cm:Level1TextBlock: us-gaap:AccountingChangesAndErrorCorrectionsTextBlock
| Accounting Changes and Error Corrections [Text Block] |
| us-gaap:AccountingChangesAndErrorCorrectionsTextBlock |
| The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:AccountingChangesAndErrorCorrectionsTextBlock |
| AccountingChangesAndErrorCorrectionsDisclosures |