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Accrued Expenses | 9 Months Ended
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Sep. 26, 2020
Accrued Liabilities, Current [Abstract] |
Accrued Expenses | 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 |
As of September 26, 2020, and December 28, 2019, approximately $71.3 million and $81.2 million, respectively, of accrued bonuses were included above in “Compensation and related expenses.”​

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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