cm:Concept: us-gaap:ImmaterialErrorCorrection
| Immaterial Error Correction |
| us-gaap:ImmaterialErrorCorrection |
| Describes nature and related effect on financial statements related to corrections of prior year errors in the current year financial statements when the effect of the prior year error was immaterial to the prior year financial statements and the current year correction is immaterial to the current year financial statements. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ImmaterialErrorCorrection |