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SUPPLEMENTAL BALANCE SHEET DETAILS - Warranties (Details) | 9 Months Ended
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Sep. 28, 2025
Instruments |
Product Warranty Liability [Line Items] |
Warranty period | 1 year
Consumables | Minimum |
Product Warranty Liability [Line Items] |
Warranty period | 6 months
Consumables | Maximum |
Product Warranty Liability [Line Items] |
Warranty period | 12 months

X
- Definition Describes the approximate term of the product warranty. + References No definition available. + Details
Name: | ilmn_StandardProductWarrantyDescriptionTerm
Namespace Prefix: | ilmn_
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_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |