| Standard label: | Treasury Stock Acquired, Purchase Price Significantly in Excess of Current Fair Value, Description |
| Name: | us-gaap:TreasuryStockAcquiredPurchasePriceSignificantlyInExcessOfCurrentMarketPrice |
| Documentation: | Description of accounting treatment for treasury stock acquired at a price significantly in excess of the fair value. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:TreasuryStockAcquiredPurchasePriceSignificantlyInExcessOfCurrentMarketPrice |
| Label | Role | Language |
| Treasury Stock Acquired, Purchase Price Significantly in Excess of Current Fair Value, Description | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 505 30 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |
| FASB Accounting Standards Codification 505 30 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |