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v3.20.2

Accrued Expenses (Tables) | 9 Months Ended
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Sep. 26, 2020
Accrued Liabilities, Current [Abstract] |
Schedule of accrued expenses | Accrued expenses consist of the following (in thousands):
​ | September 26, 2020 |  | December 28, 2019
Compensation and related expenses | $ | 92,200 |  |  | $ | 99,993 |
Income taxes payable | 488 |  |  | 430 |
Commissions due to non-employee experts | 1,808 |  |  | 9,961 |
Other professional fees | 2,116 |  |  | 2,077 |
Direct project accruals | 3,622 |  |  | 3,201 |
Accrued leasehold improvements | 441 |  |  | 2,166 |
Other | 3,277 |  |  | 3,473 |
Total accrued expenses | $ | 103,952 |  |  | $ | 121,301 |

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