Basis of Presentation and General Information (Narrative) (Details)			3 Months Ended		6 Months Ended
	May 15, 2025 USD ($)	Sep. 23, 2024 USD ($)	Jun. 27, 2025 USD ($)	Jun. 28, 2024 USD ($)	Jun. 27, 2025 USD ($) Segment	Jun. 28, 2024 USD ($)	Dec. 27, 2024 USD ($)	Dec. 29, 2023 USD ($)
Basis Of Presentation And General Information [Line Items]
Cash consideration paid for acquisition					$ (767,000)
Goodwill			$ 91,135,000		91,135,000		$ 89,782,000
Amortization expense			231,000		$ 376,000
Number of operating segments | Segment					3
Number of reportable segments | Segment					3
Number of reporting units | Segment					3
Revenue recognized as a result of change in contract liability			1,900,000	$ 3,300,000	$ 6,200,000	$ 9,000,000
Contract liabilities			13,773,000		13,773,000		11,118,000	$ 12,100,000
Deferred commissions							$ 1,800,000	$ 1,700,000
Commissions expense			400,000	400,000	400,000	600,000
Impairment loss recognized to capitalization of deferred commissions					0
Segment revenue			78,899,000	$ 77,656,000	$ 156,764,000	$ 154,843,000
Minimum [Member]
Basis Of Presentation And General Information [Line Items]
Business relationship agreement period					6 months
Maximum [Member]
Basis Of Presentation And General Information [Line Items]
Business relationship agreement period					12 months
Customer contract period					12 months
Development Cost					$ 10,000,000
Leewayhertz Technologies Private Limited [Member]
Basis Of Presentation And General Information [Line Items]
Percentage of equity acquired		100.00%
Purchase consideration		$ 7,832,000
Goodwill		5,876,000
Intangible assets		$ 2,500,000	$ 2,500,000		$ 2,500,000
Intangible assets, remaining weighted average useful life		3 years 10 months 24 days
Spend Matters LLC [Member]
Basis Of Presentation And General Information [Line Items]
Cash consideration paid for acquisition	$ (766,000)
Intangible assets	$ 2,000,000
Intangible assets, remaining weighted average useful life	3 years