| Standard label: | Defined Benefit Plan, Plan Assets, Contributions by Plan Participant |
| Name: | us-gaap:DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant |
| Documentation: | Amount of contributions received by defined benefit plan from participant which increases plan assets. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant |
| Label | Role | Language |
| Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (b)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| Part Of Roll Up: |
| us-gaap:DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease |