cm:Concept: us-gaap:EarningsPerSharePolicyDiluted
| Earnings Per Share Policy, Diluted |
| us-gaap:EarningsPerSharePolicyDiluted |
| Discloses the methodology and assumptions used to compute diluted earnings or loss per share for each class of common stock and participating security. Addresses 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:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EarningsPerSharePolicyDiluted |