cm:Level2TextBlock: us-gaap:EarningsPerSharePolicyTextBlock
| Earnings Per Share, Policy [Policy Text Block] |
| us-gaap:EarningsPerSharePolicyTextBlock |
| Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EarningsPerSharePolicyTextBlock |