cm:Concept: us-gaap:IncreaseDecreaseInGiftCardLiability
| Increase (Decrease) in Gift Card Liability |
| us-gaap:IncreaseDecreaseInGiftCardLiability |
| The increase (decrease) during the reporting period in the obligation for outstanding gift cards. Retail customers purchase gift cards or gift certificates that can be redeemed at a later date for merchandise or services; those unredeemed represent a liability of the entity because the revenue is being deferred. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:IncreaseDecreaseInGiftCardLiability |