| **Earnings Per Share and Stock Repurchase Activity (Details 3) (USD $)In Thousands, unless otherwise specified** | 0 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Stock Repurchase Program [Line Items]**                                                                        |           |           |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount                                                 |           | $ 187,682      |
| Stock Repurchase Program, Authorized Amount                                                                      | $ 250,000      |           |

| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**clc_StockRepurchaseProgramLineItems**Namespace Prefix:**clc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount authorized by an entity's Board of Directors under a stock repurchase plan.
+ References
No definition available.
+ Details**Name:**us-gaap_StockRepurchaseProgramAuthorizedAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.
+ References
No definition available.
+ Details**Name:**us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |