| Standard label: | Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |
| Name: | us-gaap:DefinedBenefitPlanActuarialGainLoss |
| Documentation: | Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanActuarialGainLoss |
| Label | Role | Language |
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (a)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| Part Of Roll Up: |
| us-gaap:DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease |