cm:Level2TextBlock: us-gaap:SellingGeneralAndAdministrativeExpensesPolicyTextBlock
| Selling, General and Administrative Expenses, Policy [Policy Text Block] |
| us-gaap:SellingGeneralAndAdministrativeExpensesPolicyTextBlock |
| Disclosure of accounting policy for inclusion of significant items in the selling, general and administrative (or similar) expense report caption. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SellingGeneralAndAdministrativeExpensesPolicyTextBlock |