v3.25.3

Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Oct. 09, 2025 USD ($)	Oct. 03, 2025 USD ($)	Jun. 03, 2025 USD ($)	Jul. 15, 2024 $ / shares	Apr. 30, 2024 $ / shares	Sep. 27, 2025 USD ($)	Jun. 28, 2025 USD ($)	Sep. 27, 2025 USD ($) segment	Sep. 28, 2024 USD ($)	Dec. 31, 2024 USD ($)	Nov. 30, 2024 shares	Nov. 30, 2021 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments \| segment								2
Number of operating segments \| segment								2
litigation settlement costs						$ 151,400
Insurance receivable						56,000		$ 56,000
Assets held for sale as part of other current assets								1,979	$ 0
Gain on sale of property and other assets								1,746	$ 0
Shares acquired (in dollars per share) \| $ / shares				$ 65.00	$ 60.00
Provision for loss on contracts						4,900		4,900		$ 4,700
Production cost of contracts						5,685		5,685		$ 6,802
Contract liability revenue								20,000
Remaining performance obligation						$ 1,031,200		$ 1,031,200
Subsequent event
Significant Accounting Policies [Line Items]
Payment for legal settlement	$ 1,400	$ 150,000
Expected fund for insurance		$ 56,000
Interest rate swap
Significant Accounting Policies [Line Items]
Notional amount												$ 150,000
Albion
Significant Accounting Policies [Line Items]
Number of shares owned by investor (in shares) \| shares											737,992
Berryville \| Held-for-sale
Significant Accounting Policies [Line Items]
Assets held for sale as part of other current assets			$ 2,000
Land, building and building improvements held for sale							$ 800
Gain on sale of property and other assets							$ 1,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-09-28
Significant Accounting Policies [Line Items]
Remaining performance obligation, percentage						70.00%		70.00%
Remaining performance obligation, period						12 months		12 months

Investment, Number Of Shares Owned By Investor

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Litigation Settlement, Funded By Insurance, Amount

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Costs incurred for certain long-term contracts that require machinery or tools to build the parts as specified within the contract. These costs include production and tooling costs. The production contract costs are recorded to costs of sales using the units of delivery method.

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Significant Accounting Policies [Line Items]

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Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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DUCOMMUN INC /DE/ 10-Q