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Guarantees Guarantees (Narrative) (Details) $ in Millions	3 Months Ended
	Dec. 29, 2023 USD ($)
Schedule of Fiscal Years [Line Items]
intellectual property indemnification obligations	$ 0
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

X

- Definition

intellectual property indemnification obligations

+ References

No definition available.

+ Details

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Namespace Prefix:	stx_
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X

- Definition

Represents the product warranty term.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

[Line Items] for Schedule of Fiscal Years [Table]

+ References

No definition available.

+ Details

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Namespace Prefix:	stx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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