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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | Mar. 27, 2021 | Dec. 26, 2020
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Revenue from Contract with Customer [Abstract] |  |
Client receivables | $ 463,800 | $ 489,042
Contract assets (unbilled revenue) | 154,044 | 135,400
Contract liabilities (current and long-term deferred revenue) | 233,075 | 227,417
Contract liabilities (customer contract deposits) | $ 36,652 | $ 42,244

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- Definition Contract With Customer Liability, Customer Deposits + References No definition available. + Details
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Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer Liability, Deferred Revenue + References No definition available. + Details
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Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for billed goods or services. + References No definition available. + Details
Name: | crl_TradeReceivablesFromCustomers
Namespace Prefix: | crl_
Data Type: | xbrli:monetaryItemType
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- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
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