cm:Concept: us-gaap:FiniteLivedIntangibleAssetsIntentOrAbilityToRenewOrExtendArrangement
| Finite Lived Intangible Assets, Intent or Ability to Renew or Extend Arrangement |
| us-gaap:FiniteLivedIntangibleAssetsIntentOrAbilityToRenewOrExtendArrangement |
| A description of the entity's intent or ability to renew or extend the arrangement related to an intangible asset and how that affects expected future cash flows. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:FiniteLivedIntangibleAssetsIntentOrAbilityToRenewOrExtendArrangement |