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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative - Revenue Recognition (Details) | 12 Months Ended
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Dec. 29, 2024
Product |
Revenue from External Customer [Line Items] |
Payment period from invoice | 30 days

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- Definition Revenue From Contract With Customer, Payment Term + References No definition available. + Details
Name: | ilmn_RevenueFromContractWithCustomerPaymentTerm
Namespace Prefix: | ilmn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |