cm:Concept: us-gaap:LeasePracticalExpedientsPackage
| Lease, Practical Expedients, Package [true false] |
| us-gaap:LeasePracticalExpedientsPackage |
| Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LeasePracticalExpedientsPackage |