cm:Concept: us-gaap:BusinessCombinationProFormaInformationDisclosureImpracticable
| Business Combination, Pro Forma Information, Disclosure Impracticable |
| us-gaap:BusinessCombinationProFormaInformationDisclosureImpracticable |
| If disclosure of the acquiree revenue and earnings since the date of acquisition which have been included in the income statement of the period or any of the required pro forma disclosure information required is impracticable, the element represents disclosure of that fact and an explanation of why the disclosure is impracticable (as defined). |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:BusinessCombinationProFormaInformationDisclosureImpracticable |