cm:Concept: us-gaap:ForwardContractIndexedToIssuersEquityForwardRate
| Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share |
| us-gaap:ForwardContractIndexedToIssuersEquityForwardRate |
| The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. |
| cm:Concept |
| Share (num:perShareItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ForwardContractIndexedToIssuersEquityForwardRate |