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SEGMENT INFORMATION SEGMENT GEOGRAPHICAL (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Jan. 01, 2017
Sep. 23, 2016
Jun. 24, 2016
Mar. 25, 2016
Dec. 31, 2017
Jan. 01, 2017
Dec. 25, 2015
Segment Reporting Information [Line Items]                      
Revenue from services $ 669,625 $ 660,780 $ 610,122 $ 568,244 $ 734,951 $ 697,097 $ 672,612 $ 645,980 $ 2,508,771 $ 2,750,640 $ 2,695,680
Revenue from sales, percent                 100.00% 100.00% 100.00%
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Revenue from services                 $ 2,387,992 $ 2,644,414 $ 2,603,085
Revenue from sales, percent                 95.20% 96.10% 96.60%
International operations                      
Segment Reporting Information [Line Items]                      
Revenue from services                 $ 120,779 $ 106,226 $ 92,595
Revenue from sales, percent                 4.80% 3.90% 3.40%