cm:Concept: us-gaap:NewAccountingPronouncementTransitionGuidanceNotSignificantOrNotPractical
| New Accounting Pronouncement, Transition Guidance Not Significant or Not Practical |
| us-gaap:NewAccountingPronouncementTransitionGuidanceNotSignificantOrNotPractical |
| A description of the fact that the effect (or portion of the effect) of initially applying the pending content is not significant or not practicable to estimate. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:NewAccountingPronouncementTransitionGuidanceNotSignificantOrNotPractical |