XML 124 R110.htm IDEA: XBRL DOCUMENT
v3.20.4

RESTRUCTURING AND ASSET IMPAIRMENTS - Additional Information (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
--- | --- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | $ 5,818 | $ 6,406 | $ 2,921 | $ 6,856
Severance and Transition Costs | Accrued Compensation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | $ 5,800 | 6,300 |  |
Severance and Transition Costs | Other Long-Term Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability |  | $ 100 |  |

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_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=crl_SeveranceAndTransitionCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=crl_AccruedCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |