cm:Member: us-gaap:DistributionOfMarketableSecuritiesToStockholdersToRedeemOutstandingCapitalStockMember
| Distribution of Marketable Securities to Stockholders to Redeem Outstanding Capital Stock [Member] |
| us-gaap:DistributionOfMarketableSecuritiesToStockholdersToRedeemOutstandingCapitalStockMember |
| The distribution of nonmonetary assets such as marketable securities to stockholders to redeem or acquire outstanding capital stock of the enterprise. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:DistributionOfMarketableSecuritiesToStockholdersToRedeemOutstandingCapitalStockMember |