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v3.21.4

Guarantees Guarantees (Narrative) (Details) | 3 Months Ended
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Dec. 31, 2021
Minimum |
Schedule of Fiscal Years [Line Items] |
Product warranty period term | 1 year
Maximum |
Schedule of Fiscal Years [Line Items] |
Product warranty period term | 5 years

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- Definition Represents the product warranty term. + References No definition available. + Details
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Namespace Prefix: | stx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Schedule of Fiscal Years [Table] + References No definition available. + Details
Name: | stx_ScheduleofFiscalYearsLineItems
Namespace Prefix: | stx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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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: |