XML 73 R60.htm IDEA: XBRL DOCUMENT v3.7.0.1

Debt (Narrative) (Details) - USD ($)									12 Months Ended
	Feb. 03, 2017	May 14, 2015	Dec. 02, 2014	May 28, 2014	Nov. 05, 2013	May 22, 2013	May 18, 2011	May 13, 2010	Jun. 30, 2017	Jul. 01, 2016	Jul. 03, 2015	Jan. 15, 2015	Apr. 30, 2013
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity												$ 700,000,000
Sub-limit for issuance of letters of credit under revolving credit facility													$ 75,000,000
Line of Credit Facility Letters of Credit Outstanding									$ 0
Gain (Loss) on Extinguishment of Debt									$ (7,000,000)	$ 3,000,000	$ (74,000,000)
Senior Notes 3.75 Percent due November 2018 [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 800,000,000
Stated interest rate (as a percent)					3.75%				3.75%	3.75%
Redemption price as percentage of principal amount (percent)					100.00%
Basis spread on variable rate (basis points)					50.00%
Debt Instrument, Repurchase Amount									$ 90,000,000
Senior Notes 6.875 Percent due May 2020 [Member]
Debt Instrument [Line Items]
Aggregate principal amount								$ 600,000,000
Stated interest rate (as a percent)								6.875%
Redemption price as percentage of principal amount (percent)								100.00%
Basis spread on variable rate (basis points)								50.00%
Debt Instrument, Applicable Premium Percentage of Principal Amount								1.00%
Senior Notes 7.00 Percent due November 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount							$ 600,000,000
Stated interest rate (as a percent)							7.00%			7.00%
Redemption price as percentage of principal amount (percent)							100.00%
Basis spread on variable rate (basis points)							50.00%
Debt Instrument, Repurchase Amount										$ 1,000,000	93,000,000
Extinguishment of debt, principal amount									(158,000,000)
Debt Instrument, Applicable Premium Percentage of Principal Amount							1.00%
Debt Instrument, Redemption with Net Proceeds from Equity Offerings as Percentage of Principal							35.00%
Debt Instrument, Future Redemption Price as Percentage of Original Principal							107.00%
Senior Notes 4.25 Percent Due March 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 750,000,000
Stated interest rate (as a percent)	4.25%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Senior Notes 4.75 Percent Due June 2023 [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,000,000,000
Stated interest rate (as a percent)						4.75%
Redemption price as percentage of principal amount (percent)						100.00%
Basis spread on variable rate (basis points)						50.00%
Debt Instrument, Repurchase Amount									39,000,000	$ 10,000,000
Gain (Loss) on Repurchase of Debt Instrument									$ 0
Senior Notes 4.875 Percent Due March 2024 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 500,000,000
Stated interest rate (as a percent)	4.875%								4.875%	4.875%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount				$ 1,000,000,000
Stated interest rate (as a percent)				4.75%					4.75%	4.75%
Redemption price as percentage of principal amount (percent)				100.00%
Basis spread on variable rate (basis points)				50.00%
Debt Instrument, Repurchase Amount									$ 20,000,000	$ 5,000,000
Senior Note 4.875 percent Due June 2027 [Domain]
Debt Instrument [Line Items]
Aggregate principal amount		$ 700,000,000.0
Stated interest rate (as a percent)		4.875%							4.875%	4.875%
Redemption price as percentage of principal amount (percent)		100.00%
Basis spread on variable rate (basis points)		40.00%
Debt Instrument, Repurchase Amount									$ 4,000,000
Senior note 5.75 percent due December 2034 [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 500,000,000.0
Stated interest rate (as a percent)			5.75%						5.75%	5.75%
Redemption price as percentage of principal amount (percent)			100.00%
Basis spread on variable rate (basis points)			50.00%
Debt Instrument, Repurchase Amount										$ 10,000,000
Other nonoperating income, net [Member] | Senior Notes 3.75 Percent due November 2018 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument									$ 3,000,000
Other nonoperating income, net [Member] | Senior Notes 6.875 Percent due May 2020 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument									26,000,000
Other nonoperating income, net [Member] | Senior Notes 7.00 Percent due November 2021 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument										13,000,000	$ 0
Gain (Loss) on Extinguishment of Debt									(5,000,000)
Other nonoperating income, net [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument										0
Other nonoperating income, net [Member] | Senior Notes 4.875 Percent Due March 2024 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument									0
Other nonoperating income, net [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument									$ (1,000,000)	0
Other nonoperating income, net [Member] | Senior note 5.75 percent due December 2034 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Repurchase of Debt Instrument										$ (3,000,000)
Treasury Rate [Member] | Senior Notes 4.25 Percent Due March 2022 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (basis points)	0.40%
Treasury Rate [Member] | Senior Notes 4.875 Percent Due March 2024 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (basis points)	0.045%

X

- Definition

The "applicable premium" will be equal to the greater of (1) this percentage of the principal amount of the notes, or (2) the excess, if any, of (a) the present value of the redemption price on a certain specified date plus interest payments due through the specified date, discounted at the applicable Treasury rate as of the redemption date plus basis points at a specified amount over (b) the principal amount of such note.

+ References

No definition available.

+ Details

Name:	stx_DebtInstrumentApplicablePremiumPercentageOfPrincipalAmount
Namespace Prefix:	stx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of principal amount at which the entity may redeem the debt instrument.

+ References

No definition available.

+ Details

Name:	stx_DebtInstrumentFutureRedemptionPriceAsPercentageOfOriginalPrincipal
Namespace Prefix:	stx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the maximum percentage of the aggregate principal amount of the debt instruments that the entity may redeem with net cash proceeds of certain equity offerings.

+ References

No definition available.

+ Details

Name:	stx_DebtInstrumentRedemptionWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipal
Namespace Prefix:	stx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maximum amount available for issuances of letters of credit under the revolving credit facility.

+ References

No definition available.

+ Details

Name:	stx_LineOfCreditFacilityAvailableForIssuancesOfLettersOfCreditMaximum
Namespace Prefix:	stx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Ratio of redemption price of long-term debt to be redeemed before applicable premiums and unpaid interest, if any.

+ References

No definition available.

+ Details

Name:	stx_RedemptionPriceAsPercentageOfPrincipalAmount
Namespace Prefix:	stx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

+ References

No definition available.

+ Details

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

X

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

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

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes3.75PercentdueNovember2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes6875PercentDueMay2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes7.00PercentdueNovember2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes4.25PercentDueMarch2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes4.75PercentDueJune2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes4.875PercentDueMarch2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNotes4.75PercentDueJanuary2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_SeniorNote4.875percentDueJune2027Domain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=stx_Seniornote5.75percentdueDecember2034Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: