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Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Accrued Expenses
Compensation and related expenses	$ 68,832	$ 99,993
Income taxes payable	3,321	430
Commissions due to non-employee experts	293	9,961
Other professional fees	2,502	2,077
Direct project accruals	3,320	3,201
Accrued leasehold improvements	895	2,166
Other	3,036	3,473
Total accrued expenses	82,199	121,301
Compensation and related expenses
Accrued bonuses	$ 47,800	$ 81,200

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Carrying value as of the balance sheet date of obligations incurred and payable for leasehold improvements expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for project costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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