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Revenue from services                 $ 2,644,414 $ 2,603,085 $ 2,096,958
Sales Revenue, Services, Percent of Revenue                 96.10% 96.60% 96.50%
Outside of United States [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from services                 $ 106,226 $ 92,595 $ 77,087
Sales Revenue, Services, Percent of Revenue                 3.90% 3.40% 3.50%