Segment Information and Geographical Data (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2025 USD ($) Segment	Dec. 27, 2024 USD ($)	Sep. 23, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment	3
Number of reportable segments | Segment	3
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chief Executive Officer [Member]
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM primarily uses revenue before reimbursement generated by the segment, cost of sales, gross margin, selling, general and administrative costs and contribution margin as a measure of profitability for each of its segments as these measures provide a comprehensive view of the segments’ financial performance. The measurement criteria for segment profit or loss are substantially the same for each reportable segment, excluding any unusual or infrequent items, if any.
Goodwill	$ 90,221	$ 89,782
Goodwill included in foreign assets	14,400	14,000
Global S&BT [Member]
Segment Reporting Information [Line Items]
Goodwill	63,529	63,090
United Kingdom [Member]
Segment Reporting Information [Line Items]
Goodwill	13,500	$ 13,100
United Kingdom [Member] | Global S&BT [Member]
Segment Reporting Information [Line Items]
Goodwill	5,800
Leewayhertz Technologies Private Limited [Member]
Segment Reporting Information [Line Items]
Goodwill			$ 5,876
Intangible assets	2,500		$ 2,500
Leewayhertz Technologies Private Limited [Member] | United States [Member]
Segment Reporting Information [Line Items]
Goodwill	5,100
Intangible assets	$ 2,200