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Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 25, 2022 | Dec. 26, 2021
Cosmic Advanced Engineering Solutions, Inc. |  |
Business Acquisition [Line Items] |  |
Pro forma revenues |  | $ 855.2
Pro forma net income (loss) before tax |  | (0.8)
Pro forma net income ( loss) |  | $ (2.9)
Basic pro format income (loss) per share (in dollars per share) |  | $ (0.03)
Diluted pro forma income (loss) per share (in dollars per share) |  | $ (0.03)
Southern Research Engineering Division |  |
Business Acquisition [Line Items] |  |
Pro forma revenues | $ 915.3 | $ 850.7
Pro forma net income (loss) before tax | (31.6) | 3.8
Pro forma net income ( loss) | $ (35.8) | $ 1.3
Basic pro format income (loss) per share (in dollars per share) | $ (0.28) | $ 0.01
Diluted pro forma income (loss) per share (in dollars per share) | $ (0.28) | $ 0.01

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