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Segment Reporting (Details) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 27, 2025 USD ($)	Jun. 28, 2025 USD ($)	Mar. 29, 2025 USD ($)	Sep. 28, 2024 USD ($)	Jun. 29, 2024 USD ($)	Mar. 30, 2024 USD ($)	Sep. 27, 2025 USD ($) segment	Sep. 28, 2024 USD ($)
Segment Reporting [Abstract]
Number of business segment | segment							1
Segment Reporting Information [Line Items]
Consulting services revenues	$ 185,891			$ 167,748			$ 554,620	$ 510,979
Forgivable loan amortization			$ 31,055				22,605
Provision for income taxes	4,751			4,593			16,387	12,991
Net income	11,473	$ 12,122	$ 18,002	11,437	$ 6,538	$ 13,691	41,597	31,666
Operating Segments
Segment Reporting Information [Line Items]
Consulting services revenues	185,891			167,748			554,620	510,979
Employee compensation and fringe benefit costs	115,390			101,991			339,047	313,408
Forgivable loan amortization	8,525			6,384			22,605	24,141
Client reimbursable expenses	17,802			16,107			53,923	49,530
Other segment expense	27,950			27,236			81,061	79,243
Provision for income taxes	4,751			4,593			16,387	12,991
Net income	11,473			11,437			41,597	31,666
Adjustments and reconciling items
Segment Reporting Information [Line Items]
Net income	$ 0			$ 0			$ 0	$ 0

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