| **Segment Information (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended                                                                                                           |                                                                                                                         |
|-----------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------|
||
| **Segment Reporting Information [Line Items]**                                    |                                                                                                                     |                                                                                                                    |   |
| Number of reportable segments                                                     | 3us-gaap_NumberOfReportableSegments                                                                                      |                                                                                                                    |   |
| Net sales                                                                         | $ 351,123us-gaap_SalesRevenueNet                                                                                         | $ 312,685us-gaap_SalesRevenueNet                                                                                        |   |
| Operating profit                                                                  | 39,193us-gaap_OperatingIncomeLoss                                                                                        | 31,266us-gaap_OperatingIncomeLoss                                                                                       |   |
| Other income (expense), net                                                       | (1,046)us-gaap_NonoperatingIncomeExpense                                                                                 | 3,678us-gaap_NonoperatingIncomeExpense                                                                                  |   |
| Earnings before income taxes                                                      | 38,147us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest                | 34,944us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest               |   |
| Identifiable assets                                                               | 1,899,384us-gaap_Assets                                                                                                  |                                                                                                                    | 1,888,769us-gaap_Assets |
| Engine/Mobile Filtration [Member]                                                 |                                                                                                                     |                                                                                                                    |   |
| **Segment Reporting Information [Line Items]**                                    |                                                                                                                     |                                                                                                                    |   |
| Net sales                                                                         | 144,458us-gaap_SalesRevenueNet/ us-gaap_StatementBusinessSegmentsAxis= clc_EngineandMobileFiltrationMember               | 122,497us-gaap_SalesRevenueNet/ us-gaap_StatementBusinessSegmentsAxis= clc_EngineandMobileFiltrationMember              |   |
| Operating profit                                                                  | 24,746us-gaap_OperatingIncomeLoss/ us-gaap_StatementBusinessSegmentsAxis= clc_EngineandMobileFiltrationMember            | 22,874us-gaap_OperatingIncomeLoss/ us-gaap_StatementBusinessSegmentsAxis= clc_EngineandMobileFiltrationMember           |   |
| Identifiable assets                                                               | 788,591us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= clc_EngineandMobileFiltrationMember                        |                                                                                                                    | 781,204us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= clc_EngineandMobileFiltrationMember |
| Industrial/Environmental Filtration [Member]                                      |                                                                                                                     |                                                                                                                    |   |
| **Segment Reporting Information [Line Items]**                                    |                                                                                                                     |                                                                                                                    |   |
| Net sales                                                                         | 190,916us-gaap_SalesRevenueNet/ us-gaap_StatementBusinessSegmentsAxis= clc_IndustrialandEnvironmentalFiltrationMember    | 174,863us-gaap_SalesRevenueNet/ us-gaap_StatementBusinessSegmentsAxis= clc_IndustrialandEnvironmentalFiltrationMember   |   |
| Operating profit                                                                  | 14,008us-gaap_OperatingIncomeLoss/ us-gaap_StatementBusinessSegmentsAxis= clc_IndustrialandEnvironmentalFiltrationMember | 8,146us-gaap_OperatingIncomeLoss/ us-gaap_StatementBusinessSegmentsAxis= clc_IndustrialandEnvironmentalFiltrationMember |   |
| Identifiable assets                                                               | 1,040,329us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= clc_IndustrialandEnvironmentalFiltrationMember           |                                                                                                                    | 1,022,996us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= clc_IndustrialandEnvironmentalFiltrationMember |
| Packaging [Member]                                                                |                                                                                                                     |                                                                                                                    |   |
| **Segment Reporting Information [Line Items]**                                    |                                                                                                                     |                                                                                                                    |   |
| Net sales                                                                         | 15,749us-gaap_SalesRevenueNet/ us-gaap_StatementBusinessSegmentsAxis= clc_PackagingMember                                | 15,325us-gaap_SalesRevenueNet/ us-gaap_StatementBusinessSegmentsAxis= clc_PackagingMember                               |   |
| Operating profit                                                                  | 439us-gaap_OperatingIncomeLoss/ us-gaap_StatementBusinessSegmentsAxis= clc_PackagingMember                               | 246us-gaap_OperatingIncomeLoss/ us-gaap_StatementBusinessSegmentsAxis= clc_PackagingMember                              |   |
| Identifiable assets                                                               | 38,881us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= clc_PackagingMember                                         |                                                                                                                    | 41,817us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= clc_PackagingMember |
| Corporate [Member]                                                                |                                                                                                                     |                                                                                                                    |   |
| **Segment Reporting Information [Line Items]**                                    |                                                                                                                     |                                                                                                                    |   |
| Identifiable assets                                                               | $ 31,583us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_CorporateMember                                   |                                                                                                                    | $ 42,752us-gaap_Assets/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_CorporateMember |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net result for the period of deducting operating expenses from operating revenues.
+ References
No definition available.
+ Details**Name:**us-gaap_OperatingIncomeLoss**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5
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| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                            |
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| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                     |
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