XML 110 R48.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

BUSINESS COMBINATIONS AND DIVESTITURE - Definite Lived Intangible Assets (Details) - USD ($) $ in Thousands | Apr. 29, 2019 | Apr. 03, 2018 | Aug. 04, 2017
--- | --- | --- | ---
Citoxlab |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets | $ 162,400 |  |
Weighted Average Amortization Life | 12 years |  |
MPI Research |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  | $ 309,200 |
Weighted Average Amortization Life |  | 12 years |
Brains On-Line |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  |  | $ 9,300
Weighted Average Amortization Life |  |  | 12 years
Client relationships | Citoxlab |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets | $ 134,600 |  |
Weighted Average Amortization Life | 13 years |  |
Client relationships | MPI Research |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  | $ 264,900 |
Weighted Average Amortization Life |  | 13 years |
Client relationships | Brains On-Line |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  |  | $ 7,000
Weighted Average Amortization Life |  |  | 13 years
Developed technology | Citoxlab |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets | $ 19,900 |  |
Weighted Average Amortization Life | 3 years |  |
Developed technology | MPI Research |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  | $ 23,400 |
Weighted Average Amortization Life |  | 3 years |
Developed technology | Brains On-Line |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  |  | $ 2,300
Weighted Average Amortization Life |  |  | 10 years
Backlog | Citoxlab |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets | $ 7,900 |  |
Weighted Average Amortization Life | 1 year |  |
Backlog | MPI Research |  |  |
Business Acquisition [Line Items] |  |  |
Definite-Lived Intangible Assets |  | $ 20,900 |
Weighted Average Amortization Life |  | 1 year |

X
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=crl_CitoxlabMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=crl_MPIResearchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=crl_BrainsOnLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OrderOrProductionBacklogMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |