| **Business Acquisitions, Investments and Redeemable Noncontrolling Interests (Bekaert Business) (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended             | 12 Months Ended            | 0 Months Ended             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------|----------------------------|----------------------------|
||
| **Business Acquisition [Line Items]**                                                                                                                       |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| Business acquisitions, net of cash acquired                                                                                                                 |                       |                       |                       |   |   |   |   |   | $ 595,328us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 5,411us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |   |
| Bargain purchase gain                                                                                                                                       |                       |                       |                       |   |   |   |   |   | 2,815clc_BargainPurchaseGainLossRecorded | 0clc_BargainPurchaseGainLossRecorded | 0clc_BargainPurchaseGainLossRecorded |   |
| Gross profit                                                                                                                                                | 139,753us-gaap_GrossProfit | 135,325us-gaap_GrossProfit | 125,370us-gaap_GrossProfit | 96,587us-gaap_GrossProfit | 98,609us-gaap_GrossProfit | 91,900us-gaap_GrossProfit | 98,214us-gaap_GrossProfit | 81,486us-gaap_GrossProfit | 497,035us-gaap_GrossProfit | 370,209us-gaap_GrossProfit | 380,332us-gaap_GrossProfit |   |
| Bekaert Advanced Filtration SA - Belgium [Member]                                                                                                           |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                       |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| Business acquisition, percentage of voting interests acquired                                                                                               |                       |                       |                       |   |   |   |   |   |   |   |   | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired/ us-gaap_BusinessAcquisitionAxis= clc_BekaertAdvancedFiltrationSABelgiumMember |
| Bekaert Advanced Filtration SA - Indonesia [Member]                                                                                                         |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                       |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| Business acquisition, percentage of voting interests acquired                                                                                               |                       |                       |                       |   |   |   |   |   |   |   |   | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired/ us-gaap_BusinessAcquisitionAxis= clc_BekaertAdvancedFiltrationSAIndonesiaMember |
| Bekaert Business [Member]                                                                                                                                   |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                       |                       |                       |                       |   |   |   |   |   |   |   |   |   |
| Business acquisitions, net of cash acquired                                                                                                                 |                       |                       |                       |   |   |   |   |   |   |   |   | 7,297us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired/ us-gaap_BusinessAcquisitionAxis= clc_BekaertBusinessMember |
| Acquired workforce, number of employees                                                                                                                     |                       |                       |                       |   |   |   |   |   |   |   |   | 170clc_BusinessAcquisitionAcquiredWorkforceNumberofEmployees/ us-gaap_BusinessAcquisitionAxis= clc_BekaertBusinessMember |
| Finite-lived intangible assets acquired                                                                                                                     |                       |                       |                       |   |   |   |   |   |   |   |   | 2,057us-gaap_FinitelivedIntangibleAssetsAcquired1/ us-gaap_BusinessAcquisitionAxis= clc_BekaertBusinessMember |
| Net sales                                                                                                                                                   |                       |                       |                       |   |   |   |   |   | 13,926us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual/ us-gaap_BusinessAcquisitionAxis= clc_BekaertBusinessMember |   |   |   |
| Gross profit                                                                                                                                                |                       |                       |                       |   |   |   |   |   | $ (21)us-gaap_GrossProfit/ us-gaap_BusinessAcquisitionAxis= clc_BekaertBusinessMember |   |   |   |

| X                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Bargain Purchase Gain (Loss) Recorded
+ References
No definition available.
+ Details**Name:**clc_BargainPurchaseGainLossRecorded**Namespace Prefix:**clc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Acquisition, Acquired Workforce, Number of Employees
+ References
No definition available.
+ Details**Name:**clc_BusinessAcquisitionAcquiredWorkforceNumberofEmployees**Namespace Prefix:**clc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of voting equity interests acquired at the acquisition date in the business combination.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463
+ Details**Name:**us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463
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| X                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.
+ References
No definition available.
+ Details**Name:**us-gaap_FinitelivedIntangibleAssetsAcquired1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.
+ 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 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585
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| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=clc_BekaertAdvancedFiltrationSAIndonesiaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=clc_BekaertBusinessMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |