| Standard label: | Inventory Impairment, Policy [Policy Text Block] |
| Name: | us-gaap:InventoryImpairmentPolicy |
| Documentation: | Disclosure of accounting policy for recognizing inventory losses, including, but not limited to, substantial and unusual losses resulting from the subsequent measurement of inventory due to physical deterioration, obsolescence, or changes in price levels. |
| Object type: | cm:Level2TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InventoryImpairmentPolicy |
| Label | Role | Language |
| Inventory Impairment, Policy [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 10 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |
| FASB Accounting Standards Codification 330 10 35 2 | http://www.xbrl.org/2009/role/commonPracticeRef | 330 |