cm:Concept: us-gaap:EarningsPerShareDilutedUndistributed
| Earnings Per Share, Diluted, Undistributed |
| us-gaap:EarningsPerShareDilutedUndistributed |
| The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security, after giving effect to all dilutive potential common shares outstanding during the period. |
| cm:Concept |
| Share (num:perShareItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EarningsPerShareDilutedUndistributed |