Represents the percentage of share awards and restricted units that generally vest over an annual period.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

As of the balance sheet date, unrecognized cost of estimated forfeitures of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

No definition available.

+ Details

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- Definition

Percentage of shares to be vested proportionately over the next 36 months of the vesting commencement date.

+ References

No definition available.

+ Details

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Namespace Prefix:	stx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the maximum percentage of target share-based awards that may vest.

+ References

No definition available.

+ Details

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- Definition

This element represents the minimum percentage of target share-based awards that may vest.

+ References

No definition available.

+ Details

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- Definition

This element represents the number of share-based payment equity instruments (excluding stock options) targeted to vest.

+ References

No definition available.

+ Details

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- Definition

Description of the remaining period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

No definition available.

+ Details

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- Definition

Represents the maximum number of shares to be issued under the Stock Purchase Plan per offering period.

+ References

No definition available.

+ Details

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- Definition

This element represents the period (in years) for which performance is measured against the performance criteria.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Share Reserve Ratio

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- References

No definition available.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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No definition available.

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Balance Type:	na
Period Type:	duration

- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- 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.

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- Definition

Net number of non-option equity instruments granted to participants.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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Period Type:	instant

- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
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- Definition

Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan.

+ References

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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

- Definition

Percentage of vesting of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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Balance Type:	credit
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- Details

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- Details

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- Details

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- Details

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Share-based Compensation (Narrative) (Details)		12 Months Ended
Share-based Compensation (Narrative) (Details)	Nov. 04, 2011 shares	Jun. 30, 2017 USD ($) mo $ / shares shares	Jul. 01, 2016 USD ($) $ / shares shares	Jul. 03, 2015 USD ($) shares	Oct. 19, 2016 $ / shares shares	Apr. 22, 2015 USD ($)	Oct. 24, 2014 $ / shares shares	Oct. 26, 2011 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Par value (usd per share) \| $ / shares		$ 0.00001	$ 0.00001
Share-based compensation		$ 137,000,000	$ 120,000,000	$ 137,000,000
Tax-Deferred Savings Plan
Percentage match of employee contribution under 401(k) plan (as a percent)		50.00%
Maximum contribution match by the employer as a percentage of employee compensation (as a percent)		6.00%
Maximum amount of contribution per employee made by the employer per year		$ 4,500
Matching contributions		18,000,000	19,000,000	18,000,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised		29,000,000	44,000,000	92,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		15,000,000	18,000,000	10,000,000
Unrecognized compensation cost		$ 25,000,000
Number of shares, granted \| shares		2,300,000
Unrecognized compensation cost of estimated forfeitures		$ 1,000,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		2 years 6 months
STX 2012 EIP [Member] \| Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares					7,500,000.0		25,000,000	27,000,000
Par value (usd per share) \| $ / shares					$ 0.0001		$ 0.0001	$ 0.0001
Share Reserves ratio, granted		2.5
Number of shares available for grant \| shares		30,800,000.0
STX 2004 SCP [Member] \| Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares deregistered from the plan \| shares	11,000,000
Equity Incentive Plan Dot Hill 2009 [Member] [Domain] \| Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares		2,000,000
Share Reserves ratio, granted		1.5
Number of shares available for grant \| shares		1,000,000.0
ESPP [Member] \| Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares		50,000,000
Per share weighted average price of shares purchased \| $ / shares		$ 26.68
Number of shares available for grant \| shares		4,800,000.0
Offering period for Stock Purchase Plan (in months)		6 months
Maximum number of shares per offering period \| shares		1,500,000
Employee purchase price, percentage of fair market value of ordinary shares		85.00%
Aggregate intrinsic value of options exercised		$ 24,000,000	$ 12,000,000	$ 15,000,000
Unrecognized compensation cost		$ 1,700,000
Number of shares, granted \| shares		2,000,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		1 month
Full Value Share Awards [Member] \| Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Full Value Share Awards [Member] \| Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Full Value Share Awards [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options to be vested proportionately after first Anniversary of vesting commencement date (as a percent)		75.00%
Remaining award vesting period (in months) \| mo		36
TSR/ROIC [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units targeted to vest (in shares) \| shares		600,000	400,000	300,000
Performance period (in years)		3 years
Minimum percentage of targeted stock units to vest (as a percent)		0.00%
Maximum percentage of targeted stock units to vest (as a percent)		200.00%
TSR/ROIC [Member] \| Performance Shares [Member] \| Senior Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted \| shares		200,000	200,000
AEPS [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage for share awards and restricted units (as a percent)		25.00%
Award vesting period		7 years
AEPS [Member] \| Performance Shares [Member] \| Senior Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted \| shares				400,000
AEPS [Member] \| Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		7 years
Nonvested Shares [Member] \| Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 135,000,000
Unrecognized compensation cost of estimated forfeitures		$ 8,000,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		2 years 7 months 6 days
Aggregate fair value of nonvested shares vested		$ 73,000,000	$ 102,000,000	$ 156,000,000
Performance Awards Market Condition [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 36,000,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		3 years 3 months 14 days
April 2015 Share Repurchase Program [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount						$ 2,500,000,000
Share-based Compensation Award, Tranche One [Member] \| Full Value Share Awards [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options to be vested on first anniversary of vesting commencement date (as a percent)		25.00%