Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Non-cash investing activities:
Noncash Investing Items [Abstract]
Noncash Investing Items
Biological assets, useful life
Biological Assets, Useful Life
Biological Assets, Useful Life
Trading Arrangement:
Trading Arrangement [Axis]
Unbilled revenue
Contract with Customer, Asset, before Allowance for Credit Loss, Current
Composition of Other Assets
Schedule of Other Assets, Noncurrent [Table Text Block]
Maximum
Maximum [Member]
Amortization of net loss, settlement losses, and prior service benefit included in total cost for pension and other post-retirement benefit plans
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax
Portion at Fair Value Measurement
Portion at Fair Value Measurement [Member]
RMS
RMS
Research Models and Services Segment [Member]
Represents Research Models and Services segment of the entity which includes sales of research models, genetically engineered models and services (GEMS), consulting and staffing services (CSS), research animal diagnostics, discovery services, in vitro and avian vaccine services.
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Title of 12(b) Security
Title of 12(b) Security
Book Value
Reported Value Measurement [Member]
Subsequent Event
Subsequent Event [Member]
Document Fiscal Year Focus
Document Fiscal Year Focus
Asset Impairments and Other Costs
Other Restructuring Costs
Performance obligations expected to be satisfied, expected timing
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Weighted average interest rate (as percent)
Debt, Weighted Average Interest Rate
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Other assets
Disposal Group, Including Discontinued Operation, Other Assets
Common stock, $0.01 par value; 120,000 shares authorized; 49,550 shares issued and 47,728 shares outstanding as of June 27, 2026, and 49,217 shares issued and outstanding as of December 27, 2025
Common Stock, Value, Issued
Accrued compensation
Employee-related Liabilities, Current
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
European Discovery Divestiture
European Discovery Divestiture [Member]
European Discovery Divestiture
Other long-term assets
Other Assets, Miscellaneous, Noncurrent
Treasury Shares and Accelerated Stock Repurchase Program (ASR) [Line Items]
Stock Repurchases [Line Items]
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.
Services and products transferred over time
Transferred over Time [Member]
Transaction and integration costs
Business Combination, Integration-Related Cost, Expense
Revolving facility
Line of Credit [Member]
Customer contract deposits (included in Other current liabilities)
Contract With Customer Liability, Customer Deposits
Contract With Customer Liability, Customer Deposits
Restatement Determination Date
Restatement Determination Date
Total debt and finance leases
Long-Term Debt, Gross And Lease Obligation
Long-Term Debt, Gross And Lease Obligation
Intangible Assets, Amortization Period
Intangible Assets, Amortization Period [Member]
Provisions
Accounts Receivable, Credit Loss Expense, Gross
Accounts Receivable, Credit Loss Expense, Gross
Write down of inventories
Inventory Write-down
K.F. Cambodia
K.F. Cambodia [Member]
K.F. Cambodia
Schedule Of Income Before Income Tax, And Effective Tax Rates
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Beginning balance
Ending balance
Accounts Receivable, Allowance for Credit Loss
Cash proceeds from divestiture
Proceeds from Divestiture of Businesses
Accrued interest on unrecognized tax benefits
Unrecognized Tax Benefits, Interest on Income Taxes Accrued
Increase in unrecognized tax benefits
Unrecognized Tax Benefits, Period Increase (Decrease)
Divestitures
Goodwill, Divestiture
Amendment Flag
Amendment Flag
Goodwill [Line Items]
Goodwill [Line Items]
Current liabilities:
Liabilities, Current [Abstract]
Liabilities
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Provision for credit losses
Accounts Receivable, Credit Loss Expense (Reversal)
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Developed technology
Developed Technology Rights [Member]
Adjustments for working capital
Business Combination, Adjustments for Working Capital
Business Combination, Adjustments for Working Capital
Assets
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Disposal Group Classification [Axis]
Disposal Group Classification [Axis]
Adjustment of previously recorded contingent liability
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Change In Previously Recorded Adjustment
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Change In Previously Recorded Adjustment
Property, plant and equipment, net
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment
Investments [Domain]
Investments [Domain]
Timing of Transfer of Good or Service [Domain]
Timing of Transfer of Good or Service [Domain]
Birgit Girshick [Member]
Birgit Girshick
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Property, plant, and equipment, net
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment
Contractually defined redemption value
Redeemable Noncontrolling Interest, Equity, Redemption Value
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets, by Major Class [Table]
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets, by Major Class [Table]
Disclosure of the major classes of finite-lived and indefinite-lived intangible assets showing the amount, any significant residual value, weighted average amortization period, and other characteristics. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company.
Property, Plant, and Equipment [Abstract]
Entity Address, State or Province
Entity Address, State or Province
4.25% Senior Notes due 2028
Senior Notes Due 2028 [Member]
Senior Notes Due 2028 [Member]
PEO Total Compensation Amount
PEO Total Compensation Amount
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Capital Expenditures
Segment Reporting, Long-Lived Asset, Expenditure for Addition
Other long-term liabilities measured at fair value:
Liabilities, Noncurrent [Abstract]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Basic (in shares)
Weighted-average shares outstanding - Basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Goodwill, impaired, accumulated impairment loss
Goodwill, Impaired, Accumulated Impairment Loss
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Share repurchase excise tax
Treasury Stock, Value, Acquired, Cost Method, Excise Tax
Treasury Stock, Value, Acquired, Cost Method, Excise Tax
Number of reportable segments
Number of Reportable Segments
Total current liabilities
Liabilities, Current
Work in process
Inventory, Work in Process, Net of Reserves
Client relationships
Client relationships
Customer Relationships [Member]
Entity Address, City or Town
Entity Address, City or Town
Schedule of Supplemental Cash Flow Information
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Operating lease right-of-use asset, net
Business Combination, Recognized Assets Acquired, Operating Lease, Right-of-Use Asset
Business Combination, Recognized Assets Acquired, Operating Lease, Right-of-Use Asset
Income before income taxes
Income (loss) before income taxes
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax
Other comprehensive income (loss), net of tax
Temporary Equity, Other Comprehensive Income (Loss), Net of Tax
Temporary Equity, Other Comprehensive Income (Loss), Net of Tax
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Total assets
Disposal Group, Including Discontinued Operation, Assets
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Product
Cost of products sold (excluding amortization of intangible assets)
Product [Member]
Intangible assets, net
Net
Intangible Asset, Finite-Lived, after Accumulated Amortization
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Operating lease right-of-use liabilities
Disposal Group, Including Discontinued Operation, Operating Lease, Liability
Disposal Group, Including Discontinued Operation, Operating Lease, Liability
Accumulated Amortization
Intangible Asset, Finite-Lived, Accumulated Amortization
Level 2
Fair Value, Inputs, Level 2 [Member]
Other income (expense)
Nonoperating Income (Expense) [Abstract]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Line of credit facility, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Current portion of long-term debt
Long-Term Debt, Current Maturities
Accrued penalties on unrecognized tax benefits
Unrecognized Tax Benefits, Income Tax Penalties Accrued
U.S.
UNITED STATES
Manufacturing
Manufacturing Support Segment [Member]
Manufacturing Support Segment
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Effect of Change in Accounting Estimate, Type [Domain]
Effect of Change in Accounting Estimate, Type [Domain]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Newly Adopted and Issued Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Supplemental Balance Sheet Information [Abstract]
Supplemental Balance Sheet Information [Table]
Purchases of Property, plant and equipment included in Accounts payable and Accrued liabilities
Capital Expenditures Incurred but Not yet Paid
Other current liabilities
Business Combination, Recognized Liability Assumed, Other Liability, Current
Land
Land [Member]
Deferred revenue
Increase (Decrease) in Contract with Customer, Liability
Gain on disposition of property plant equipment
Gain (Loss) on Disposition of Property Plant Equipment
Schedule of Revenue and Other Financial Information by Business Segment
Segment Reporting [Table Text Block]
Noncontrolling Interest
Noncontrolling Interest [Member]
Other comprehensive income (loss):
Other Comprehensive Income (Loss), before Tax [Abstract]
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Net current period other comprehensive income (loss)
Other Comprehensive Income (Loss), before Tax
Schedule of Rollforward of Contingent Consideration Related to Previous Acquisitions
Fair Value, Contingent Consideration [Table Text Block]
[Table Text Block] for Fair Value, Contingent Consideration [Table]
Assets from contracts with customers
Contract with Customer, Asset, after Allowance for Credit Loss [Abstract]
PROPERTY, PLANT AND EQUIPMENT, NET
Property, Plant, and Equipment [Text Block]
Document Period End Date
Document Period End Date
Changes in assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Operating lease right-of-use assets, net
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-use Assets, Net
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-use Assets, Net
Net cash used in investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Unrecognized tax benefits
Unrecognized Tax Benefits
Current liabilities
Disposal Group, Including Discontinued Operation, Liabilities, Current
Net income (loss)
Net Income (Loss), Including Portion Attributable To Noncontrolling Interest And Excluding Redeemable Noncontrolling Interest
Net Income (Loss), Including Portion Attributable To Noncontrolling Interest And Excluding Redeemable Noncontrolling Interest
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding
EQUITY AND NONCONTROLLING INTERESTS
Equity [Text Block]
Costs and expenses
Costs and Expenses [Abstract]
Security Exchange Name
Security Exchange Name
Schedule of Equity Method Investments [Roll Forward]
Schedule of Equity Method Investments [Roll Forward]
Schedule of Equity Method Investments
Treasury stock, at cost, 1,822 and zero shares, as of June 27, 2026 and December 27, 2025, respectively
Treasury Stock, Common, Value
Birgit Girshick Rule Trading Arrangement, Common Stock [Member]
Birgit Girshick Rule Trading Arrangement, Common Stock
Proceeds from sale of businesses and assets, net
Proceeds from Sales of Business, Affiliate and Productive Assets
SUPPLEMENTAL CASH FLOW INFORMATION
Cash Flow, Supplemental Disclosures [Text Block]
Total liabilities measured at fair value
Liabilities, Fair Value Disclosure
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Entity Shell Company
Entity Shell Company
Consolidation Items [Domain]
Consolidation Items [Domain]
Schedule of Allowance for Credit Losses
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
Segment Reporting
Segment Reporting, Policy [Policy Text Block]
Increase in unrecognized tax benefits that would impact effective tax rate
Increase (Decrease) In Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Increase (Decrease) In Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Schedule of Composition of Property, Plant and Equipment, Net
Property, Plant, and Equipment [Table Text Block]
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Trademarks and trade names
Trademarks and Trade Names [Member]
Name
Outstanding Recovery, Individual Name
Proceeds from sale of investments
Proceeds from Sale and Maturity of Marketable Securities
Earnings (loss) per common share
Earnings Per Share [Abstract]
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Document Fiscal Period Focus
Document Fiscal Period Focus
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Total liabilities
Liabilities
Trading Symbol
Trading Symbol
4.00% Senior Notes due 2031
Senior Notes Due 2031 [Member]
Senior Notes Due 2031
Geographical [Domain]
Geographical [Domain]
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Accrued income taxes
Accrued Income Taxes, Current
DSA
DSA
Discovery and Safety Assessment Segment [Member]
Weighted-average number of common shares outstanding
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Schedule of Purchase Price Allocation
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]
Company Selected Measure Name
Company Selected Measure Name
Schedule of Investments [Table]
Schedule of Investments [Table]
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Capital contributions
Equity Method Investments, Capital Contributions
Equity Method Investments, Capital Contributions
Equity interest (as percent)
Subsidiary, Ownership Percentage, Parent
Pension and Other Post-Retirement Benefit Plans
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Long-term debt, gross
Long-Term Debt, Gross
Reduction for acquisition of entities
Equity Method Investments, Decrease Due To Acquisition
Equity Method Investments, Decrease Due To Acquisition
Credit Facility [Domain]
Credit Facility [Domain]
Cash flows relating to operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Other
Other Sundry Liabilities, Noncurrent
Compensation Amount
Outstanding Recovery Compensation Amount
Individual:
Individual [Axis]
Percentage of voting interests acquired
Business Combination, Voting Equity Interest Acquired, Percentage
Diluted (in shares)
Weighted-average shares outstanding - Diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
(Gains) losses and impairments on venture capital and strategic equity investments, net
Venture Capital And Equity Method Investments, Gain (Loss) And Impairments, Net
Venture Capital And Equity Method Investments, Gain (Loss) And Impairments, Net
Emerging Growth Company
Entity Emerging Growth Company
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
Disposal Group Name [Domain]
Disposal Group Name [Domain]
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Deferred income taxes
Deferred Income Taxes and Tax Credits
Property, plant and equipment, net
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Other non-cash adjustments
Restructuring Reserve, Accrual Adjustment
Goodwill deductible for tax purposes
Business Combination, Goodwill, Expected Tax Deductible, Amount
Schedule of Disposal Groups, Including Discontinued Operations
Disposal Groups, Including Discontinued Operations [Table Text Block]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Other
Other Intangible Assets [Member]
Other assets and liabilities, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Long-lived asset impairments
Long-Lived Asset, Held and Used, Impairment Loss
Award Timing Predetermined
Award Timing Predetermined [Flag]
Restricted cash included in Other current assets
Restricted Cash, Current
Treasury Stock
Treasury Stock, Common [Member]
Intangible Asset, Goodwill and Other [Abstract]
Intangible Asset, Goodwill and Other [Abstract]
Letters of credit outstanding
Letters of Credit Outstanding, Amount
Severance and Transition Costs
Severance Costs
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Stock-based compensation
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Level 1
Fair Value, Inputs, Level 1 [Member]
Net provision (recovery) expense
Accounts Receivable, Credit Loss Expense (Reversal), Net Of Recovery
Accounts Receivable, Credit Loss Expense (Reversal), Net Of Recovery
Effective tax rate (as percent)
Effective Income Tax Rate Reconciliation, Percent
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
CDMO and Cell Solutions Divestiture
CDMO and Cell Solutions Divestiture [Member]
CDMO and Cell Solutions Divestiture
Stock options, restricted stock units and performance share units (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Percentage of contract liabilities recognized as revenue during period
Contract With Customer, Percentage Of Liabilities, Recognized As Revenue
Contract With Customer, Percentage Of Liabilities, Recognized As Revenue
All Executive Categories
All Executive Categories [Member]
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Redeemable noncontrolling interests
Beginning balance
Ending balance
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Depreciation
Depreciation
Intangible assets, net
Disposal Group, Including Discontinued Operation, Intangible Assets
Operating lease right-of-use assets, net
Operating Lease, Right-of-Use Asset
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Schedule of Reconciliation of the Numerator and Denominator in the Computations of the Basic and Diluted Earnings (Loss) Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Total purchase price allocation
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Current portion of long-term debt and finance leases
Long-Term Debt and Lease Obligation, Current
SEGMENT AND GEOGRAPHIC INFORMATION
Segment Reporting [Text Block]
Minimum
Minimum [Member]
Investment Type [Axis]
Investment Type [Axis]
Expiration Date
Trading Arrangement Expiration Date
Schedule of Disaggregation of Revenue
Schedule of Revenue by Geographic Area
Disaggregation of Revenue [Table Text Block]
Denominator:
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Schedule of Intangible Asset, Finite-Lived, Amortization Expense
Intangible Asset, Finite-Lived, Amortization Expense [Table Text Block]
Effect of exchange rate changes on cash, cash equivalents, and restricted cash
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Total equity
Beginning balance
Ending balance
Equity, Including Portion Attributable to Noncontrolling Interest
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]
Buildings
Building [Member]
Timing of Transfer of Good or Service [Axis]
Timing of Transfer of Good or Service [Axis]
Business combination, equity stake percentage
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Percentage
Disposal Group, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operations [Line Items]
Business Combination [Line Items]
Business Combination [Line Items]
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Trade receivables
Business Combination, Recognized Asset Acquired, Receivable, Current
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Biological assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Biological Assets, Noncurrent
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Biological Assets, Noncurrent
Value of previously owned interest in acquiree
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value
Exercise Price
Award Exercise Price
Schedule of Restructuring and Related Costs [Table]
Restructuring Cost [Table]
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Aggregate authorization of share repurchase program (in shares)
Share Repurchase Program, Authorized, Amount
Segment Reporting [Line Items]
Segment Reporting [Line Items]
Long-term debt and finance leases
Long-Term Debt And Lease Obligation, Net Of Current Portion
Long-Term Debt And Lease Obligation, Net Of Current Portion
Document Quarterly Report
Document Quarterly Report
Life insurance policies
Cash Surrender Value, Fair Value Disclosure
Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table]
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]
Segments [Domain]
Segments [Domain]
Europe
Europe [Member]
Schedule of Long-Lived Assets by Geographic Area
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Table Text Block]
DEBT AND OTHER FINANCING ARRANGEMENTS
Debt Disclosure [Text Block]
Disposal Group Classification [Domain]
Disposal Group Classification [Domain]
Debt discount and debt issuance costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Schedule of Restructuring Costs
Restructuring and Related Costs [Table Text Block]
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Venture capital and strategic equity investments
Beginning balance
Ending balance
Equity Method Investments
Beginning balance
Ending Balance
Restructuring reserve
Restructuring Reserve
Business Combination [Table]
Business Combination [Table]
ACQUISITIONS AND DIVESTITURES
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Equity Component [Domain]
Equity Component [Domain]
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Total
Accounts Receivable, before Allowance for Credit Loss, Current
Adoption Date
Trading Arrangement Adoption Date
Purchase of investments
Payments to Acquire Equity Method Investments
Liabilities from contracts with customers
Contract with Customer, Liability [Abstract]
Stated interest rate (as percent)
Debt Instrument, Interest Rate, Stated Percentage
Total Charles River Laboratories International, Inc. equity
Equity, Attributable to Parent
Other assets
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Restructuring Type [Axis]
Restructuring Type [Axis]
Disposal group, including discontinued operation, contingent consideration
Disposal Group, Including Discontinued Operation, Contingent Consideration
Disposal Group, Including Discontinued Operation, Contingent Consideration
Assets
Assets [Abstract]
Title
Trading Arrangement, Individual Title
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Insider Trading Policies and Procedures [Line Items]
Finance leases
Finance Lease, Liability
Other, net
Proceeds from (Payment for) Other Financing Activity
Allowance for credit losses
Less: Allowance for credit losses
Accounts Receivable, Allowance for Credit Loss, Current
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Long term tax liability
Accrued Income Taxes, Noncurrent
Other current assets
Prepaid Expense and Other Assets, Current
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Selling, general and administrative
Selling, General and Administrative Expense
Long-term liabilities
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent
SUPPLEMENTAL BALANCE SHEET INFORMATION
Supplemental Balance Sheet Disclosures [Text Block]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Business Combination [Domain]
Business Combination [Domain]
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Anti-dilutive common stock equivalents (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Schedule of Goodwill
Goodwill [Table Text Block]
Beginning balance
Ending balance
Goodwill, Gross
Entity Central Index Key
Entity Central Index Key
Less: Accumulated depreciation
Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization
Additional paid-in capital
Additional Paid in Capital, Common Stock
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Unallocated corporate
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Business Combination [Axis]
Business Combination [Axis]
Equity [Abstract]
Equity [Abstract]
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member]
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Revenue, remaining performance obligation, percentage
Revenue, Remaining Performance Obligation, Percentage
Total liabilities
Disposal Group, Including Discontinued Operation, Liabilities
Equity:
Equity, Attributable to Parent [Abstract]
Income Statement [Abstract]
Income Statement [Abstract]
Document Transition Report
Document Transition Report
Ownership [Axis]
Ownership [Axis]
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Maximum contingent contractual payments
Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum Amount
Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum Amount
Deferred tax assets
Deferred Income Tax Assets, Net
Schedule of Prepaid and Accrued Tax Positions
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Segment operating income
Reportable Segment, Aggregation before Other Operating Segment [Member]
Schedule of Intangible Assets
Intangible Asset, Finite-Lived [Table Text Block]
Variable rate (as percent)
Debt Instrument, Basis Spread on Variable Rate
Percentage of unbilled revenue billed during period
Contract With Customer, Asset, Percentage Of Amount Reclassified To Receivable
Contract With Customer, Asset, Percentage Of Amount Reclassified To Receivable
Other current assets (excluding cash)
Business Combination, Recognized Asset Acquired, Other Asset, Current
City Area Code
City Area Code
Variable Rate [Domain]
Variable Rate [Domain]
PathoQuest SAS
Pathoquest [Member]
Pathoquest
Accumulated Other Comprehensive Income (Loss)
Total
AOCI Attributable to Parent [Member]
Strategic Investments
Strategic Investments [Member]
Strategic Investments
All Individuals
All Individuals [Member]
Debt instrument value
Debt Instrument, Fair Value Disclosure
Long-term pension liability, accrued executive supplemental life insurance retirement plan and deferred compensation plan
Liability, Defined Benefit Pension Plan, Noncurrent
Name
Forgone Recovery, Individual Name
Finished products
Inventory, Finished Goods, Net of Reserves
Contingent consideration
Business Combination, Contingent Consideration, Liability, Noncurrent
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
Statement [Line Items]
Statement [Line Items]
Venture Capital Funds
Venture Capital Funds [Member]
Total assets
Assets
Composition of other long-term liabilities
Other Liabilities, Noncurrent [Abstract]
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Operating Segments
Operating Segments [Member]
Interest expense
Interest Expense, Nonoperating
Other comprehensive income (loss)
Other Comprehensive Income (Loss), before Reclassifications, before Tax
Operating lease right-of-use liabilities
Business Combination, Recognized Liability Assumed, Lease Obligation
PEO
PEO [Member]
Life insurance policies
Cash Surrender Value of Life Insurance
Measurement Basis [Axis]
Measurement Basis [Axis]
Other long-term liabilities
Other long-term liabilities
Other Liabilities, Noncurrent
Goodwill
Goodwill
Inventories
Business Combination, Recognized Asset Acquired, Inventory, Current
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Acquisitions
Goodwill, Acquired During Period
Bearer biological assets
Bearer Biological Assets, Noncurrent
Bearer Biological Assets, Noncurrent
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Equity interest acquired (as percent)
Business Combination, Achieved in Stages, Preacquisition and Acquired Equity Interests in Acquiree, Percentage
Retained Earnings
Retained Earnings [Member]
Operating lease right-of-use liabilities
Operating Lease, Liability, Noncurrent
Revolving Credit Facility
Revolving Credit Facility [Member]
Total gains or losses (realized/unrealized):
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Increase (Decrease) in Stockholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding
Award Timing Disclosures [Line Items]
Foreign Currency Translation Adjustment and Other
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Diluted (in dollars per share)
Earnings Per Share, Diluted
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Entity Current Reporting Status
Entity Current Reporting Status
Net cash provided by (used in) financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Total Shareholder Return Amount
Total Shareholder Return Amount
Shares acquired to satisfy minimum individual statutory tax withholdings for vesting of equity instruments
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
Gains (losses) and impairments
Income (Loss) from Equity Method Investments And Other-Than-Temporary Impairment
Income (Loss) from Equity Method Investments And Other-Than-Temporary Impairment
Composition of other assets
Other Assets, Noncurrent [Abstract]
Accrued compensation
Increase (Decrease) in Employee Related Liabilities
Amortization of intangible assets
Intangible Asset, Finite-Lived, Amortization Expense
Ownership [Domain]
Ownership [Domain]
Reductions
Accounts Receivable, Allowance for Credit Loss, Writeoff
Property, plant and equipment, net
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization
Total revenue
Revenue
Revenue from Contract with Customer, Excluding Assessed Tax
Current assets
Disposal Group, Including Discontinued Operation, Assets, Current
Schedule of Rollforward of Company's Severance and Retention Costs Liability
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Schedule of Equity Method Investments
Equity Method Investments [Table Text Block]
Accrued liabilities measured at fair value:
Other Liabilities, Current, Fair Value Disclosure [Abstract]
Other Liabilities, Current, Fair Value Disclosure
INVENTORY
Inventory Disclosure [Text Block]
Intangible Asset, Finite-Lived, Class [Axis]
Intangible Asset, Finite-Lived, Class [Axis]
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
GOODWILL AND INTANGIBLE ASSETS
Intangible Asset and Goodwill [Text Block]
Underlying Securities
Award Underlying Securities Amount
Less: Comprehensive income (loss) related to noncontrolling interests, net of income taxes
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Fair Value
Estimate of Fair Value Measurement [Member]
REVENUE FROM CONTRACTS WITH CUSTOMERS
Revenue from Contract with Customer [Text Block]
Prepaid assets
Prepaid Expense, Current
Construction in progress
Construction in Progress [Member]
Raw materials and supplies
Inventory, Raw Materials and Supplies, Net of Reserves
Other, net
Payment for (Proceeds from) Other Investing Activity
Inventories
Increase (Decrease) in Inventories
Severance and Transition Costs
Severance And Transition Costs [Member]
Severance And Transition Costs [Member]
Obligation to cover future EBITDA losses and capital expenditures, period
Disposal Group, Including Discontinued Operation, Consideration, Obligation To Cover Future EBITDA Losses And Capital Expenditures, Period
Disposal Group, Including Discontinued Operation, Consideration, Obligation To Cover Future EBITDA Losses And Capital Expenditures, Period
Segment Reporting [Table]
Segment Reporting [Table]
Net income (loss)
Temporary Equity, Net Income
3.75% Senior Notes due 2029
Senior Notes Due 2029 [Member]
Senior Notes Due 2029
Schedule of Equity Method Investments [Table]
Equity Method Investment [Table]
Computer hardware and software
Computer Equipment [Member]
Cash flows relating to investing activities
Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract]
Contingent consideration
Business Combination, Contingent Consideration, Liability, Current
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
All Trading Arrangements
All Trading Arrangements [Member]
Beginning balance
Ending balance
Fair value of contingent consideration
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Other Performance Measure, Amount
Other Performance Measure, Amount
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Operating income
Operating Income (Loss)
Service
Cost of services provided (excluding amortization of intangible assets)
Service [Member]
Asia Pacific
Asia Pacific [Member]
Performance obligations expected to be satisfied
Revenue, Remaining Performance Obligation, Amount
Current Fiscal Year End Date
Current Fiscal Year End Date
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Property, plant and equipment, net
Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount
Vehicles
Vehicles [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]
Entity File Number
Entity File Number
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Issuance of stock under employee compensation plans
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture
Proceeds from life insurance policy
Proceeds from Life Insurance Policy
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Common stock, shares issued (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Common Stock, Shares, Issued
Measure:
Measure [Axis]
Other
Other [Member]
Other [Member]
Treasury stock, shares (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Treasury Stock, Common, Shares
Supplemental Balance Sheet Information [Line Items]
Supplemental Balance Sheet Information [Line Items]
Supplemental Balance Sheet Information
Unpaid advanced client billings
Contract With Customer, Unpaid Advanced Client Billings
Contract With Customer, Unpaid Advanced Client Billings
Equity Components [Axis]
Equity Components [Axis]
Trade receivables and contract assets, net
Increase (Decrease) in Accounts Receivable
Product and Service [Domain]
Product and Service [Domain]
Cash paid for income taxes
Income Tax Paid, after Refund Received
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Entity Interactive Data Current
Entity Interactive Data Current
Variable Rate [Axis]
Variable Rate [Axis]
Current portion of finance leases
Finance Lease, Liability, Current
Less: Net income attributable to noncontrolling interests
Less: Net income attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Deferred tax liabilities
Deferred Income Tax Liabilities, Net
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
Smaller Reporting Company
Entity Small Business
Comprehensive income (loss) attributable to Charles River Laboratories International, Inc., net of income taxes
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Termination Date
Trading Arrangement Termination Date
Shares acquired to satisfy minimum individual statutory tax withholdings for vesting of equity instruments (in shares)
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation
Property, Plant, and Equipment [Line Items]
Property, Plant, and Equipment [Line Items]
Weighted Average Amortization Life
Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period
Payments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Intangible assets, net
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Other current liabilities
Other Liabilities, Current
Other assets
Other assets
Other Assets, Noncurrent
Amortization of inventory step up
Amortization Of Inventory Step Up
Amortization Of Inventory Step Up
Cash flows relating to financing activities
Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract]
Document Type
Document Type
Acquisition of businesses and assets, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accrued liabilities
Accrued Liabilities, Current
Fair Value as of Grant Date
Award Grant Date Fair Value
Gain on sale of assets
Gain (Loss) on Disposition of Assets
Schedule of Goodwill [Table]
Goodwill [Table]
Increase (Decrease) in Temporary Equity
Increase (Decrease) in Temporary Equity [Roll Forward]
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Remaining authorized repurchase amount
Share Repurchase Program, Remaining Authorized, Amount
Deferred revenue
Business Combination, Recognized Liability Assumed, Deferred Revenue, Current
Arrangement Duration
Trading Arrangement Duration
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Proceeds from long-term debt and revolving credit facility
Proceeds from Issuance of Long-Term Debt
Local Phone Number
Local Phone Number
Long-term deferred revenue (included in Other long-term liabilities)
Deferred revenue
Contract with Customer, Liability, Noncurrent
Canada
CANADA
Consolidation Items [Axis]
Consolidation Items [Axis]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Entity Registrant Name
Entity Registrant Name
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Commitments and contingencies (Notes 2, 12, 14, and 16)
Commitments and Contingencies
Gross
Intangible Asset, Finite-Lived, before Accumulated Amortization
Composition of Other Long-Term Liabilities
Other Noncurrent Liabilities [Table Text Block]
Total
Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Machinery and equipment
Machinery and Equipment [Member]
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Executive Category:
Executive Category [Axis]
Adjustment of redeemable noncontrolling interests to redemption value
Dividends declared to noncontrolling interests
Noncontrolling Interest, Increase (Decrease) in Redemption Value
Noncontrolling Interest, Increase (Decrease) in Redemption Value
Stock Repurchase Authorization
Stock Repurchase Authorization [Member]
Stock Repurchase Authorization
Less: Income tax expense (benefit) related to items of other comprehensive income
Income tax (benefit) expense
Other Comprehensive Income (Loss), Tax
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Furniture and fixtures
Furniture and Fixtures [Member]
Services and products transferred at a point in time
Transferred at Point in Time [Member]
Liabilities, Redeemable Noncontrolling Interests and Equity
Liabilities and Equity [Abstract]
Intangible Asset, Finite-Lived, Class [Domain]
Intangible Asset, Finite-Lived, Class [Domain]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Inventories
Inventories
Inventory, Net
All Award Types
Award Type [Domain]
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
FAIR VALUE
Fair Value Disclosures [Text Block]
Level 3
Fair Value, Inputs, Level 3 [Member]
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information [Abstract]
Other Costs
Other Costs [Member]
Other Costs
Sales-type lease, revenue
Sales-type Lease, Revenue
Purchase of treasury shares (in shares)
Treasury Stock, Shares, Acquired
Noncontrolling interest ownership percentage
Subsidiary, Ownership Percentage, Noncontrolling Owner
PEO Name
PEO Name
Geographical [Axis]
Geographical [Axis]
Leasehold improvements
Leasehold Improvements [Member]
Contract liabilities
Contract with Customer, Liability
Purchase of remaining equity interests of other redeemable noncontrolling interest
Payments For Additional Equity Interests
Payments For Additional Equity Interests
Property, Plant and Equipment, Type [Axis]
Long-Lived Asset, Class [Axis]
Cash acquired
Cash Acquired from Acquisition
Payments of contingent consideration
Payment for Contingent Consideration Liability, Financing Activities
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Foreign currency translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax
Entity Tax Identification Number
Entity Tax Identification Number
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Liability Class [Axis]
Liability Class [Axis]
Purchase of treasury shares
Purchase of treasury shares
Treasury Stock, Value, Acquired, Cost Method
Payments / utilization
Payments for Restructuring
Cash, cash equivalents, and restricted cash, beginning of period
Cash, cash equivalents, and restricted cash, end of period
Cash, cash equivalents, and restricted cash, end of period
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Accounts payable
Increase (Decrease) in Accounts Payable
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Additions
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Non-NEOs
Non-NEOs [Member]
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]
BASIS OF PRESENTATION
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Comprehensive income (loss), net of income taxes
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Debt Instrument [Axis]
Debt Instrument [Axis]
Other long-term liabilities
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent
Payments to acquire businesses, gross
Payments to Acquire Businesses, Gross
Stock-based compensation
Share-Based Payment Arrangement, Noncash Expense
Book value of assets derecognized
Property, Plant, and Equipment, before Accumulated Depreciation, Disposition
Disposal Group Name [Axis]
Disposal Group Name [Axis]
Schedule of Long-term Debt and Finance Lease Obligations
Schedule of Debt [Table Text Block]
Schedule of Composition of Inventories
Schedule of Inventory, Current [Table Text Block]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Basic (in dollars per share)
Earnings Per Share, Basic
Adjustment of redeemable noncontrolling interests to redemption value
Temporary Equity, Accretion to Redemption Value
Purchase of treasury stock
Payments for Repurchase of Common Stock
Deferred revenue
Current deferred revenue
Contract with Customer, Liability, Current
Other intangible assets
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Total current assets
Assets, Current
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Insider Trading Arrangements [Line Items]
Payments on long-term debt, revolving credit facility, and finance lease obligations
Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security
Credit Facility
Credit Facility [Member]
Credit Facility
Other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Including Portion Attributable To Noncontrolling Interest and Excluding Redeemable Noncontrolling Interest, Net of Tax
Other Comprehensive Income (Loss), Including Portion Attributable To Noncontrolling Interest and Excluding Redeemable Noncontrolling Interest, Net of Tax
Award Type
Award Type [Axis]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
Trade receivables and contract assets, net of allowances for credit losses of $8,715 and $10,463, respectively
Trade receivables and contract assets, net
Accounts Receivable, after Allowance for Credit Loss, Current
Retained earnings
Retained Earnings (Accumulated Deficit)
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities [Abstract]
Product and Service [Axis]
Product and Service [Axis]
Restricted cash included in Other assets
Restricted cash
Restricted Cash, Noncurrent
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Common Stock
Common Stock [Member]
(Gain) loss on divestitures, net
Gain (loss) on disposition of business
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets, by Major Class [Line Items]
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets, by Major Class [Line Items]
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets, by Major Class [Line Items]
Effect of Change in Accounting Estimate, Type [Axis]
Effect of Change in Accounting Estimate, Type [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Deferred purchase price
Business Combination, Contingent Consideration, Liability
VENTURE CAPITAL AND STRATEGIC EQUITY INVESTMENTS
Investments In Limited Partnerships [Text Block]
Investments in Limited Partnerships [Text Block]
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Cover page.
Cover [Abstract]
Foreign exchange
Goodwill, Foreign Currency Translation, Gain (Loss)
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Assets held for sale
Disposal Group, Including Discontinued Operation, Assets, Noncurrent
Total liabilities, redeemable noncontrolling interests and equity
Liabilities and Equity
Obligation to cover future EBITDA losses and capital expenditures
Disposal Group, Including Discontinued Operation, Consideration, Obligation To Cover Future EBITDA Losses And Capital Expenditures
Disposal Group, Including Discontinued Operation, Consideration, Obligation To Cover Future EBITDA Losses And Capital Expenditures
RESTRUCTURING AND ASSET IMPAIRMENTS
Restructuring, Impairment, and Other Activities Disclosure [Text Block]
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table]
Nonredeemable noncontrolling interest
Equity, Attributable to Noncontrolling Interest
Carrying value of life insurance policies
Life Insurance, Corporate or Bank Owned, Amount
Segments [Axis]
Segments [Axis]
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Total
Total
Expense
Restructuring Charges
Inventory Disclosure [Abstract]
Tabular List, Table
Tabular List [Table Text Block]
Other (expense) income, net
Other Nonoperating Income (Expense)
Total Charles River Laboratories, Inc. Equity
Parent [Member]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Purchases of investments and contributions to venture capital investments
Payments to Acquire Investments
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]
Property, Plant and Equipment, Type [Domain]
Long-Lived Asset, Class [Domain]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Property, Plant, and Equipment [Table]
Property, Plant, and Equipment [Table]
Preferred stock, $0.01 par value; 20,000 shares authorized; no shares issued and outstanding
Preferred Stock, Value, Issued
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Other debt
Other Long-term Debt [Member]
Represents other debt instruments not elsewhere specified in the taxonomy.
Schedule of Business Combination, Intangible Asset, Acquired, Finite-Lived
Business Combination, Intangible Asset, Acquired, Finite-Lived [Table Text Block]
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Prepaid income tax
Prepaid Taxes
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activity
Capital expenditures
Payments to Acquire Productive Assets
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Customer contract deposits
Increase (Decrease) In Contract With Customer Liability, Customer Deposits
Increase (Decrease) In Contract With Customer Liability, Customer Deposits
Contingent Consideration
Contingent Consideration [Member]
Represents potential amounts payable by the entity as contingent consideration in connection with a business acquisition.
Credit Facility [Axis]
Credit Facility [Axis]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Total assets measured at fair value
Assets, Fair Value Disclosure
Long-term debt, net and finance leases
Long-Term Debt and Lease Obligation
Asset Impairments
Asset Impairments [Member]
Asset Impairments
Birgit Girshick Rule Trading Arrangement, Stock Options [Member]
Birgit Girshick Rule Trading Arrangement, Stock Options
Name
Measure Name
INCOME TAXES
Income Tax Disclosure [Text Block]
Schedule of Stock Repurchases [Table]
Schedule of Stock Repurchases [Table]
Schedule detailing information relating to stock repurchases.
Accounts payable
Accounts Payable, Current
Pay vs Performance Disclosure [Line Items]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
Other, net
Other Noncash Income (Expense)
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Purchase price
Business Combination, Consideration Transferred
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Entity Filer Category
Entity Filer Category
Accelerated amortization of intangible assets
Accelerated Amortization Of Intangible Assets
Accelerated Amortization Of Intangible Assets
Name
Trading Arrangement, Individual Name
Noveprim Group
Noveprim Group [Member]
Noveprim Group
Cash and cash equivalents
Cash and cash equivalents
Cash and Cash Equivalent
Foreign currency adjustments
Restructuring Reserve, Foreign Currency Translation Gain (Loss)
Company Selected Measure Amount
Company Selected Measure Amount
Distributions
Proceeds from Equity Method Investment, Distribution
Client receivables
Trade Receivables from Customers
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.
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures [Abstract]
Depreciation and amortization
Depreciation and amortization
Depreciation, Depletion and Amortization
SOFR rate
Secured Overnight Financing Rate (SOFR) [Member]
Issuance of stock under employee compensation plans (in shares)
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture
Net income (loss)
Net income (loss)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Assets acquired under finance leases
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Unrecognized tax benefits that would impact effective tax rate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Current assets:
Other assets measured at fair value:
Assets, Current [Abstract]
Non-PEO NEO
Non-PEO NEO [Member]
Senior Notes
Senior Notes [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Provision for income taxes
Income Tax Expense (Benefit)
Effect of dilutive securities:
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract]
Cost of revenue (excluding amortization of intangible assets)
Cost of Product and Service Sold
Technology
Technology-Based Intangible Assets [Member]
Award Timing Method
Award Timing Method [Text Block]
Selling, general and administrative
Product and Service, Other [Member]
Consolidation
Consolidation, Policy [Policy Text Block]
Net change in cash, cash equivalents, and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Numerator:
Net Income (Loss) Attributable to Parent [Abstract]
Foreign currency translation
Equity Method Investment, Foreign Currency Translation
Equity Method Investment, Foreign Currency Translation
Net income (loss) attributable to common shareholders
Net Income (Loss) Attributable to Parent
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Other comprehensive income (loss), before income taxes
Other Comprehensive Income (Loss), Before Income Taxes
Other Comprehensive Income (Loss), Before Income Taxes
Proceeds from sale of property, plant, and equipment
Proceeds from Sale of Property, Plant, and Equipment
Goodwill
Disposal Group, Including Discontinued Operation, Goodwill
Statement [Table]
Statement [Table]
Long-term pension assets
Pension Plan Assets, Non-Current
Pension Plan Assets, Non-Current
Supplemental Balance Sheet Information [Abstract]
Supplemental Balance Sheet Information
Restatement Determination Date:
Restatement Determination Date [Axis]
Proceeds from exercises of stock options
Proceeds from Stock Options Exercised
Schedule of Accumulated Other Comprehensive Income (Loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Interest income
Investment Income, Interest
Schedule of Client Receivables, Contract Assets and Contract Liabilities
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Federal Funds Rate
Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Dividends declared to noncontrolling interests
Temporary Equity, Dividends to Redeemable Noncontrolling Interest
Temporary Equity, Dividends to Redeemable Noncontrolling Interest
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]