Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093879-108312

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=68049868&loc=SL66093883-108312

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4542-108314

+ Details

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

+ Details

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringReserveAccrualAdjustment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_RestructuringReserveSettledWithoutCash2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment.

+ References

No definition available.

+ Details

Name:	us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dco_ElectronicSystemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_ContractTerminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=dco_ProfessionalServiceFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=dco_AcceleratedDepreciationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dco_StructuralSystemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringPlanAxis=dco_RestructuringPlan2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=dco_StockbasedCompensationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=dco_InventoryReserveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_RestructuringChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Restructuring Activities (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended			14 Months Ended
Restructuring Activities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Charges	$ 3,800	$ 3,400	$ 5,400	$ 2,200	$ 8,800	$ 14,671	$ 8,360	$ 182
Electronic Systems
Restructuring Cost and Reserve [Line Items]
Inventory Write-down						100
Accrued severance and loss on early exit	2,800					2,800			$ 2,800
Restructuring Reserve [Roll Forward]
Charges						2,600
Electronic Systems \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges						3,800
Electronic Systems \| Lease termination
Restructuring Reserve [Roll Forward]
Charges						900
Electronic Systems \| Other
Restructuring Reserve [Roll Forward]
Charges						900
Electronic Systems \| Professional service fees
Restructuring Reserve [Roll Forward]
Charges						200
Electronic Systems \| Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Non-Cash Payments						(100)
Structural Systems
Restructuring Cost and Reserve [Line Items]
Inventory Write-down						500
Accrued severance and loss on early exit	900					900			900
Restructuring Reserve [Roll Forward]
Charges						1,300
Non-Cash Payments						(6,200)
Structural Systems \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges						3,000
Structural Systems \| Other
Restructuring Reserve [Roll Forward]
Charges						400
Structural Systems \| Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Non-Cash Payments						(9,800)
Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance				2,725		2,725
Charges						14,792	8,800		23,600
Cash Payments						(6,433)
Non-Cash Payments						(6,312)
Change in Estimates						(771)
Ending balance	4,001				2,725	4,001	2,725		4,001
Restructuring Plan, 2017 \| Severance and benefits
Restructuring Reserve [Roll Forward]
Beginning balance				2,659		2,659
Charges						5,018
Cash Payments						(4,346)
Non-Cash Payments						0
Change in Estimates						(700)
Ending balance	2,631				2,659	2,631	2,659		2,631
Restructuring Plan, 2017 \| Lease termination
Restructuring Reserve [Roll Forward]
Beginning balance				66		66
Charges						864
Cash Payments						(69)
Non-Cash Payments						0
Change in Estimates						0
Ending balance	861				66	861	66		861
Restructuring Plan, 2017 \| Other
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						1,312
Cash Payments						(896)
Non-Cash Payments						0
Change in Estimates						0
Ending balance	416				0	416	0		416
Restructuring Plan, 2017 \| Professional service fees
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						1,165
Cash Payments						(1,122)
Non-Cash Payments						0
Change in Estimates						0
Ending balance	43				0	43	0		43
Restructuring Plan, 2017 \| Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						6,207
Cash Payments						0
Non-Cash Payments						(6,207)
Change in Estimates						0
Ending balance	0				0	0	0		0
Restructuring Plan, 2017 \| Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						105
Cash Payments						0
Non-Cash Payments						(105)
Change in Estimates						0
Ending balance	0				0	0	0		0
Restructuring Plan, 2017 \| Inventory reserve
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						121
Cash Payments						0
Non-Cash Payments						0
Change in Estimates						(71)
Ending balance	50				0	50	0		50
Restructuring Charges \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance				2,725		2,725
Charges						14,671
Cash Payments						(6,433)
Non-Cash Payments						(6,312)
Change in Estimates						(700)
Ending balance	3,951				2,725	3,951	2,725		3,951
Cost of Sales \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance				$ 0		0
Charges						121
Cash Payments						0
Non-Cash Payments						0
Change in Estimates						(71)
Ending balance	50				$ 0	50	$ 0		50
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit	$ 300					300			$ 300
Restructuring Reserve [Roll Forward]
Charges						1,000
Non-Cash Payments						(100)
Corporate Segment \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges						1,400
Corporate Segment \| Professional service fees
Restructuring Reserve [Roll Forward]
Charges						1,000
Corporate Segment \| Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Non-Cash Payments						$ (1,400)