| Standard label: | Defined Benefit Plan, Benefit Obligation, Business Combination |
| Name: | us-gaap:DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation |
| Documentation: | Amount of increase in benefit obligation of defined benefit plan from business combination. |
| 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:DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation |
| Label | Role | Language |
| Defined Benefit Plan, Benefit Obligation, Business Combination | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (a)(8) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| Part Of Roll Up: |
| us-gaap:DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease |