| Standard label: | Defined Benefit Plan, Benefit Obligation |
| Name: | us-gaap:DefinedBenefitPlanBenefitObligation |
| Documentation: | Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanBenefitObligation |
| Label | Role | Language |
| Defined Benefit Plan, Benefit Obligation | http://www.xbrl.org/2003/role/label | en-US |
| Defined Benefit Plan, Benefit Obligation, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Defined Benefit Plan, Benefit Obligation, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| Part Of Roll Up: |
| us-gaap:DefinedBenefitPlanFundedStatusOfPlan |