Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 29, 2024	Dec. 31, 2023	May 23, 2022
Business Acquisition [Line Items]
Goodwill	$ 568.9	$ 569.1
Southern Research Engineering Division
Business Acquisition [Line Items]
Accounts receivable			$ 2.9
Unbilled receivables			11.1
Inventory			0.5
Other current assets			0.2
Property and equipment			22.8
Other assets			0.2
Intangible assets			10.8
Total identifiable net assets acquired			48.5
Total identifiable net liabilities assumed			(3.4)
Goodwill			34.3
Net assets acquired, excluding cash			$ 79.4