Defined Contribution Plan, Requisite Service Period

No definition available.

Name:	cmpo_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix:	cmpo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
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

+ Details

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

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	cmpo_DefinedContributionPlanMatchingScenarioAxis=cmpo_DefinedContributionPlanMatchingScenarioOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cmpo_DefinedContributionPlanMatchingScenarioAxis=cmpo_DefinedContributionPlanMatchingScenarioTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

RETIREMENT PLAN - Defined Contribution Plan (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Defined Contribution Plan Disclosure [Line Items]
Required period of service to participate in plan				90 days
Retirement plan expense		$ 0	$ 431	$ 563	$ 1,483
Matching scenario one
Defined Contribution Plan Disclosure [Line Items]
Employer match	100.00%					100.00%
Employee contributions	3.00%					1.00%
Matching scenario two
Defined Contribution Plan Disclosure [Line Items]
Employer match	50.00%					50.00%
Employee contributions	2.00%					5.00%