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Segment Reporting (Details) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 28, 2025 USD ($)	Mar. 29, 2025 USD ($)	Jun. 29, 2024 USD ($)	Mar. 30, 2024 USD ($)	Jun. 28, 2025 USD ($) segment	Jun. 29, 2024 USD ($)	Dec. 28, 2024 USD ($)
Segment Reporting [Abstract]
Number of business segment | segment					1
Segment Reporting Information [Line Items]
Consulting services revenues	$ 186,878		$ 171,442		$ 368,729	$ 343,230
Forgivable loan amortization					14,080		$ 31,055
Provision for income taxes	4,994		3,076		11,636	8,397
Net income	12,122	$ 18,002	6,538	$ 13,691	30,124	20,229
Operating Segments
Segment Reporting Information [Line Items]
Consulting services revenues	186,878		171,442		368,729	343,230
Employee compensation and fringe benefit costs	110,860		106,270		223,657	211,417
Forgivable loan amortization	7,428		11,985		14,080	17,757
Client reimbursable expenses	19,615		16,361		36,121	33,423
Other segment expense	31,859		27,212		53,111	52,007
Provision for income taxes	4,994		3,076		11,636	8,397
Net income	12,122		6,538		30,124	20,229
Adjustments and reconciling items
Segment Reporting Information [Line Items]
Net income	$ 0		$ 0		$ 0	$ 0

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