cm:Member: us-gaap:ExchangeOfProductHeldForSaleForSimilarProductMember
| Exchange of Product Held-for-sale for Similar Product [Member] |
| us-gaap:ExchangeOfProductHeldForSaleForSimilarProductMember |
| The exchange of a product held for sale in the ordinary course of business for similar property as an accommodation, to satisfy an immediate inventory need or otherwise reduce costs or facilitate ultimate sales. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ExchangeOfProductHeldForSaleForSimilarProductMember |