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Reportable Segments - Financial Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Apr. 02, 2017 USD ($) | Jan. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Oct. 01, 2017 USD ($) | Oct. 02, 2016 USD ($)
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |
Number of renamed reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Revenue | $ 739,343 | $ 764,795 | $ 700,262 | $ 759,749 | $ 735,188 | $ 685,539 | $ 663,781 | $ 668,851 | $ 2,964,148 | $ 2,753,360 | $ 2,583,469
Income from operations | 43,285 | $ 55,496 | $ 42,716 | $ 48,589 | 54,647 | $ 45,884 | $ 42,956 | $ 39,855 | 190,086 | 183,342 | 135,855
Amortization expense for intangible assets |  |  |  |  |  |  |  |  | 18,200 | 22,800 | 22,100
Fair value adjustments to contingent consideration liabilities |  |  |  |  |  |  |  |  | (4,252) | 6,923 | (2,823)
Acquisition and integration expenses |  |  |  |  |  |  |  |  | 0 | 0 | 19,548
Total Assets | 1,959,421 |  |  |  | 1,902,745 |  |  |  | 1,959,421 | 1,902,745 |
Operating segments | GSG |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,694,871 | 1,487,611 | 1,289,506
Income from operations |  |  |  |  |  |  |  |  | 168,211 | 138,199 | 101,595
Total Assets | 468,010 |  |  |  | 378,839 |  |  |  | 468,010 | 378,839 |
Operating segments | CIG |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,323,142 | 1,326,020 | 1,297,209
Income from operations |  |  |  |  |  |  |  |  | 74,451 | 90,817 | 106,602
Total Assets | 478,197 |  |  |  | 518,697 |  |  |  | 478,197 | 518,697 |
Operating segments | RCM |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 14,199 | 18,207 | 52,150
Income from operations |  |  |  |  |  |  |  |  | (4,573) | (14,712) | (11,834)
Total Assets | 25,683 |  |  |  | 33,620 |  |  |  | 25,683 | 33,620 |
Elimination of inter-segment revenue |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (68,064) | (78,478) | (55,396)
Corporate |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | (48,003) | (30,962) | $ (60,508)
Total Assets | $ 987,531 |  |  |  | $ 971,589 |  |  |  | $ 987,531 | $ 971,589 |

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- Definition This element represents acquisition and integration -related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
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