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SEGMENT AND GEOGRAPHIC INFORMATION Financial Information by Reportable Business Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 466,789 | $ 425,720 | $ 434,055 | $ 354,868 | $ 353,850 | $ 349,465 | $ 339,573 | $ 320,414 | $ 1,681,432 | $ 1,363,302 | $ 1,297,662
Operating income | $ 69,091 | $ 58,795 | $ 58,061 | $ 51,472 | $ 52,269 | $ 55,440 | $ 55,735 | $ 43,005 | 237,419 | 206,449 | 177,670
Depreciation and amortization |  |  |  |  |  |  |  |  | 126,658 | 94,881 | 96,445
Capital expenditures |  |  |  |  |  |  |  |  | 55,288 | 63,252 | 56,925
RMS |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 494,037 | 470,411 | 503,656
Operating income |  |  |  |  |  |  |  |  | 136,365 | 120,973 | 120,736
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,853 | 22,526 | 27,309
Capital expenditures |  |  |  |  |  |  |  |  | 11,642 | 17,398 | 18,669
DSA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 836,593 | 612,173 | 538,218
Operating income |  |  |  |  |  |  |  |  | 138,157 | 121,981 | 69,749
Depreciation and amortization |  |  |  |  |  |  |  |  | 71,816 | 46,812 | 47,138
Capital expenditures |  |  |  |  |  |  |  |  | 27,493 | 30,333 | 19,759
Manufacturing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 350,802 | 280,718 | 255,788
Operating income |  |  |  |  |  |  |  |  | 104,543 | 74,675 | 79,260
Depreciation and amortization |  |  |  |  |  |  |  |  | 25,566 | 18,129 | 14,295
Capital expenditures |  |  |  |  |  |  |  |  | $ 12,247 | $ 9,814 | $ 15,621

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