| Standard label: | Estimate of Cancellations |
| Name: | us-gaap:EstimateOfCancellations |
| Documentation: | Estimates of cancellations for refundable service fees, if accounted for by analogy to FASB Statement No. 48. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:EstimateOfCancellations |
| Label | Role | Language |
| Estimate of Cancellations | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 10 50 3 | http://fasb.org/us-gaap/role/ref/otherTransitionRef | 235 |