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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2022 | Oct. 01, 2023 | Sep. 25, 2022 | Oct. 01, 2023 | Sep. 25, 2022 | Dec. 25, 2022
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Contract assets, net change |  |  |  | $ 0.9 |  |
Contract liabilities, net change |  |  |  | 17.3 |  |
Revenue recognized |  | $ 9.5 | $ 6.6 | 43.1 | $ 42.6 |
Contract assets |  | 223.7 |  | 223.7 |  | $ 222.8
Litigation settlement charges |  |  |  | 0.0 | 5.5 |
Unmanned Systems |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Litigation settlement charges |  |  |  |  | $ 5.5 | $ 5.5
T for C | Unbilled Revenues |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Contract assets |  | $ 4.8 |  | 4.8 |  |
Amount agreed to settlement | $ 6.0 |  |  |  |  |
Negotiation and settlement with the customer |  |  |  | $ 4.8 |  |

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