Amount of net asset available for benefit transferred to (from) employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from (to) external plan.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 962
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Name:	us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Summary of Significant Accounting Policies (Details) - Mayville Engineering Company, Inc. 401(k) Plan - USD ($) $ in Thousands			12 Months Ended
	Jan. 16, 2026	Jul. 01, 2025	Dec. 31, 2025
Summary of Significant Accounting Policies
Acquisition percentage		100.00%
Plan transfers			$ 10,696
Subsequent Event
Summary of Significant Accounting Policies
Plan transfers	$ 4,951