v2.4.0.8

Shareholders' Equity (Details 2) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 30, 2012	Sep. 27, 2013
Repurchases of equity securities
Preferred Stock Minimum Number of Series		1
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 3,200,000,000
Repurchases of Equity Securities, Number of Shares Repurchased
Number of Shares Repurchased, During the Period		4
Value of Stock Repurchased and Retired During Period		182,000,000
Stock Repurchased Period To Date Shares		4
Stock Repurchased Period to Date Value		182,000,000
stx_April 2012ShareRepurchaseProgram [Member]
Repurchases of equity securities
Stock repurchase program, additional authorization	$ 2,500,000,000	$ 2,500,000,000

X

- Definition

The minimum number of series of preferred shares, should preferred shares be issued.

+ References

No definition available.

+ Details

Name:	stx_PreferredStockMinimumNumberOfSeries
Namespace Prefix:	stx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

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

X

- Definition

This element represents the number of shares that have been repurchased to date.

+ References

No definition available.

+ Details

Name:	stx_StockRepurchasedPeriodToDateShares
Namespace Prefix:	stx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents the approximate dollar value of shares that have been repurchased to date under plans or programs.

+ References

No definition available.

+ Details

Name:	stx_StockRepurchasedPeriodToDateValue
Namespace Prefix:	stx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value was charged against retained earnings.

+ References

No definition available.

+ Details

Name:	stx_ValueOfStockRepurchasedAndRetiredDuringPeriod
Namespace Prefix:	stx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration