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