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Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2017 | Mar. 26, 2016 | Dec. 31, 2016 | Dec. 26, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Revenue | $ 445,763 | $ 354,868 |  |
Restricted cash combined with unrestricted cash | 133,827 | 159,321 | $ 119,894 | $ 119,963
Impact to income statement from recognition of excess tax benefits and tax deficiencies | 7,500 |  |  |
Net cash provided by operating activities | 34,029 | 45,844 |  |
Net cash provided by financing activities | (74,324) | (294) |  |
Operating income | 69,472 | 51,472 |  |
Accounting Standards Update 2016-09 |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Net cash provided by operating activities |  | (7,400) |  |
Net cash provided by financing activities |  | (7,400) |  |
Accounting Standards Update 2016-18 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Restricted cash combined with unrestricted cash |  | 1,900 |  | $ 2,000
Operating segments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Operating income | 102,972 | 86,831 |  |
Operating segments | Research Models and Services [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Revenue | 127,161 | 123,339 |  |
Operating income | $ 37,711 | 36,386 |  |
Operating segments | Restatement Adjustment [Member] | Research Models and Services [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Revenue |  | (700) |  |
Operating income |  | $ (100) |  |

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