cm:Level3TextBlock: us-gaap:RestatementToPriorYearIncomeTextBlock
| Restatement to Prior Year Income [Table Text Block] |
| us-gaap:RestatementToPriorYearIncomeTextBlock |
| Tabular disclosure of the nature and effects of a restatement to correct an error in the reported results of operations of prior periods. When prior period adjustments are recorded, the resulting effects (both gross and net of applicable income tax) on the net income of prior periods are disclosed in the annual report for the year in which the adjustments are made, and amended filings of previously issued reports are typically issued. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RestatementToPriorYearIncomeTextBlock |
| RestatementOfPriorYearIncome |