XML 93 R82.htm IDEA: XBRL DOCUMENT
v3.21.2

RESTRUCTURING AND ASSET IMPAIRMENTS - Narrative (Details) - USD ($) $ in Thousands | Sep. 25, 2021 | Jun. 26, 2021 | Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Dec. 28, 2019
--- | --- | --- | --- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance and other personnel related costs liability and lease obligation liabilities | $ 3,404 | $ 2,842 | $ 5,816 | $ 6,718 | $ 7,199 | $ 6,405
Severance and Transition Costs | Accrued Compensation and Accrued Liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance and other personnel related costs liability and lease obligation liabilities | $ 3,400 |  |  | 6,700 |  |
Severance and Transition Costs | Other Long-Term Liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance and other personnel related costs liability and lease obligation liabilities |  |  |  | $ 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://www.xbrl.org/2003/role/disclosureRef -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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -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: |