| **Contingencies (Details) $ in Thousands**                                  |          |          | 3 Months Ended |
|-----------------------------------------------------------------------------|----------|----------|----------------|
||
| **Loss Contingencies [Line Items]**                                         |     |     |           |
| Number of jurors | Juror                                                    |     |     | 6              |
| TransWeb [Member]                                                           |     |     |           |
| **Loss Contingencies [Line Items]**                                         |     |     |           |
| Gain contingency not yet recognized                                         |     | $ 26,147 |           |
| Settled Litigation [Member] | TransWeb [Member] | Subsequent Event [Member] |     |     |           |
| **Loss Contingencies [Line Items]**                                         |     |     |           |
| Gain contingency not yet recognized                                         | $ 27,250 |     |           |

| X                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Loss Contingency, Number of Jurors
+ References
No definition available.
+ Details**Name:**clc_LossContingencyNumberofJurors**Namespace Prefix:**clc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of judgment or settlement awarded to (against) the entity in respect of litigation.
+ References
No definition available.
+ Details**Name:**us-gaap_LitigationSettlementAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_LossContingenciesLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=clc_TranswebMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LitigationStatusAxis=us-gaap_SettledLitigationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |