cm:Member: us-gaap:LossOnLongTermPurchaseCommitmentMember
| Loss on Long-term Purchase Commitment [Member] |
| us-gaap:LossOnLongTermPurchaseCommitmentMember |
| Estimated loss from pricing or market conditions arising from an obligation under a purchase commitment (evidenced by an executory contract which involves both an item that might be recorded as an asset and an item that might be recorded as a liability) with terms longer than one year or the normal operating cycle, if longer. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:LossOnLongTermPurchaseCommitmentMember |