Acquisitions - Narrative (Details) $ in Millions						1 Months Ended	12 Months Ended
	May 23, 2022 USD ($)	Mar. 09, 2022 USD ($)	Dec. 30, 2021 USD ($)	Dec. 27, 2021 USD ($)	Dec. 10, 2021 USD ($)	Dec. 30, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 25, 2022 USD ($)	Oct. 03, 2023 USD ($) shares
Business Acquisition [Line Items]
Deferred tax assets, net							$ 64.0	$ 70.3
Goodwill							$ 569.1	558.2
Level 3 | Discount Rate | Income Approach
Business Acquisition [Line Items]
Discount rate	0.064						0.11
Level 3 | Royalty Rate | Income Approach
Business Acquisition [Line Items]
Discount rate							0.11
Level 3 | Royalty Rate | Income Approach | Minimum
Business Acquisition [Line Items]
Discount rate	0.11
Level 3 | Royalty Rate | Income Approach | Maximum
Business Acquisition [Line Items]
Discount rate	0.12
CTT, Inc.
Business Acquisition [Line Items]
Cash paid			$ 15.2		$ 6.3	$ 22.0
Cosmic Advanced Engineering Solutions, Inc.
Business Acquisition [Line Items]
Cash paid				$ 39.4
Payments to acquire business, subject to adjustments				37.9
Payments to acquire businesses, amount not included holdback paid at later				0.4
Net liabilities				6.7
Deferred tax liabilities, net				2.4
Total consideration				37.9
Goodwill				29.2
Accounts receivable				3.8
Cosmic Advanced Engineering Solutions, Inc. | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 4.4
Acquired finite-lived intangible assets, weighted average useful life				10 years
Cosmic Advanced Engineering Solutions, Inc. | Contracts and backlog
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 1.7
Acquired finite-lived intangible assets, weighted average useful life				1 year
Cosmic Advanced Engineering Solutions, Inc. | Trade names
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 0.6
Acquired finite-lived intangible assets, weighted average useful life				5 years
Cosmic Advanced Engineering Solutions, Inc. | Developed technology and technical know-how
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 1.8
Acquired finite-lived intangible assets, weighted average useful life				5 years
Southern Research Engineering Division
Business Acquisition [Line Items]
Cash paid	$ 74.4	$ 74.4
Net liabilities	2.5
Total consideration	79.4	79.4
Common stock issued	5.0	$ 5.0
Deferred tax assets, net	0.2
Business combination, pro forma information, revenue of acquiree since acquisition date, actual							$ 53.2	26.8
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual							$ 3.6	$ 2.9
Goodwill	34.3
Accounts receivable	2.9
Southern Research Engineering Division | Contracts and backlog
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 2.5
Acquired finite-lived intangible assets, weighted average useful life	3 years
Southern Research Engineering Division | In orocess research and development
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 7.3
Southern Research Engineering Division | Trade names
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 0.5
Acquired finite-lived intangible assets, weighted average useful life	5 years
Southern Research Engineering Division | Developed technology and technical know-how
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 0.5
Acquired finite-lived intangible assets, weighted average useful life	3 years
Sierra Technical Services Inc
Business Acquisition [Line Items]
Number of common stock shares acquired (in shares) | shares									866,026
Business acquisition, common stock value acquired									$ 12.8
Number of additional common shares to be acquired (in shares) | shares									979,038
Additional equity interests issuable									$ 14.5
Net assets									12.4
Goodwill									10.9
Accounts receivable									11.0
Finite-lived intangible assets acquired									14.0
Deferred revenue									$ 11.4