Seagate Technology (STX) 10-Q 3 Nov 14 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Oct. 03, 2014	Oct. 27, 2014
Document And Entity Information	'	'
Entity Registrant Name	'Seagate Technology plc	'
Entity Central Index Key	'0001137789	'
Document Type	'10-Q	'
Document Period End Date	3-Oct-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--07-03	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	327,238,884
Document Fiscal Year Focus	'2015	'
Document Fiscal Period Focus	'Q1	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$2,190	$2,634
Short-term investments	11	20
Restricted cash and investments	4	4
Accounts receivable, net	1,909	1,729
Inventories	1,071	985
Deferred income taxes	125	126
Other current assets	273	279
Total current assets	5,583	5,777
Property, equipment and leasehold improvements, net	2,156	2,136
Goodwill	873	537
Other intangible assets, net	468	359
Deferred income taxes	499	499
Other assets, net	186	184
Total Assets	9,765	9,492
Current liabilities:	'	'
Accounts payable	1,740	1,549
Accrued employee compensation	245	296
Accrued warranty	145	148
Accrued expenses	466	405
Total current liabilities	2,596	2,398
Long-term accrued warranty	128	125
Long-term accrued income taxes	87	90
Other non-current liabilities	199	127
Long-term debt	3,809	3,920
Total Liabilities	6,819	6,660
Seagate Technology plc Shareholders' Equity:	'	'
Ordinary shares and additional paid-in capital	5,580	5,511
Accumulated other comprehensive loss	-15	-2
Accumulated deficit	-2,619	-2,677
Total Seagate Technology plc Shareholders' Equity	2,946	2,832
Noncontrolling interest	0	'
Total Equity	2,946	2,832
Total Liabilities and Equity	$9,765	$9,492

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
Income Statement [Abstract]	'	'
Revenue	$3,785	$3,489
Cost of revenue	2,734	2,514
Product development	342	294
Marketing and administrative	216	181
Amortization of intangibles	31	20
Restructuring and other, net	6	2
Total operating expenses	3,329	3,011
Income from operations	456	478
Interest income	1	5
Interest expense	-54	-44
Other, net	-11	1
Other expense, net	-64	-38
Income before income taxes	392	440
Provision for income taxes	11	13
Net income	381	427
Less: Net income attributable to noncontrolling interest	0	0
Net income attributable to Seagate Technology plc	$381	$427
Net income per share attributable to Seagate Technology plc ordinary shareholders:	'	'
Basic (in dollars per share)	$1.17	$1.20
Diluted (in dollars per share)	$1.13	$1.16
Number of shares used in per share calculations:	'	'
Basic (in shares)	327	357
Diluted (in shares)	337	368
Cash dividends declared per Seagate Technology plc ordinary share	$0.43	$0.38

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014		Sep. 27, 2013
Statement of Comprehensive Income [Abstract]	'		'
Net income	$381		$427
Cash flow hedges	'		'
Change in net unrealized gain (loss) on cash flow hedges	-3		1
Less: reclassification for amounts included in net income	0		0
Net change	-3		1
Marketable securities	'		'
Change in net unrealized gain (loss) on marketable securities	0		1
Less: reclassification for amounts included in net income	0	[1]	0
Net change	0		1
Post-retirement plans	'		'
Change in unrealized gain (loss) on post-retirement plans	0		0
Less: reclassification for amounts included in net income	0		0
Net change	0		0
Foreign currency translation adjustments	'		'
Foreign currency translation adjustments	-10		5
Total other comprehensive income (loss), net of tax	-13		7
Comprehensive income	368		434
Less: Comprehensive income attributable to noncontrolling interest	0		0
Comprehensive income attributable to Seagate Technology plc	$368		$434
[1]	The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
OPERATING ACTIVITIES	'	'
Net income	$381	$427
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	218	228
Share-based compensation	42	27
Deferred income taxes	2	-1
Gain on sale of property and equipment	0	-2
Loss on repurchase of debt	14	0
Other non-cash operating activities, net	-2	4
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-179	49
Inventories	-49	-17
Accounts payable	183	47
Accrued employee compensation	-51	-115
Accrued expenses, income taxes and warranty	29	37
Vendor non-trade receivables	21	0
Other assets and liabilities	-7	-2
Net cash provided by operating activities	602	682
INVESTING ACTIVITIES	'	'
Acquisition of property, equipment and leasehold improvements	-172	-161
Purchases of short-term investments	-5	-87
Sales of short-term investments	0	49
Maturities of short-term investments	14	32
Cash used in acquisition of business	450	0
Other investing activities, net	6	19
Net cash used in investing activities	-619	-186
FINANCING ACTIVITIES	'	'
Repurchase of long-term debt	-124	0
Repurchases of ordinary shares	-183	-182
Dividends to shareholders	-140	-135
Proceeds from issuance of ordinary shares under employee stock plans	39	39
Other financing activities, net	-12	-4
Net cash used in financing activities	-420	-282
Effect of foreign currency exchange rate changes on cash and cash equivalents	-7	2
(Decrease) increase in cash and cash equivalents	-444	216
Cash and cash equivalents at the beginning of the period	2,634	1,708
Cash and cash equivalents at the end of the period	$2,190	$1,924

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)	Total	Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Parent [Member]	Noncontrolling Interest [Member]
In Millions, unless otherwise specified
Total Seagate Technology plc Shareholders' Equity, Starting Balance at Jun. 27, 2014	$2,832	$0	$5,511	($2)	($2,677)	$2,832	'
Noncontrolling Interest Equity, Starting Balance at Jun. 27, 2014	'	'	'	'	'	'	0
Total Equity, Beginning balance at Jun. 27, 2014	2,832	'	'	'	'	'	'
Starting Balance (in shares) at Jun. 27, 2014	'	327	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net income	381	'	'	'	381	381	0
Other comprehensive income	-13	'	'	-13	'	-13	'
Issuance of ordinary shares under employee stock plans	39	'	39	'	'	39	'
Issuance of ordinary shares under employee stock plans (in shares)	'	3	'	'	'	'	'
Repurchases of ordinary shares	-183	'	'	'	-183	-183	'
Repurchases of ordinary shares (in shares)	-3	-3	'	'	'	'	'
Dividends to shareholders	-140	'	'	'	-140	-140	'
Share-based compensation	42	'	42	'	'	42	'
Others	12	'	-12	'	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	'	12	'
Total Seagate Technology plc Shareholders' Equity, Ending Balance at Oct. 03, 2014	2,946	0	5,580	-15	-2,619	2,946	'
Noncontrolling Interest Equity, Ending Balance at Oct. 03, 2014	0	'	'	'	'	'	0
Total Equity, Ending balance at Oct. 03, 2014	$2,946	'	'	'	'	'	'
Ending Balance (in shares) at Oct. 03, 2014	'	327	'	'	'	'	'

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Oct. 03, 2014
Accounting Policies [Abstract]	'
Basis of Presentation and Summary of Significant Accounting Policies	'
	Basis of Presentation and Summary of Significant Accounting Policies
	Organization
	The Company is a leading provider of electronic data storage solutions. Its principal products are hard disk drives, commonly referred to as disk drives, hard drives or HDDs. Hard disk drives are devices that store digitally encoded data on rapidly rotating disks with magnetic surfaces. Disk drives are used as the primary medium for storing electronic data. In addition to HDDs, we produce a broad range of electronic data storage products including solid state hybrid drives (“SSHD”) and solid state drives (“SSD”).
	The Company's products are designed for enterprise servers and storage systems in mission critical and nearline applications; client compute applications, where its products are designed primarily for desktop and mobile computing; and client non-compute applications, where its products are designed for a wide variety of end user devices such as digital video recorders (“DVRs”), personal data backup systems, portable external storage systems and digital media systems.
	The Company continues to make strategic investments in order to expand its storage solutions, enter new market adjacencies, and expand our technical expertise. As a result of recent acquisitions, the Company's product and solution portfolio for the enterprise data storage industry includes storage enclosures, integrated application platforms and high performance computing ("HPC") data storage solutions. The Company's storage subsystems support a range of high-speed interconnect technologies to meet demanding cost and performance specifications. The Company's modular subsystem architecture allows it to support many segments within the networked storage market by enabling different specifications of storage subsystem designs to be created from a standard set of interlocking technology modules.
	In addition to manufacturing and selling data storage products, the Company provides data storage services for small to medium-sized businesses, including online backup, data protection and recovery solutions.
	Basis of Presentation and Consolidation
	The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances.
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the Company’s condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. The methods, estimates and judgments the Company uses in applying its most critical accounting policies have a significant impact on the results the Company reports in its condensed consolidated financial statements. The condensed consolidated financial statements reflect, in the opinion of management, all material adjustments necessary to present fairly the condensed consolidated financial position, results of operations, comprehensive income, cash flows and shareholders’ equity for the periods presented. Such adjustments are of a normal and recurring nature.
	The Company’s Consolidated Financial Statements for the fiscal year ended June 27, 2014, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 7, 2014. The Company believes that the disclosures included in the unaudited condensed consolidated financial statements, when read in conjunction with its Consolidated Financial Statements as of June 27, 2014, and the notes thereto, are adequate to make the information presented not misleading.
	The results of operations for the three months ended October 3, 2014, are not necessarily indicative of the results of operations to be expected for any subsequent interim period in the Company’s fiscal year ending July 3, 2015. The Company operates and reports financial results on a fiscal year of 52 or 53 weeks ending on the Friday closest to June 30. The three months ended October 3, 2014 and September 27, 2013 consisted of 14 weeks and 13 weeks, respectively.  Fiscal year 2015 will be comprised of 53 weeks and will end on July 3, 2015.
	Summary of Significant Accounting Policies
	There have been no significant changes in our significant accounting policies. Please refer to Note 1 of “Financial Statements and Supplementary Data” contained in Part II, Item 8 of the Company’s Annual Report on Form 10-K for the fiscal year ended June 27, 2014, as filed with the SEC on August 7, 2014 for a discussion of the Company’s other significant accounting policies.
	Recently Issued Accounting Pronouncements
	In May 2014, The FASB issued ASU 2014-09 (ASC Topic 606), Revenue from Contracts with Customers. The ASU outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It also requires entities to disclose both quantitative and qualitative information that enable financial statements users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The ASU will be effective for the Company's first quarter of fiscal year 2018. The Company is in the process of assessing the impact, if any, of ASU 2014-09 on its consolidated financial statements.

Balance_Sheet_Information

Balance Sheet Information	3 Months Ended
	Oct. 03, 2014
Disclosure Text Block Supplement [Abstract]	'
Balance Sheet Information	'
	Balance Sheet Information
	Investments
	The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of October 3, 2014:
	(Dollars in millions)	Amortized			Unrealized			Fair
		Cost			Gain/(Loss)			Value
	Available-for-sale securities:
	Money market funds	$	558		$	—		$	558
	Commercial paper	1,077			—			1,077
	Corporate bonds	11			—			11
	Certificates of deposit	260			—			260
		$	1,906		$	—		$	1,906
	Included in Cash and cash equivalents							$	1,891
	Included in Short-term investments							11
	Included in Restricted cash and investments							4
	Total							$	1,906
	As of October 3, 2014, the Company’s Restricted cash and investments consisted of $4 million in cash and investments held as collateral at banks for various performance obligations.
	As of October 3, 2014, the Company had no available-for-sale securities that had been in a continuous unrealized loss position for a period greater than 12 months. The Company determined no available-for-sale securities were other-than-temporarily impaired as of October 3, 2014.
	The fair value and amortized cost of the Company’s investments classified as available-for-sale at October 3, 2014, by remaining contractual maturity were as follows:
	(Dollars in millions)	Amortized			Fair
		Cost			Value
	Due in less than 1 year	$	1,900		$	1,900
	Due in 1 to 5 years	6			6
	Thereafter	—			—
	Total	$	1,906		$	1,906
	The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of June 27, 2014:
	(Dollars in millions)	Amortized			Unrealized			Fair
		Cost			Gain/(Loss)			Value
	Available-for-sale securities:
	Money market funds	$	793		$	—		$	793
	Commercial paper	1,261			—			1,261
	Corporate bonds	6			—			6
	Certificates of deposit	273			—			273
	Total	$	2,333		$	—		$	2,333
	Included in Cash and cash equivalents							$	2,309
	Included in Short-term investments							20
	Included in Restricted cash and investments							4
	Total							$	2,333
	As of June 27, 2014, the Company had no available-for-sale securities that had been in a continuous unrealized loss position for a period greater than 12 months. The Company determined no available-for-sale securities were other-than-temporarily impaired as of June 27, 2014.
	Inventories
	The following table provides details of the inventory balance sheet item:
	(Dollars in millions)	October 3,			June 27,
		2014			2014
	Raw materials and components	$	313		$	324
	Work-in-process	314			267
	Finished goods	444			394
		$	1,071		$	985
	Property, Equipment and Leasehold Improvements, net
	The components of property, equipment and leasehold improvements, net, were as follows:
	(Dollars in millions)	October 3,			June 27,
		2014			2014
	Property, equipment and leasehold improvements	$	9,135		$	8,979
	Accumulated depreciation and amortization	(6,979		)	(6,843		)
		$	2,156		$	2,136
	Accumulated Other Comprehensive Income (Loss) (“AOCI”)
	The components of AOCI, net of tax, were as follows:
	(Dollars in millions)	Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Marketable Securities (a)			Unrealized Gains (Losses) on post-retirements			Foreign currency translation adjustments			Total
	Balance at June 27, 2014	$	(1	)	$	—		$	(10	)	$	9		$	(2	)
	Other comprehensive income (loss) before reclassifications	(3		)	—			—			(10		)	(13		)
	Amounts reclassified from AOCI	—			—			—			—			—
	Other comprehensive income (loss)	(3		)	—			—			(10		)	(13		)
	Balance at October 3, 2014	$	(4	)	$	—		$	(10	)	$	(1	)	$	(15	)
	Balance at June 28, 2013	$	—		$	(3	)	$	(11	)	$	1		$	(13	)
	Other comprehensive income (loss) before reclassifications	1			1			—			5			7
Amounts reclassified from AOCI	—			—			—			—			—
Other comprehensive income (loss)	1			1			—			5			7
Balance at September 27, 2013	$	1		$	(2	)	$	(11	)	$	6		$	(6	)
___________________________________________
(a)The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt

Debt	3 Months Ended
	Oct. 03, 2014
Debt Disclosure [Abstract]	'
Debt	'
	Debt
	Short-Term Borrowings
	On January 18, 2011, the Company and its subsidiary, Seagate HDD Cayman, entered into a Credit Agreement which provided a $350 million senior secured revolving credit facility (the “Revolving Credit Facility”). On April 30, 2013, the Company and Seagate HDD Cayman entered into the Second Amendment to the Credit Agreement which increased the commitments available under the Revolving Credit Facility from $350 million to $500 million. The loans made under the Credit Agreement will bear interest at a rate of LIBOR plus a variable margin that will be determined based on the corporate credit rating of the Company. The Company and certain of its material subsidiaries fully and unconditionally guarantee the Revolving Credit Facility. The Revolving Credit Facility matures in April 2018, and is available for cash borrowings and for the issuance of letters of credit up to a sub-limit of $75 million. As of October 3, 2014, no borrowings had been drawn under the Revolving Credit Facility or had been utilized for letters of credit.
	Long-Term Debt
	$600 million Aggregate Principal Amount of 6.8% Senior Notes due October 2016 (the “2016 Notes”). The interest on the 2016 Notes is payable semi-annually on April 1 and October 1 of each year. The issuer under the 2016 Notes is Seagate HDD Cayman, and the obligations under the 2016 Notes are unconditionally guaranteed by certain of the Company’s significant subsidiaries. During the September 2014 quarter, the Company repurchased $4 million aggregate principal amount of its 2016 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. The Company recorded a loss on the repurchase of approximately of $0.5 million, which is included in Other, net in the Company's Condensed Consolidated Statement of Operations.
	$800 million Aggregate Principal Amount of 3.75% Senior Notes due November 2018 (the “2018 Notes”).  The interest on the 2018 Notes is payable semi-annually on May 15 and November 15 of each year. The issuer under the 2018 Notes is Seagate HDD Cayman and the obligations under the 2018 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	$600 million Aggregate Principal Amount of 6.875% Senior Notes due May 2020 (the “2020 Notes”). The interest on the 2020 Notes is payable semi-annually on May 1 and November 1 of each year. The issuer under the 2020 Notes is Seagate HDD Cayman, and the obligations under the 2020 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company. During the September 2014 quarter, the Company repurchased $28 million aggregate principal amount of its 2020 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. The Company recorded a loss on the repurchase of approximately of $2 million, which is included in Other, net in the Company's Condensed Consolidated Statement of Operations.
	$600 million Aggregate Principal Amount of 7.00% Senior Notes due November 2021 (the “2021 Notes”). The interest on the 2021 Notes is payable semi-annually on January 1 and July 1 of each year. The issuer under the 2021 Notes is Seagate HDD Cayman and the obligations under the 2021 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company. During the September 2014 quarter, the Company repurchased $79 million aggregate principal amount of its 2021 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. The Company recorded a loss on the repurchase of approximately of $11 million, which is included in Other, net in the Company's Condensed Consolidated Statement of Operations.
	$1 billion Aggregate Principal Amount of 4.75% Senior Notes due June 2023 (the “2023 Notes”). The interest on the 2023 Notes is payable semi-annually on June 1 and December 1 of each year. The issuer under the 2023 Notes is Seagate HDD Cayman and the obligations under the 2023 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	$1 billion Aggregate Principal Amount of 4.75% Senior Notes due January 2025 (the “2025 Notes”). The interest on the Notes is payable in cash semiannually on January 1 and July 1 of each year, commencing on January 1, 2015. The issuer under the 2025 Notes is Seagate HDD Cayman and the obligations under the 2025 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	At October 3, 2014, future principal payments on long-term debt were as follows (in millions):
	Fiscal Year	Amount
	Remainder of 2015	$	—
	2016	—
	2017	331
	2018	—
	2019	800
	Thereafter	2,678
		$	3,809

Income_Taxes

Income Taxes	3 Months Ended
	Oct. 03, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The Company's income tax provision of $11 million in the three months ended October 3, 2014 included approximately $2 million net discrete tax benefits primarily associated with the release of tax reserves associated with the expiration of certain statutes of limitation.
	The Company's income tax provision recorded for the three months ended October 3, 2014 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes, primarily due to the net effect of (i) tax benefits related to non-U.S. earnings generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland and (ii) a decrease in valuation allowance for certain U.S. deferred tax assets.
	During the three months ended October 3, 2014, the Company’s unrecognized tax benefits excluding interest and penalties decreased by approximately $1 million to $114 million. The unrecognized tax benefits that, if recognized, would impact the effective tax rate was $114 million at October 3, 2014, subject to certain future valuation allowance reversals. During the 12 months beginning October 4, 2014, the Company expects that its unrecognized tax benefits could be reduced anywhere from $3 million to $50 million as a result of audit settlements and the expiration of certain statutes of limitation.
	The Company is subject to taxation in many jurisdictions globally and is required to file U.S. federal, U.S. state and non-U.S. income tax returns. In June 2014, the Company received the Revenue Agent’s Report and Notices of Proposed Adjustments for its U.S. federal income tax returns for fiscal years 2008, 2009 and 2010. The Company’s China subsidiaries are under examination by the Chinese tax administration for years 2004 through 2012. These examinations may result in proposed adjustments to the income taxes as filed during these periods. The Company believes that it has adequately provided for these matters, but there is a reasonable possibility that an adverse outcome of these examinations could have a material effect on the Company’s financial results. In this case, the Company would consider pursuing all possible remedies available, including appeals, judicial review and competent authority.
	The Company's income tax provision of $13 million in the three months ended September 27, 2013 included approximately $3 million of net discrete tax expense primarily associated with enacted tax legislation.
	The Company's income tax provision recorded for the three months ended September 27, 2013 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes, primarily due to the net effect of (i) tax benefits related to non-U.S. earnings generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland and (ii) a decrease in valuation allowance for certain U.S. deferred tax assets.

Acquisitions

Acquisitions	3 Months Ended
	Oct. 03, 2014
Business Combinations [Abstract]	'
Business Combination Disclosure	'
	Acquisitions
	LSI's Flash Business
	On September 2, 2014, the Company completed the acquisition of certain assets and liabilities of LSI Corporation's ("LSI") Accelerated Solutions Division and Flash Components Division (collectively, the "Flash Business") from Avago Technologies Limited for $450 million in cash. The transaction is expected to strengthen Seagate's strategy to deliver a full suite of storage solutions, providing Seagate with established enterprise PCIe flash and SSD controller capabilities to deliver solutions for the growing flash storage market.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Inventories	$	37
	Property, plant and equipment	22
	Intangible assets	141
	Other assets	6
	Goodwill	337
	Total assets	543
	Liabilities	(93		)
	Total liabilities	(93		)
	Total	$	450
	The following table shows the fair value of the separately identifiable intangible assets at the time of acquisition and the weighted-average period over which intangible assets within each category will be amortized:
	(Dollars in millions)	Fair Value			Weighted-
					Average
					Amortization
					Period
	Existing technology	$	84		3.5 years
	Customer relationships	40			3.8 years
	Trade names	17			4.5 years
	Total acquired identifiable intangible assets	$	141
	The goodwill recognized is primarily attributable to the benefits the Company expects to derive from enhanced market opportunities, and is not deductible for income tax purposes.
	The Company incurred approximately $1 million of expenses related to the acquisition of LSI's Flash Business during the September 2014 quarter, which are included within Marketing and administrative expense on the Consolidated Statement of Operations.
	The amounts of revenue and earnings of LSI's Flash Business included in the Company's Consolidated Statement of Operations from the acquisition date are not significant.
	Xyratex Ltd
	On March 31, 2014, the Company acquired all of the outstanding shares of Xyratex Ltd (“Xyratex”), a leading provider of data storage technology. The Company paid $13.25 per share, or approximately $376 million in cash for the acquisition. The acquisition of Xyratex further strengthens the Company’s vertically integrated supply and manufacturing chain for disk drives and provides access to important capital requirements, as well as expands the Company’s storage solutions portfolio.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Cash and cash equivalents	$	91
	Accounts receivable, net	67
	Inventories	111
	Other current and non-current assets	28
	Property, plant and equipment	55
	Intangible assets	80
	Goodwill	60
	Total assets	492
	Accounts payable and accrued expenses	(116		)
	Total liabilities	(116		)
	Total	$	376
	The accounts receivable of $67 million are net of an immaterial allowance at March 31, 2014.
	The following table shows the fair value of the separately identifiable intangible assets at the time of acquisition and the weighted-average period over which intangible assets within each category will be amortized:
	(Dollars in millions)	Fair Value			Weighted-
					Average
					Amortization
					Period
	Existing technology	$	23		5.5 years
	Customer relationships	18			3.9 years
	Total amortizable intangible assets acquired	41			4.8 years
	In-process research and development	39
	Total acquired identifiable intangible assets	$	80
	The goodwill recognized is primarily attributable to the synergies expected to arise from the acquisition, and is not deductible for income tax purposes.
	The Company incurred a total of $10 million of expenses related to the acquisition of Xyratex in fiscal year 2014, which are included within Marketing and administrative expense on the Consolidated Statement of Operations.
	The amounts of revenue and earnings of Xyratex included in the Company's Consolidated Statement of Operations from the acquisition date are not significant.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	3 Months Ended
	Oct. 03, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill
	The changes in the carrying amount of goodwill for the three months ended October 3, 2014, are as follows:
	(Dollars in millions)	Amount
	Balance at June 27, 2014	$	537
	Goodwill acquired	337
	Foreign currency translation effect	(1		)
	Balance at October 3, 2014	$	873
	Other Intangible Assets
	Other intangible assets consist primarily of existing technology, customer relationships, in-process research and development and trade names acquired in business combinations. With the exception of in-process research and development, acquired intangibles are amortized on a straight-line basis over the respective estimated useful lives of the assets. Amortization is charged to Operating expenses in the Condensed Consolidated Statements of Operations. In-process research and development has been determined to have an indefinite useful life and is not amortized, but instead tested for impairment annually or more frequently if events or changes in circumstance indicate that the asset might be impaired. If the carrying amount of in-process research and development exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. There were no impairment charges recognized for in-process research and development. Upon completion of the in-process research and development, the related assets will be accounted for as existing technology and will be amortized over their useful life.
	The carrying value of other intangible assets subject to amortization as of October 3, 2014, is set forth in the following table:
	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	152	$	(27	)	$	125	3.2 years
	Customer relationships		488		(215		)	273		3.1 years
	Trade names		27		(2		)	25		3.9 years
	Other intangible assets		7		(1		)	6		3.8 years
	Total amortizable other intangible assets		$	674	$	(245	)	$	429	3.2 years
	The carrying value of In-process research and development not subject to amortization was $39 million on October 3, 2014.
	The carrying value of other intangible assets subject to amortization as of June 27, 2014 is set forth in the following table:
	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	68	$	(18	)	$	50	2.9 years
	Customer relationships		450		(192		)	258		3.3 years
	Trade names		10		(1		)	9		3.1 years
	Other intangible assets		4		(1		)	3		4.4 years
	Total amortizable other intangible assets		$	532	$	(212	)	$	320	3.2 years
	The carrying value of In-process research and development not subject to amortization was $39 million on June 27, 2014.
	For the three months ended October 3, 2014, amortization expense of other intangible assets was $34 million. For the three months ended September 27, 2013, amortization expense of other intangible assets was $37 million. As of October 3, 2014, expected amortization expense for other intangible assets for each of the next five fiscal years and thereafter is as follows:
	(Dollars in millions)	Amount
	Remainder of 2015	$	115
	2016	132
	2017	113
	2018	52
	2019	15
	Thereafter	2
		$	429

Derivative_Financial_Instrumen

Derivative Financial Instruments

3 Months Ended

Oct. 03, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

Derivative Instruments and Hedging Activities Disclosure

'

Derivative Financial Instruments

The Company is exposed to market risks due to the volatility of interest rates, foreign currency exchange rates, and bond markets. The Company enters into foreign currency forward exchange contracts to manage the foreign currency exchange rate risk on forecasted expenses denominated in foreign currencies and to mitigate the remeasurement risk of certain foreign currency denominated liabilities. The Company’s accounting policies for these instruments are based on whether the instruments are classified as designated or non-designated hedging instruments. The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The changes in the fair values of the effective portions of designated cash flow hedges are recorded in Accumulated other comprehensive loss until the hedged item is recognized in earnings. Derivatives that are not designated as hedging instruments and the ineffective portions of cash flow hedges are adjusted to fair value through earnings. The amount of net unrealized losses on cash flow hedges was $4 million and $1 million as of October 3, 2014 and June 27, 2014, respectively.

The Company dedesignates its cash flow hedges when the forecasted hedged transactions are realized or it is probable the forecasted hedged transactions will not occur in the initially identified time period. At such time, the associated gains and losses deferred in Accumulated other comprehensive loss are reclassified immediately into earnings and any subsequent changes in the fair value of such derivative instruments are immediately reflected in earnings. The Company did not recognize any net gains or losses related to the loss of hedge designation on discontinued cash flow hedges during the three months ended October 3, 2014. As of October 3, 2014, the Company’s existing foreign currency forward exchange contracts mature within 12 months. The deferred amount currently recorded in Accumulated other comprehensive income expected to be recognized into earnings over the next 12 months is immaterial.

The following tables show the total notional value of the Company’s outstanding foreign currency forward exchange contracts as of October 3, 2014 and June 27, 2014:

As of October 3, 2014

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

169

Singapore Dollars

142

16

Chinese Renminbi

77

—

British Pound Sterling

12

—

Malaysian Ringgit

4

—

$

235

$

185

As of June 27, 2014

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

143

British Pound Sterling

25

—

Malaysian Ringgit

9

—

$

34

$

143

The Company is subject to equity market risks due to changes in the fair value of the notional investments selected by its employees as part of its Non-qualified Deferred Compensation Plan—the Seagate Deferred Compensation Plan (the “SDCP”). In the quarter ended December 27, 2013, the Company entered into a Total Return Swap (“TRS”) in order to manage the equity market risks associated with the SDCP liabilities. The Company pays a floating rate, based on LIBOR plus an interest rate spread, on the notional amount of the TRS. The TRS is designed to substantially offset changes in the SDCP liability due to changes in the value of the investment options made by employees. As of October 3, 2014, the notional investments underlying the TRS amounted to $91 million. The contract term of the TRS is approximately one year and is settled on a monthly basis, therefore limiting counterparty performance risk. The Company did not designate the TRS as a hedge. Rather, the Company records all changes in the fair value of the TRS to earnings to offset the market value changes of the SDCP liabilities.

The following tables show the Company’s derivative instruments measured at fair value as reflected in the Condensed Consolidated Balance Sheet as of October 3, 2014 and June 27, 2014:

As of October 3, 2014

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

1

Accrued expenses

$

(4

)

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

—

Accrued expenses

$

(4

)

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

1

$

(8

)

As of June 27, 2014

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

3

Accrued expenses

$

—

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

2

Accrued expenses

$

—

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

5

$

—

The following tables show the effect of the Company’s derivative instruments on the Condensed Consolidated Statement of Comprehensive Income and the Condensed Consolidated Statement of Operations for the three months ended October 3, 2014:

(Dollars in millions)

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

Recognized

from

Reclassified

Income on

Recognized in

in OCI on

Accumulated

from

Derivatives

Income

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

(Effective

Income

OCI into

Portion and

Portion and

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

from

Excluded from

Portion)

Effectiveness

Effectiveness

Testing)

Testing) (a)

Foreign currency forward exchange contracts

$

(3

)

Cost of revenue

$

—

Cost of revenue

$

1

Derivatives Not Designated as Hedging Instruments

Location of

Amount of

Gain or (Loss)

Gain or (Loss)

Recognized in

Recognized in Income

Income on

on Derivative

Derivative

Foreign currency forward exchange contracts

Other, net

$

(4

)

Total return swap

Operating expenses

$

(3

)

___________________________________________

(a)

The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationships and $1 million related to the amount excluded from the assessment of hedge effectiveness for the three months ended October 3, 2014.

The following tables show the effect of the Company’s derivative instruments on the Condensed Consolidated Statement of Comprehensive Income and the Condensed Consolidated Statement of Operations for the three months ended September 27, 2013:

(Dollars in millions)

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

Recognized

from

Reclassified

Income on

Recognized in

in OCI on

Accumulated

from

Derivatives

Income

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

(Effective

Income

OCI into

Portion and

Portion and

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

from

Excluded from

Portion)

Effectiveness

Effectiveness

Testing)

Testing) (a)

Foreign currency forward exchange contracts

$

1

Cost of revenue

$

—

Cost of revenue

$

—

Derivatives Not Designated as Hedging Instruments

Location of Gain or

Amount of Gain or

(Loss) Recognized in

(Loss) Recognized in

Income on Derivatives

Income on Derivatives

Foreign currency forward exchange contracts

Other, net

$

1

___________________________________________

(a)

The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three months ended September 27, 2013.

Fair_Value

Fair Value	3 Months Ended
	Oct. 03, 2014
Fair Value Disclosures [Abstract]	'
Fair Value	'
	Fair Value
	Measurement of Fair Value
	Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability.
	Fair Value Hierarchy
	A fair value hierarchy is based on whether the market participant assumptions used in determining fair value are obtained from independent sources (observable inputs) or reflects the Company’s own assumptions of market participant valuation (unobservable inputs). A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels of inputs that may be used to measure fair value:
	Level 1 — Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities;
	Level 2 — Quoted prices for identical assets and liabilities in markets that are inactive; quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly; or
	Level 3 — Prices or valuations that require inputs that are both unobservable and significant to the fair value measurement.
	The Company considers an active market to be one in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis, and views an inactive market as one in which there are few transactions for the asset or liability, the prices are not current, or price quotations vary substantially either over time or among market makers. Where appropriate the Company’s or the counterparty’s non-performance risk is considered in determining the fair values of liabilities and assets, respectively.
	Items Measured at Fair Value on a Recurring Basis
	The following tables present the Company’s assets and liabilities, by financial instrument type and balance sheet line item, that are measured at fair value on a recurring basis, excluding accrued interest components, as of October 3, 2014:
		Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant			Significant			Total
		Prices in			Other			Unobservable			Balance
		Active			Observable			Inputs
		Markets for			Inputs			(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets:
	Money market funds	$	558		$	—		$	—		$	558
	Commercial paper	—			1,077			—			1,077
	Certificates of deposit	—			256			—			256
	Corporate bonds	—			11			—			11
	Total cash equivalents and short-term investments	558			1,344			—			1,902
	Restricted cash and investments:
	Other securities	—			4			—			4
	Derivative assets	—			1			—			1
	Total assets	$	558		$	1,349		$	—		$	1,907
	Liabilities:
	Derivative liabilities	$	—		$	8		$	—		$	8
	Total liabilities	$	—		$	8		$	—		$	8
		Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant			Significant			Total
		Prices in			Other			Unobservable			Balance
		Active			Observable			Inputs
		Markets for			Inputs			(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets:
	Cash and cash equivalents	$	558		$	1,333		$	—		$	1,891
	Short-term investments	—			11			—			11
	Restricted cash and investments	—			4			—			4
	Other current assets	—			1			—			1
	Total assets	$	558		$	1,349		$	—		$	1,907
	Liabilities:
	Accrued expenses	$	—		$	8		$	—		$	8
	Total liabilities	$	—		$	8		$	—		$	8
	The following tables present the Company’s assets and liabilities, by financial instrument type and balance sheet line item, that are measured at fair value on a recurring basis, excluding accrued interest components, as of June 27, 2014:
		Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant			Significant			Total
		Prices in			Other			Unobservable			Balance
		Active			Observable			Inputs
		Markets for			Inputs			(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets:
	Money market funds	$	793		$	—		$	—		$	793
	Commercial paper	—			1,261			—			1,261
	Certificates of deposit	—			269			—			269
	Corporate bonds	—			6			—			6
Total cash equivalents and short-term investments	793			1,536			—			2,329
Restricted cash and investments:
Other securities	—			4			—			4
Derivative assets	—			5			—			5
Total assets	$	793		$	1,545		$	—		$	2,338
Liabilities:
Derivative liabilities	$	—		$	—		$	—		$	—
Total liabilities	$	—		$	—		$	—		$	—
	Fair Value Measurements at Reporting Date Using
(Dollars in millions)	Quoted			Significant			Significant			Total
	Prices in			Other			Unobservable			Balance
	Active			Observable			Inputs
	Markets for			Inputs			(Level 3)
	Identical			(Level 2)
	Instruments
	(Level 1)
Assets:
Cash and cash equivalents	$	793		$	1,516		$	—		$	2,309
Short-term investments	—			20			—			20
Restricted cash and investments	—			4			—			4
Other current assets	—			5			—			5
Total assets	$	793		$	1,545		$	—		$	2,338
Liabilities:
Accrued expenses	$	—		$	—		$	—		$	—
Total liabilities	$	—		$	—		$	—		$	—
The Company classifies items in Level 1 if the financial assets consist of securities for which quoted prices are available in an active market.
The Company classifies items in Level 2 if the financial asset or liability is valued using observable inputs. The Company uses observable inputs including quoted prices in active markets for similar assets or liabilities. Level 2 assets include: agency bonds, corporate bonds, commercial paper, municipal bonds and U.S. Treasuries. These debt investments are priced using observable inputs and valuation models which vary by asset class. The Company uses a pricing service to assist in determining the fair values of all of its cash equivalents and short-term investments. For the cash equivalents and short-term investments in the Company’s portfolio, multiple pricing sources are generally available. The pricing service uses inputs from multiple industry standard data providers or other third party sources and various methodologies, such as weighting and models, to determine the appropriate price at the measurement date. The Company corroborates the prices obtained from the pricing service against other independent sources and, as of October 3, 2014, has not found it necessary to make any adjustments to the prices obtained. The Company’s derivative financial instruments are also classified within Level 2. The Company’s derivative financial instruments consist of foreign currency forward exchange contracts and the TRS. The Company recognizes derivative financial instruments in its condensed consolidated financial statements at fair value. The Company determines the fair value of these instruments by considering the estimated amount it would pay or receive to terminate these agreements at the reporting date.
The Company enters into certain strategic investments for the achievement of business and strategic objectives. Strategic investments in equity securities where the Company does not have the ability to exercise significant influence over the investees, are included in Other assets, net in the Condensed Consolidated Balance Sheets, are recorded at cost and are periodically analyzed to determine whether or not there are indicators of impairment. The carrying value of the Company’s strategic investments at October 3, 2014 and June 27, 2014 totaled $52 million and $46 million, respectively, and consisted primarily of privately held equity securities without a readily determinable fair value.
Other Fair Value Disclosures
The Company’s debt is carried at amortized cost. The fair value of the Company’s debt is derived using the closing price as of the date of valuation, which takes into account the yield curve, interest rates, and other observable inputs. Accordingly, these fair value measurements are categorized as Level 2. The following table presents the fair value and amortized cost of the Company’s debt in order of maturity:
		October 3, 2014						June 27, 2014
(Dollars in millions)		Carrying			Estimated			Carrying			Estimated
		Amount			Fair Value			Amount			Fair Value
6.8% Senior Notes due October 2016		$	331		$	364		$	335		$	374
3.75% Senior Notes due November 2018		800			817			800			820
6.875% Senior Notes due May 2020		506			537			534			578
7.00% Senior Notes due November 2021		172			191			251			284
4.75% Senior Notes due June 2023		1,000			1,027			1,000			1,009
4.75% Senior Notes due January 2025		1,000			1,012			1,000			995
Long-term debt		$	3,809		$	3,948		$	3,920		$	4,060

Shareholders_Equity

Shareholders' Equity	3 Months Ended
	Oct. 03, 2014
Equity [Abstract]	'
Shareholders' Equity	'
	Equity
	Share Capital
	The Company’s authorized share capital is $13,500 and consists of 1,250,000,000 ordinary shares, par value $0.00001, of which 327,176,198 shares were outstanding as of October 3, 2014, and 100,000,000 preferred shares, par value $0.00001, of which none were issued or outstanding as of October 3, 2014.
	Ordinary shares—Holders of ordinary shares are entitled to receive dividends when and as declared by the Company’s board of directors (the “Board of Directors”). Upon any liquidation, dissolution, or winding up of the Company, after required payments are made to holders of preferred shares, any remaining assets of the Company will be distributed ratably to holders of the preferred and ordinary shares. Holders of shares are entitled to one vote per share on all matters upon which the ordinary shares are entitled to vote, including the election of directors.
	Preferred shares—The Company may issue preferred shares in one or more series, up to the authorized amount, without shareholder approval. The Board of Directors is authorized to establish from time to time the number of shares to be included in each series, and to fix the rights, preferences and privileges of the shares of each wholly unissued series and any of its qualifications, limitations or restrictions. The Board of Directors can also increase or decrease the number of shares of a series, but not below the number of shares of that series then outstanding, without any further vote or action by the shareholders.
	The Board of Directors may authorize the issuance of preferred shares with voting or conversion rights that could harm the voting power or other rights of the holders of the ordinary shares. The issuance of preferred shares, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in control of the Company and might harm the market price of its ordinary shares and the voting and other rights of the holders of ordinary shares.
	Repurchases of Equity Securities
	On July 24, 2013, the Board of Directors authorized the Company to repurchase an additional $2.5 billion of its outstanding ordinary shares.
	All repurchases are effected as redemptions in accordance with the Company’s Articles of Association.
	As of October 3, 2014, $1.3 billion remained available for repurchase under the existing repurchase authorization limit.
	The following table sets forth information with respect to repurchases of the Company’s shares during the three months ended October 3, 2014:
	(In millions)	Number of	Dollar Value
		Shares	of Shares
		Repurchased	Repurchased
	Repurchased during the three months ended October 3, 2014	3	$	183
	Fiscal year repurchased through October 3, 2014	3	$	183

Compensation

Compensation	3 Months Ended
	Oct. 03, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Compensation	'
	Compensation
	The Company recorded approximately $42 million and $27 million of stock-based compensation expense during the three months ended October 3, 2014 and September 27, 2013, respectively.

Guarantees

Guarantees	3 Months Ended
	Oct. 03, 2014
Guarantees [Abstract]	'
Financial Guarantees and Warranties	'
	Guarantees
	Indemnifications to Officers and Directors
	On May 4, 2009, Seagate Technology, an exempted company incorporated with limited liability under the laws of the Cayman Islands (“Seagate-Cayman”), then the parent company, entered into a new form of indemnification agreement (the “Revised Indemnification Agreement”) with its officers and directors of Seagate-Cayman and its subsidiaries (each, an “Indemnitee”). The Revised Indemnification Agreement provides indemnification in addition to any of Indemnitee's indemnification rights under Seagate-Cayman's Articles of Association, applicable law or otherwise, and indemnifies an Indemnitee for certain expenses (including attorneys' fees), judgments, fines and settlement amounts actually and reasonably incurred by him or her in any action or proceeding, including any action by or in the right of Seagate-Cayman or any of its subsidiaries, arising out of his or her service as a director, officer, employee or agent of Seagate-Cayman or any of its subsidiaries or of any other entity to which he or she provides services at Seagate-Caymans's request. However, an Indemnitee shall not be indemnified under the Revised Indemnification Agreement for (i) any fraud or dishonesty in the performance of Indemnitee's duty to Seagate-Cayman or the applicable subsidiary of Seagate-Cayman or (ii) Indemnitee's conscious, intentional or willful failure to act honestly, lawfully and in good faith with a view to the best interests of Seagate-Cayman or the applicable subsidiary of Seagate-Cayman. In addition, the Revised Indemnification Agreement provides that Seagate-Cayman will advance expenses incurred by an Indemnitee in connection with enforcement of the Revised Indemnification Agreement or with the investigation, settlement or appeal of any action or proceeding against him or her as to which he or she could be indemnified.
	On July 3, 2010 pursuant to a corporate reorganization, the common shareholders of Seagate-Cayman became ordinary shareholders of Seagate Technology plc (the "Company") and Seagate-Cayman became a wholly owned subsidiary of the Company, as described more fully in the Current Report on Form 8-K filed by the Company on July 6, 2010 (the “Redomestication”). On July 27, 2010, in connection with the Redomestication, the Company, as sole shareholder of Seagate-Cayman, approved a form of deed of indemnity (the “Deed of Indemnity”), which provides for the indemnification by Seagate-Cayman of any director, officer, employee or agent of the Company, Seagate-Cayman or any subsidiary of the Company (each, a “Deed Indemnitee”), in addition to any of a Deed Indemnitee's indemnification rights under the Company's Articles of Association, applicable law or otherwise, with a similar scope to the Revised Indemnification Agreement. Seagate-Cayman entered into the Deed of Indemnity with certain Deed Indemnitees effective as of July 3, 2010 and continues to enter into the Deed of Indemnity with additional Deed Indemnitees from time to time.
	The nature of these indemnification obligations prevents the Company from making a reasonable estimate of the maximum potential amount it could be required to pay on behalf of its officers and directors. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification obligations.
	Intellectual Property Indemnification Obligations
	The Company has entered into agreements with customers and suppliers that include limited intellectual property indemnification obligations that are customary in the industry. These guarantees generally require the Company to compensate the other party for certain damages and costs incurred as a result of third party intellectual property claims arising from these transactions. The nature of the intellectual property indemnification obligations prevents the Company from making a reasonable estimate of the maximum potential amount it could be required to pay to its customers and suppliers. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification obligations.
	Product Warranty
	The Company estimates probable product warranty costs at the time revenue is recognized. The Company generally warrants its products for a period of 1 to 5 years. The Company uses estimated repair or replacement costs and uses statistical modeling to estimate product return rates in order to determine its warranty obligation. Changes in the Company’s product warranty liability during the three months ended October 3, 2014 and September 27, 2013 were as follows:
		For the Three Months Ended
	(Dollars in millions)	October 3,			September 27,
		2014			2013
	Balance, beginning of period	$	273		$	320
	Warranties issued	40			48
	Repairs and replacements	(54		)	(58		)
	Changes in liability for pre-existing warranties, including expirations	6			8
	Warranty liability assumed from business acquisitions	8			—
	Balance, end of period	$	273		$	318

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Oct. 03, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic earnings per share is computed by dividing income available to shareholders by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing income available to shareholders by the weighted-average number of shares outstanding during the period and the number of additional shares that would have been outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include outstanding options, unvested restricted share units and shares to be purchased under the ESPP. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share by application of the treasury stock method. Under the treasury stock method, an increase in fair market value of the Company’s share price can result in a greater dilutive effect from potentially dilutive securities. The following table sets forth the computation of basic and diluted net income per share attributable to the shareholders of Seagate Technology plc:
		For the Three Months Ended
	(In millions, except per share data)	October 3,		September 27,
		2014		2013
	Numerator:
	Net income attributable to Seagate Technology plc	$	381	$	427
	Number of shares used in per share calculations:
	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	327		357
	Weighted-average effect of dilutive securities:
	Employee equity award plans	10		11
	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	337		368
	Net income per share attributable to Seagate Technology plc shareholders:
	Basic	$	1.17	$	1.2
	Diluted	$	1.13	$	1.16
	The anti-dilutive shares related to employee equity award plans that were excluded from the computation of diluted net income per share attributable to Seagate Technology plc were immaterial for the three months ended October 3, 2014 and September 27, 2013.

Legal_Environmental_and_Other_

Legal, Environmental and Other Contingencies	3 Months Ended
	Oct. 03, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Legal, Environmental and Other Contingencies	'
	Legal, Environmental and Other Contingencies
	The Company assesses the probability of an unfavorable outcome of all its material litigation, claims, or assessments to determine whether a liability had been incurred and whether it is probable that one or more future events will occur confirming the fact of the loss. In the event that an unfavorable outcome is determined to be probable and the amount of the loss can be reasonably estimated, the Company establishes an accrual for the litigation, claim or assessment. In addition, in the event an unfavorable outcome is determined to be less than probable, but reasonably possible, the Company will disclose an estimate of the possible loss or range of such loss; however, when a reasonable estimate cannot be made, the Company will provide disclosure to that effect. Litigation is inherently uncertain and may result in adverse rulings or decisions. Additionally, the Company may enter into settlements or be subject to judgments that may, individually or in the aggregate, have a material adverse effect on its results of operations. Accordingly, actual results could differ materially.
	Intellectual Property Litigation
	Convolve, Inc. (“Convolve”) and Massachusetts Institute of Technology (“MIT”) v. Seagate Technology LLC, et al.—On July 13, 2000, Convolve and MIT filed suit against Compaq Computer Corporation and Seagate Technology LLC in the U.S. District Court for the Southern District of New York, alleging infringement of U.S. Patent Nos. 4,916,635 (the “'635 patent”) and U.S. Patent No. 5,638,267 (the “'267 patent”), misappropriation of trade secrets, breach of contract, and other claims. In the complaint, the plaintiffs requested injunctive relief, $800 million in compensatory damages and unspecified punitive damages, including for willful infringement. On January 16, 2002, Convolve filed an amended complaint, alleging defendants infringe US Patent No. 6,314,473 (the “'473 patent”). The district court ruled in 2010 that the '267 patent was out of the case.
	On August 16, 2011, the district court granted in part and denied in part the Company's motion for summary judgment. On July 1, 2013, the U.S. Court of Appeals for the Federal Circuit: 1) affirmed the district court's summary judgment rulings that Seagate did not misappropriate any of the alleged trade secrets and that the asserted claims of the '635 patent are invalid; 2) reversed and vacated the district court's summary judgment of non-infringement with respect to the '473 patent; and 3) remanded the case for further proceedings on the '473 patent. On July 11, 2014, the district court granted its ruling on the Company’s summary judgment motion regarding Convolve’s only remaining cause of action, which alleged infringement of the ‘473 patent. The court entered judgment in favor of the Company on July 14, 2014. Convolve filed a notice of appeal on August 13, 2014. In view of the rulings made by the district court and the Court of Appeals and the uncertainty regarding the amount of damages, if any, that could be awarded Convolve in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	Alexander Shukh v. Seagate Technology—On February 12, 2010, Alexander Shukh filed a complaint against the Company in the U.S. District Court for the District of Minnesota, alleging, among other things, employment discrimination based on his Belarusian national origin and wrongful failure to name him as an inventor on several patents and patent applications. Mr. Shukh's employment was terminated as part of a company-wide reduction in force in fiscal year 2009. He seeks damages in excess of $75 million. The Company believes the claims are without merit and intends to vigorously defend this case. On March 31, 2014, the district court granted Seagate’s summary judgment motion and entered judgment in favor of Seagate. Mr. Shukh filed a notice of appeal on April 7, 2014. In view of the uncertainty regarding the amount of damages, if any, that could be awarded in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	LEAP Co., Ltd. v. Seagate Singapore International Headquarters Pte. Ltd. and Nippon Seagate Inc.—On July 4, 2012, LEAP Co., Ltd. filed a lawsuit in the Tokyo District Court of Japan against Seagate Singapore International Headquarters Pte. Ltd., Nippon Seagate Inc. and Buffalo Inc. alleging wrongful termination of purchase agreements and other claims, and seeking approximately $38 million in damages. A date for the start of trial has not yet been scheduled. The Company believes the claims are without merit and intends to vigorously defend this case. In view of the uncertainty regarding the amount of damages, if any, that could be awarded in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	Realtek Semiconductor Corporation ITC Investigation re Certain Integrated Circuit Chips and Products Containing the Same-On September 19, 2012, Realtek Semiconductor Corporation filed a complaint with the International Trade Commission (“ITC”) seeking an investigation pursuant to Section 337 of the Tariff Act of 1930, as amended (“Section 337”). The complaint names LSI Corporation and Seagate Technology as respondents and alleges infringement of U.S. patents relating to integrated circuit chips that include bond pad structures. Realtek seeks an order to exclude entry of infringing integrated circuit chips and products containing the infringing integrated circuit chips into the U.S. and a cease and desist order. The ITC initiated an investigation on October 18, 2012. On March 21, 2014, the Administrative Law Judge (“ALJ”) issued an Initial Determination in favor of Seagate and LSI. On July 21, 2014, the Commission gave notice that it had determined to affirm in part, reverse in part and vacate in part the ALJ’s Initial Determination; the Commission found that no violation of Section 337 by Seagate or LSI has occurred based on findings that certain of the patent claims at issue were invalid, and that Realtek failed to show the existence of an industry in the U.S. that exploits the patent. Realtek filed a notice of appeal on September 18, 2014. In view of the uncertainty regarding the possible outcome of this case and the nature of the relief sought, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible loss or range of loss, or other possible adverse result, if any, that may be incurred with respect to this matter.
	Enova Technology Corporation v. Seagate Technology (US) Holdings, Inc., et al.-On June 5, 2013, Enova Technology Corporation filed a complaint against Seagate Technology (US) Holdings, Inc. and Seagate Technology LLC in the U.S. District Court for the District of Delaware alleging infringement of U.S. Patent No. 7,136,995, “Cryptographic Device,” and U.S. Patent No. 7,900,057, “Cryptographic Serial ATA Apparatus and Method.” The complaint seeks unspecified compensatory damages, enhanced damages, injunctive relief, attorneys' fees, and other relief. The trial is scheduled to begin July 11, 2016. The Company believes the claims are without merit and intends to vigorously defend this case. In view of the uncertainty regarding the amount of damages, if any, that could be awarded in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	Environmental Matters
	The Company's operations are subject to U.S. and foreign laws and regulations relating to the protection of the environment, including those governing discharges of pollutants into the air and water, the management and disposal of hazardous substances and wastes and the cleanup of contaminated sites. Some of the Company's operations require environmental permits and controls to prevent and reduce air and water pollution, and these permits are subject to modification, renewal and revocation by issuing authorities.
	The Company has established environmental management systems and continually updates its environmental policies and standard operating procedures for its operations worldwide. The Company believes that its operations are in material compliance with applicable environmental laws, regulations and permits. The Company budgets for operating and capital costs on an ongoing basis to comply with environmental laws. If additional or more stringent requirements are imposed on the Company in the future, it could incur additional operating costs and capital expenditures.
	Some environmental laws, such as the Comprehensive Environmental Response Compensation and Liability Act of 1980 (as amended, the “Superfund” law) and its state equivalents, can impose liability for the cost of cleanup of contaminated sites upon any of the current or former site owners or operators or upon parties who sent waste to these sites, regardless of whether the owner or operator owned the site at the time of the release of hazardous substances or the lawfulness of the original disposal activity. The Company has been identified as a potentially responsible party at several sites. At each of these sites, the Company has an assigned portion of the financial liability based on the type and amount of hazardous substances disposed of by each party at the site and the number of financially viable parties. The Company has fulfilled its responsibilities at some of these sites and remains involved in only a few at this time.
	While the Company's ultimate costs in connection with these sites is difficult to predict with complete accuracy, based on its current estimates of cleanup costs and its expected allocation of these costs, the Company does not expect costs in connection with these sites to be material.
	The Company may be subject to various state, federal and international laws and regulations governing the environment, including those restricting the presence of certain substances in electronic products. For example, the European Union (“EU”) enacted the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment, which prohibits the use of certain substances, including lead, in certain products, including disk drives and server storage products, put on the market after July 1, 2006. Similar legislation has been or may be enacted in other jurisdictions, including in the United States, Canada, Mexico, Taiwan, China, Japan and others. The European Union REACH Directive (Registration, Evaluation, Authorization, and Restriction of Chemicals, EC 1907/2006) also restricts substances of very high concern (“SVHCs”) in products. If the Company or its suppliers fails to comply with the substance restrictions, recycle requirements or other environmental requirements as they are enacted worldwide, it could have a materially adverse effect on the Company's business.
	Other Matters
	The Company is involved in a number of other judicial and administrative proceedings incidental to its business, and the Company may be involved in various legal proceedings arising in the normal course of its business in the future. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on its financial position or results of operations.

Subsequent_Events

Subsequent Events	3 Months Ended
	Oct. 03, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On October 8, 2014, the Minnesota Supreme Court ruled that the arbitration award in favor of the Company in its case against Western Digital for the misappropriation of the Company trade secrets should be confirmed. In the arbitration award, issued on January 23, 2012, the arbitrator determined that Western Digital and its former employee had misappropriated the Company trade secrets. The arbitrator awarded the Company $525 million in compensatory damages and, after adding interest, issued a final award of approximately $630 million. Interest on the final award has been accruing at 10%.  On October 14, 2014, the Company received a partial payment from Western Digital in the amount of approximately $773 million.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Oct. 03, 2014
Accounting Policies [Abstract]	'
Consolidation, Policy	'
	Basis of Presentation and Consolidation
	The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances.
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the Company’s condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. The methods, estimates and judgments the Company uses in applying its most critical accounting policies have a significant impact on the results the Company reports in its condensed consolidated financial statements. The condensed consolidated financial statements reflect, in the opinion of management, all material adjustments necessary to present fairly the condensed consolidated financial position, results of operations, comprehensive income, cash flows and shareholders’ equity for the periods presented. Such adjustments are of a normal and recurring nature.
	The Company’s Consolidated Financial Statements for the fiscal year ended June 27, 2014, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 7, 2014. The Company believes that the disclosures included in the unaudited condensed consolidated financial statements, when read in conjunction with its Consolidated Financial Statements as of June 27, 2014, and the notes thereto, are adequate to make the information presented not misleading.
New Accounting Pronouncements, Policy	'
	In May 2014, The FASB issued ASU 2014-09 (ASC Topic 606), Revenue from Contracts with Customers. The ASU outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It also requires entities to disclose both quantitative and qualitative information that enable financial statements users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The ASU will be effective for the Company's first quarter of fiscal year 2018. The Company is in the process of assessing the impact, if any, of ASU 2014-09 on its consolidated financial statements.

Balance_Sheet_Information_Tabl

Balance Sheet Information (Tables)	3 Months Ended
	Oct. 03, 2014																Sep. 27, 2013
Disclosure Text Block Supplement [Abstract]	'																'
Summary of fair value and amortized cost of investments, by major type	'																'
	(Dollars in millions)	Amortized			Unrealized			Fair									(Dollars in millions)	Amortized		Unrealized		Fair
		Cost			Gain/(Loss)			Value										Cost		Gain/(Loss)		Value
	Available-for-sale securities:																Available-for-sale securities:
	Money market funds	$	558		$	—		$	558								Money market funds	$	793	$	—	$	793
	Commercial paper	1,077			—			1,077									Commercial paper	1,261		—		1,261
	Corporate bonds	11			—			11									Corporate bonds	6		—		6
	Certificates of deposit	260			—			260									Certificates of deposit	273		—		273
		$	1,906		$	—		$	1,906								Total	$	2,333	$	—	$	2,333
	Included in Cash and cash equivalents							$	1,891								Included in Cash and cash equivalents					$	2,309
	Included in Short-term investments							11									Included in Short-term investments					20
	Included in Restricted cash and investments							4									Included in Restricted cash and investments					4
	Total							$	1,906								Total					$	2,333
Fair value and amortized cost of available-for-sale securities by contractual maturity	'																'
	(Dollars in millions)	Amortized			Fair
		Cost			Value
	Due in less than 1 year	$	1,900		$	1,900
	Due in 1 to 5 years	6			6
	Thereafter	—			—
	Total	$	1,906		$	1,906
Inventories	'																'
	(Dollars in millions)	October 3,			June 27,
		2014			2014
	Raw materials and components	$	313		$	324
	Work-in-process	314			267
	Finished goods	444			394
		$	1,071		$	985
Other Current Assets	'																'
Property, Equipment and Leasehold Improvements, net	'																'
	(Dollars in millions)	October 3,			June 27,
		2014			2014
	Property, equipment and leasehold improvements	$	9,135		$	8,979
	Accumulated depreciation and amortization	(6,979		)	(6,843		)
		$	2,156		$	2,136
Schedule of accumulated other comprehensive income (loss)	'																'
	(Dollars in millions)	Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Marketable Securities (a)			Unrealized Gains (Losses) on post-retirements			Foreign currency translation adjustments			Total
	Balance at June 27, 2014	$	(1	)	$	—		$	(10	)	$	9		$	(2	)
	Other comprehensive income (loss) before reclassifications	(3		)	—			—			(10		)	(13		)
	Amounts reclassified from AOCI	—			—			—			—			—
	Other comprehensive income (loss)	(3		)	—			—			(10		)	(13		)
	Balance at October 3, 2014	$	(4	)	$	—		$	(10	)	$	(1	)	$	(15	)
	Balance at June 28, 2013	$	—		$	(3	)	$	(11	)	$	1		$	(13	)
	Other comprehensive income (loss) before reclassifications	1			1			—			5			7
	Amounts reclassified from AOCI	—			—			—			—			—
	Other comprehensive income (loss)	1			1			—			5			7
	Balance at September 27, 2013	$	1		$	(2	)	$	(11	)	$	6		$	(6	)
	___________________________________________
	(a)The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt_Tables

Debt (Tables)	3 Months Ended
	Oct. 03, 2014
Debt Disclosure [Abstract]	'
Future principal payments on long-term debt	'
	Fiscal Year	Amount
	Remainder of 2015	$	—
	2016	—
	2017	331
	2018	—
	2019	800
	Thereafter	2,678
		$	3,809

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Oct. 03, 2014
Business Acquisition [Line Items]	'
Fair value of assets acquired and liabilities assumed	'
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Inventories	$	37
	Property, plant and equipment	22
	Intangible assets	141
	Other assets	6
	Goodwill	337
	Total assets	543
	Liabilities	(93		)
	Total liabilities	(93		)
	Total	$	450
Xyratex Ltd [Member]	'
Business Acquisition [Line Items]	'
Fair value of assets acquired and liabilities assumed	'
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Cash and cash equivalents	$	91
	Accounts receivable, net	67
	Inventories	111
	Other current and non-current assets	28
	Property, plant and equipment	55
	Intangible assets	80
	Goodwill	60
	Total assets	492
	Accounts payable and accrued expenses	(116		)
	Total liabilities	(116		)
	Total	$	376

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Oct. 03, 2014										Sep. 27, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'										'
Changes in the carrying amount of goodwill	'										'
	(Dollars in millions)	Amount
	Balance at June 27, 2014	$	537
	Goodwill acquired	337
	Foreign currency translation effect	(1		)
	Balance at October 3, 2014	$	873
Carrying value of intangible assets	'										'
	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average	(Dollars in millions)	Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life		Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	152	$	(27	)	$	125	3.2 years	Existing technology	$	68	$	(18	)	$	50	2.9 years
	Customer relationships		488		(215		)	273		3.1 years	Customer relationships	450		(192		)	258		3.3 years
	Trade names		27		(2		)	25		3.9 years	Trade names	10		(1		)	9		3.1 years
	Other intangible assets		7		(1		)	6		3.8 years	Other intangible assets	4		(1		)	3		4.4 years
	Total amortizable other intangible assets		$	674	$	(245	)	$	429	3.2 years	Total amortizable other intangible assets	$	532	$	(212	)	$	320	3.2 years
Expected amortization expense for acquisition-related intangible assets	'										'
	(Dollars in millions)	Amount
	Remainder of 2015	$	115
	2016	132
	2017	113
	2018	52
	2019	15
	Thereafter	2
		$	429

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

3 Months Ended

Oct. 03, 2014

Sep. 27, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

'

Schedule of notional value of outstanding foreign currency forward exchange contracts

'

'

As of October 3, 2014

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

169

Singapore Dollars

142

16

Chinese Renminbi

77

—

British Pound Sterling

12

—

Malaysian Ringgit

4

—

$

235

$

185

As of June 27, 2014

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

143

British Pound Sterling

25

—

Malaysian Ringgit

9

—

$

34

$

143

Schedule of gross fair value of derivative instruments

'

'

As of October 3, 2014

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

1

Accrued expenses

$

(4

)

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

—

Accrued expenses

$

(4

)

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

1

$

(8

)

As of June 27, 2014

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

3

Accrued expenses

$

—

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

2

Accrued expenses

$

—

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

5

$

—

Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations

'

'

(Dollars in millions)

(Dollars in millions)

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

Recognized

from

Reclassified

Income on

Recognized in

Recognized

from

Reclassified

Income on

Recognized in

in OCI on

Accumulated

from

Derivatives

Income

in OCI on

Accumulated

from

Derivatives

Income

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

(Effective

Income

OCI into

Portion and

Portion and

(Effective

Income

OCI into

Portion and

Portion and

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

from

Excluded from

Portion)

(Effective

from

Excluded from

Portion)

Effectiveness

Effectiveness

Portion)

Effectiveness

Effectiveness

Testing)

Testing) (a)

Testing)

Testing) (a)

Foreign currency forward exchange contracts

$

(3

)

Cost of revenue

$

—

Cost of revenue

$

1

Foreign currency forward exchange contracts

$

1

Cost of revenue

$

—

Cost of revenue

$

—

Derivatives Not Designated as Hedging Instruments

Location of

Amount of

Derivatives Not Designated as Hedging Instruments

Location of Gain or

Amount of Gain or

Gain or (Loss)

Gain or (Loss)

(Loss) Recognized in

(Loss) Recognized in

Recognized in

Recognized in Income

Income on Derivatives

Income on Derivatives

Income on

on Derivative

Foreign currency forward exchange contracts

Other, net

$

1

Derivative

Foreign currency forward exchange contracts

Other, net

$

(4

)

___________________________________________

Total return swap

Operating expenses

$

(3

)

___________________________________________

(a)

The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three months ended September 27, 2013.

(a)

The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationships and $1 million related to the amount excluded from the assessment of hedge effectiveness for the three months ended October 3, 2014.

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Oct. 03, 2014									Sep. 27, 2013
Fair Value Disclosures [Abstract]	'									'
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	'									'
		Fair Value Measurements at Reporting Date Using									Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted		Significant		Significant		Total		(Dollars in millions)	Quoted			Significant			Significant			Total
		Prices in		Other		Unobservable		Balance			Prices in			Other			Unobservable			Balance
		Active		Observable		Inputs					Active			Observable			Inputs
		Markets for		Inputs		(Level 3)					Markets for			Inputs			(Level 3)
		Identical		(Level 2)							Identical			(Level 2)
		Instruments									Instruments
		(Level 1)									(Level 1)
	Assets:									Assets:
	Money market funds	$	558	$	—	$	—	$	558	Money market funds	$	793		$	—		$	—		$	793
	Commercial paper	—		1,077		—		1,077		Commercial paper	—			1,261			—			1,261
	Certificates of deposit	—		256		—		256		Certificates of deposit	—			269			—			269
	Corporate bonds	—		11		—		11		Corporate bonds	—			6			—			6
	Total cash equivalents and short-term investments	558		1,344		—		1,902		Total cash equivalents and short-term investments	793			1,536			—			2,329
	Restricted cash and investments:									Restricted cash and investments:
	Other securities	—		4		—		4		Other securities	—			4			—			4
	Derivative assets	—		1		—		1		Derivative assets	—			5			—			5
	Total assets	$	558	$	1,349	$	—	$	1,907	Total assets	$	793		$	1,545		$	—		$	2,338
	Liabilities:									Liabilities:
	Derivative liabilities	$	—	$	8	$	—	$	8	Derivative liabilities	$	—		$	—		$	—		$	—
	Total liabilities	$	—	$	8	$	—	$	8	Total liabilities	$	—		$	—		$	—		$	—
Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis	'									'
		Fair Value Measurements at Reporting Date Using									Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted		Significant		Significant		Total		(Dollars in millions)	Quoted			Significant			Significant			Total
		Prices in		Other		Unobservable		Balance			Prices in			Other			Unobservable			Balance
		Active		Observable		Inputs					Active			Observable			Inputs
		Markets for		Inputs		(Level 3)					Markets for			Inputs			(Level 3)
		Identical		(Level 2)							Identical			(Level 2)
		Instruments									Instruments
		(Level 1)									(Level 1)
	Assets:									Assets:
	Cash and cash equivalents	$	558	$	1,333	$	—	$	1,891	Cash and cash equivalents	$	793		$	1,516		$	—		$	2,309
	Short-term investments	—		11		—		11		Short-term investments	—			20			—			20
	Restricted cash and investments	—		4		—		4		Restricted cash and investments	—			4			—			4
	Other current assets	—		1		—		1		Other current assets	—			5			—			5
	Total assets	$	558	$	1,349	$	—	$	1,907	Total assets	$	793		$	1,545		$	—		$	2,338
	Liabilities:									Liabilities:
	Accrued expenses	$	—	$	8	$	—	$	8	Accrued expenses	$	—		$	—		$	—		$	—
	Total liabilities	$	—	$	8	$	—	$	8	Total liabilities	$	—		$	—		$	—		$	—
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	'									'
												October 3, 2014						June 27, 2014
										(Dollars in millions)		Carrying			Estimated			Carrying			Estimated
												Amount			Fair Value			Amount			Fair Value
										6.8% Senior Notes due October 2016		$	331		$	364		$	335		$	374
										3.75% Senior Notes due November 2018		800			817			800			820
										6.875% Senior Notes due May 2020		506			537			534			578
										7.00% Senior Notes due November 2021		172			191			251			284
										4.75% Senior Notes due June 2023		1,000			1,027			1,000			1,009
										4.75% Senior Notes due January 2025		1,000			1,012			1,000			995
										Long-term debt		$	3,809		$	3,948		$	3,920		$	4,060

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	3 Months Ended
	Oct. 03, 2014
Equity [Abstract]	'
Schedule of Share Repurchases	'
	(In millions)	Number of	Dollar Value
		Shares	of Shares
		Repurchased	Repurchased
	Repurchased during the three months ended October 3, 2014	3	$	183
	Fiscal year repurchased through October 3, 2014	3	$	183

Guarantees_Tables

Guarantees (Tables)	3 Months Ended
	Sep. 27, 2013
Guarantees [Abstract]	'
Schedule of Product Warranty Liability	'
		For the Three Months Ended
	(Dollars in millions)	October 3,			September 27,
		2014			2013
	Balance, beginning of period	$	273		$	320
	Warranties issued	40			48
	Repairs and replacements	(54		)	(58		)
	Changes in liability for pre-existing warranties, including expirations	6			8
	Warranty liability assumed from business acquisitions	8			—
	Balance, end of period	$	273		$	318

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Oct. 03, 2014
Earnings Per Share [Abstract]	'
Schedule of computation of basic and diluted net income (loss) per share	'
		For the Three Months Ended
	(In millions, except per share data)	October 3,		September 27,
		2014		2013
	Numerator:
	Net income attributable to Seagate Technology plc	$	381	$	427
	Number of shares used in per share calculations:
	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	327		357
	Weighted-average effect of dilutive securities:
	Employee equity award plans	10		11
	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	337		368
	Net income per share attributable to Seagate Technology plc shareholders:
	Basic	$	1.17	$	1.2
	Diluted	$	1.13	$	1.16

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Jun. 27, 2014	Jun. 28, 2013
Schedule of Fiscal Years [Line Items]	'	'	'	'
Number of Weeks in Fiscal Year	'	'	'53	'52
Number Of Weeks In Quarter	'14	'13	'	'
Minimum [Member]	'	'	'	'
Schedule of Fiscal Years [Line Items]	'	'	'	'
Number of Weeks in Fiscal Year	'52	'	'	'52
Maximum [Member]	'	'	'	'
Schedule of Fiscal Years [Line Items]	'	'	'	'
Number of Weeks in Fiscal Year	'53	'	'	'53

Balance_Sheet_Information_Bala

Balance Sheet Information Balance Sheet Information (Narrative) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Cash and investments held as collateral at banks for various performance obligations	$4	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Cost Basis of Other-than-temporarily Imparied Securities	$0	$0

Balance_Sheet_Information_Summ

Balance Sheet Information (Summary of fair value and amortized cost of investments, by major type)(Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	$1,906	$2,333
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	1,906	2,333
Total available-for-sale and trading securities	'	'
Included in Short-term investments	11	20
Included in Restricted cash and investments	4	4
Fair Value, Total Balance [Member]	'	'
Total available-for-sale and trading securities	'	'
Investments, Total Fair Value	1,906	2,333
Included in Cash and cash equivalents	1,891	2,309
Included in Short-term investments	11	20
Included in Restricted cash and investments	4	4
Investments, Total Fair Value	1,906	2,333
Money market funds [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	558	793
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	558	793
Commercial paper [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	1,077	1,261
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	1,077	1,261
Corporate bonds [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	11	6
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	11	6
Certificates of deposit [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	260	273
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	$260	$273

Balance_Sheet_Information_Fair

Balance Sheet Information (Fair value and amortized cost of available-for-sale securities by contractual maturity) (Details) (USD $)	Oct. 03, 2014
In Millions, unless otherwise specified
Amortized Cost	'
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis	$1,900
AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortize	6
AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost	0
Total Amortized Cost	1,906
Fair Value	'
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value	1,900
Available-for-sale Securities, Debt Maturities, after One Through Five Years, at Fair Value	6
Available-for-sale Securities, Debt Maturities, after Five Years Fair Value	0
Total Fair Value	$1,906

Balance_Sheet_Information_Inve

Balance Sheet Information (Inventories) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Inventory, Net [Abstract]	'	'
Raw materials and components	$313	$324
Work-in-process	314	267
Finished goods	444	394
Total inventories	$1,071	$985

Balance_Sheet_Information_Prop

Balance Sheet Information (Property, Equipment and Leasehold Improvements, net) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Property, Plant and Equipment, Net [Abstract]	'	'
Property, equipment and leasehold improvements	$9,135	$8,979
Accumulated depreciation and amortization	-6,979	-6,843
Total property, equipment and leasehold improvements, net	$2,156	$2,136

Balance_Sheet_Information_Accu

Balance Sheet Information (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014		Sep. 27, 2013
Unrealized Gains (Losses) on Cash Flow Hedges	'		'
Beginning Balance	($1)		$0
Other comprehensive income (loss) before reclassifications	-3		1
Amounts reclassified from AOCI	0		0
Other comprehensive income (loss)	-3		1
Ending Balance	-4		1
Unrealized Gains (Losses) on Marketable Securities (a)	'		'
Beginning Balance	0		-3
Other comprehensive income (loss) before reclassifications	0		1
Amounts reclassified from AOCI	0	[1]	0
Other comprehensive income (loss)	0		1
Ending Balance	0		-2
Unrealized Gains (Losses) on post-retirements	'		'
Beginning Balance	-10		-11
Other comprehensive income (loss) before reclassifications	0		0
Amounts reclassified from AOCI	0		0
Other comprehensive income (loss)	0		0
Ending Balance	-10		-11
Foreign currency translation adjustments	'		'
Beginning Balance	9		1
Other comprehensive income (loss) before reclassifications	-10		5
Amounts reclassified from AOCI	0		0
Other comprehensive income (loss)	-10		5
Ending Balance	-1		6
Total	'		'
Beginning Balance	-2		-13
Other comprehensive income before reclassifications	-13		7
Amounts reclassified from AOCI	0		0
Total other comprehensive income (loss), net of tax	-13		7
Ending Balance	($15)		($6)
[1]	The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt_Narrative_Details

Debt (Narrative) (Details) (USD $)	3 Months Ended				3 Months Ended		3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013	Apr. 30, 2013	Jan. 18, 2011	Oct. 03, 2014	Oct. 03, 2014	Oct. 03, 2014	Oct. 03, 2014	22-May-13	28-May-14
					Senior Notes 6.8 Percent due October 2016 [Member]	Senior Notes 3.75 Percent due November 2018 [Member]	Senior Notes 6.875 Percent due May 2020 [Member]	Senior Notes 7.00 Percent Due November 2021 [Member]	Senior Notes 4.75 Percent Due June 2023 [Member]	Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	'	'	$500	$350	'	'	'	'	'	'
Sub-limit for issuance of letters of credit under revolving credit facility	'	'	'	75	'	'	'	'	'	'
Line of Credit Facility Letters of Credit Outstanding	0	'	'	'	'	'	'	'	'	'
Aggregate principal amount	'	'	'	'	600	800	600	600	1,000	1,000
Stated interest rate (as a percent)	'	'	'	'	6.80%	3.75%	6.88%	7.00%	4.75%	4.75%
Repayment of Long-term Debt	'	'	'	'	4	'	28	79	'	'
Loss on repurchase of debt	$14	$0	'	'	($0.50)	'	($2)	($11)	'	'

Debt_Future_principal_payments

Debt (Future principal payments on long-term debt) (Details) (USD $)	Oct. 03, 2014
In Millions, unless otherwise specified
Debt Disclosure [Abstract]	'
Remainder of 2015	$0
2016	0
2017	331
2018	0
2019	-800
Thereafter	2,678
Total future principal payments on long-term debt	$3,809

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'
(Benefit from) provision for income taxes	$11	$13
Discrete tax (benefits) charges	-2	3
Domestic federal statutory rate (as a percent)	25.00%	25.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	1	'
Unrecognized Tax Benefits	114	'
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	114	'
Minimum [Member]	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	3	'
Maximum [Member]	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$50	'

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)	0 Months Ended		12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 02, 2014	Mar. 31, 2014	Jun. 27, 2014	Mar. 31, 2014
	LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]	Xyratex Ltd [Member]	Xyratex Ltd [Member]	Xyratex Ltd [Member]
Business Acquisition [Line Items]	'	'	'	'
Business Acquisition Costs Of Acquired Entity Cash Paid Per Share	'	'	'	$13.25
Cash paid for consideration	$450	$376	'	'
Business Combination, Acquisition Related Costs	$1	'	$10	'

Acquisitions_Fair_Value_Of_Ass

Acquisitions (Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014	Sep. 02, 2014	Mar. 31, 2014
In Millions, unless otherwise specified			LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]	Xyratex Ltd [Member]
Business Acquisition [Line Items]	'	'	'	'
Cash and cash equivalents	'	'	'	$91
Accounts receivable, net	'	'	'	67
Inventories	'	'	37	111
Other current and non-current assets	'	'	'	28
Property, plant and equipment	'	'	22	55
Intangible assets	'	'	141	80
Other current and non-current assets	'	'	6	'
Goodwill	873	537	337	60
Total assets	'	'	543	492
Liabilities	-6,819	-6,660	-93	'
Accounts payable and accrued expenses	'	'	'	-116
Total liabilities	'	'	'	-116
Total	'	'	450	376
Intangible assets	'	'	$141	$41

Acquisitions_Fair_Value_Of_Fin

Acquisitions (Fair Value Of Finite-Lived Intangible Assets Acquired) (Details) (USD $)

Sep. 02, 2014

Sep. 02, 2014

Sep. 02, 2014

Sep. 02, 2014

Sep. 02, 2014

Sep. 02, 2014

Sep. 02, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

In Millions, unless otherwise specified

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]

Xyratex Ltd [Member]

Xyratex Ltd [Member]

Xyratex Ltd [Member]

Xyratex Ltd [Member]

Xyratex Ltd [Member]

Xyratex Ltd [Member]

In Process Research and Development [Member]

Existing technology [Member]

Existing technology [Member]

Customer relationships [Member]

Customer relationships [Member]

Trade name [Member]

Trade name [Member]

Existing technology [Member]

Existing technology [Member]

Customer relationships [Member]

Customer relationships [Member]

Xyratex Ltd [Member]

Intangible assets acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquired identifiable intangible asset, Weighted Average Useful Life

'

'3 years 6 months

'

'3 years 9 months

'

'4 years 6 months

'

'4 years 9 months

'

'5 years 6 months

'

'3 years 11 months

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

$39

Acquired identifiable intangible asset, Amount

141

'

84

'

40

'

17

'

41

'

23

'

18

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill

$141

'

'

'

'

'

'

'

$80

'

'

'

'

'

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
Indefinite-lived Intangible Assets [Line Items]	'	'
Amortization of intangibles	$34	$37
In Process Research and Development [Member]	'	'
Indefinite-lived Intangible Assets [Line Items]	'	'
Indefinite-lived Intangible Assets Acquired	$39	$39

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Changes in the carrying amount of goodwill) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill, Acquired During Period	$337
Goodwill [Roll Forward]	'
Goodwill, Beginning Balance	537
Foreign currency translation effect	-1
Goodwill, Ending Balance	$873

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Carrying value of intangible assets) (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Jun. 27, 2014	Jun. 28, 2013
Intangible assets acquired	'	'	'
Gross Carrying Amount	$674	'	532
Accumulated Amortization	-245	'	-212
Net Carrying Amount	429	'	320
Weighted Average Remaining Useful Life (in years)	'3 years 2 months	'	'3 years 2 months 24 days
Existing technology [Member]	'	'	'
Intangible assets acquired	'	'	'
Gross Carrying Amount	152	68	'
Accumulated Amortization	-27	-18	'
Net Carrying Amount	125	50	'
Weighted Average Remaining Useful Life (in years)	'3 years 2 months 5 days	'	'2 years 10 months 24 days
Customer relationships [Member]	'	'	'
Intangible assets acquired	'	'	'
Gross Carrying Amount	488	450	'
Accumulated Amortization	-215	-192	'
Net Carrying Amount	273	258	'
Weighted Average Remaining Useful Life (in years)	'3 years 1 month	'	'3 years 3 months 24 days
Trade name [Member]	'	'	'
Intangible assets acquired	'	'	'
Gross Carrying Amount	27	10	'
Accumulated Amortization	-2	-1	'
Net Carrying Amount	25	9	'
Weighted Average Remaining Useful Life (in years)	'3 years 11 months	'	'3 years 1 month 24 days
Other Intangible Assets [Member]	'	'	'
Intangible assets acquired	'	'	'
Accumulated Amortization	-1	-1	'
Net Carrying Amount	6	3	'
Weighted Average Remaining Useful Life (in years)	'3 years 9 months	'	'4 years 5 months
Finite-lived Intangible Assets Acquired	$7	$4	'

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets (Expected amortization expense for acquisition-related intangible assets) (Details) (USD $)	Oct. 03, 2014	Jun. 28, 2013
In Millions, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'	'
Remainder of 2015	$115	'
2016	132	'
2017	113	'
2018	52	'
2019	15	'
Thereafter	2	'
Total	$429	$320

Derivative_Financial_Instrumen2

Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014	Sep. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified
Derivative Financial Instruments	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$4	$1	($1)	$0
Total Return Swap [Member]	'	'	'	'
Derivative Financial Instruments	'	'	'	'
Notional value of total return swap	$91	'	'	'

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Schedule of notional value of outstanding foreign currency forward exchange contracts) (Details) (Foreign currency forward exchange contracts [Member], USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Derivatives designated as hedging instruments [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	$235	$34
Derivatives designated as hedging instruments [Member] | Thai Baht [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives designated as hedging instruments [Member] | Singapore dollars [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	142	'
Derivatives designated as hedging instruments [Member] | Chinese Renminbi [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	77	'
Derivatives designated as hedging instruments [Member] | British Pound Sterling	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	12	25
Derivatives designated as hedging instruments [Member] | Malaysia, Ringgits	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	4	9
Derivatives not designated as hedging instruments [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	185	143
Derivatives not designated as hedging instruments [Member] | Thai Baht [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	169	143
Derivatives not designated as hedging instruments [Member] | Singapore dollars [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	16	'
Derivatives not designated as hedging instruments [Member] | Chinese Renminbi [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	'
Derivatives not designated as hedging instruments [Member] | British Pound Sterling	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives not designated as hedging instruments [Member] | Malaysia, Ringgits	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	$0	$0

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Schedule of gross fair value of derivative instruments) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	$1	$5
Liability derivatives, Accrued expenses	-8	0
Derivatives designated as hedging instruments [Member] | Foreign currency forward exchange contracts [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	1	3
Liability derivatives, Accrued expenses	-4	0
Derivatives not designated as hedging instruments [Member] | Foreign currency forward exchange contracts [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	2
Liability derivatives, Accrued expenses	-4	0
Derivatives not designated as hedging instruments [Member] | Total Return Swap [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	'
Liability derivatives, Accrued expenses	0	0
Derivative Liability, Fair Value, Gross Asset	'	$0

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations) (Details) (USD $)	3 Months Ended
	Oct. 03, 2014	Sep. 27, 2013
Foreign currency forward exchange contracts [Member]	'	'
Derivatives Instruments, Gain (Loss)	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	($4,000,000)	$1,000,000
Total Return Swap [Member]	'	'
Derivatives Instruments, Gain (Loss)	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	-3,000,000	'
Cash Flow Hedges [Member] | Foreign currency forward exchange contracts [Member]	'	'
Derivatives Instruments, Gain (Loss)	'	'
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	-3,000,000	1,000,000
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	0
Amount of Gain or (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (a)	1,000,000	0
Gain or (loss) recognized in income, ineffective portion of hedging relationship	0	0
Gain or (loss) recognized in income, amount excluded from assessment of hedge effectiveness	$0	$0

Fair_Value_Narrative_Details

Fair Value (Narrative) (Details) (USD $)	Oct. 03, 2014	Jun. 28, 2013
In Millions, unless otherwise specified
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation	'	'
Cost Method Investments	$52	$46

Fair_Value_Schedule_of_Fair_Va

Fair Value (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	$4	$4
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	558	793
Restricted cash and investments	0	0
Other current assets	0	0
Total Assets	558	793
Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	558	793
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	'
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	'	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,344	1,536
Restricted cash and investments	4	4
Other current assets	1	5
Total Assets	1,349	1,545
Derivative liabilities	8	0
Total Liabilities	8	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,077	1,261
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	256	269
Restricted cash and investments	4	'
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	11	6
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	'	4
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	1	5
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	8	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	0
Other current assets	0	0
Total Assets	0	0
Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	'
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	'	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	0
Recurring basis [Member] | Fair Value, Total Balance [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,902	2,329
Restricted cash and investments	4	4
Other current assets	1	5
Total Assets	1,907	2,338
Derivative liabilities	8	0
Total Liabilities	8	0
Recurring basis [Member] | Fair Value, Total Balance [Member] | Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	558	793
Recurring basis [Member] | Fair Value, Total Balance [Member] | Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,077	1,261
Recurring basis [Member] | Fair Value, Total Balance [Member] | Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	256	269
Restricted cash and investments	4	'
Recurring basis [Member] | Fair Value, Total Balance [Member] | Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	11	6
Recurring basis [Member] | Fair Value, Total Balance [Member] | Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	'	4
Recurring basis [Member] | Fair Value, Total Balance [Member] | Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	1	5
Recurring basis [Member] | Fair Value, Total Balance [Member] | Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	$8	$0

Fair_Value_Schedule_of_Fair_Va1

Fair Value (Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Assets and liabilities measured at fair value on a recurring basis	'	'
Short-term investments	$11	$20
Restricted cash and investments	4	4
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	558	793
Short-term investments	0	0
Restricted cash and investments	0	0
Other current assets	0	0
Total Assets	558	793
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	1,333	1,516
Short-term investments	11	20
Restricted cash and investments	4	4
Other current assets	1	5
Total Assets	1,349	1,545
Accrued expenses - Derivative liabilities	8	0
Total Liabilities	8	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	0	0
Short-term investments	0	0
Restricted cash and investments	0	0
Other current assets	0	0
Total Assets	0	0
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Fair Value, Total Balance [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	1,891	2,309
Short-term investments	11	20
Restricted cash and investments	4	4
Other current assets	1	5
Total Assets	1,907	2,338
Accrued expenses - Derivative liabilities	8	0
Total Liabilities	$8	$0

Fair_Value_Schedule_of_Carryin

Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) (USD $)	Oct. 03, 2014	Jun. 27, 2014
In Millions, unless otherwise specified
Debt Fair Value Disclosures	'	'
Long-term debt	$3,809	$3,920
Carrying Amount [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	3,809	3,920
Carrying Amount [Member] | Senior Notes 6.8 Percent due October 2016 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	331	335
Carrying Amount [Member] | Senior Notes 3.75 Percent due November 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	800	800
Carrying Amount [Member] | Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	506	534
Carrying Amount [Member] | Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	172	251
Carrying Amount [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	1,000	1,000
Carrying Amount [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	1,000	1,000
Fair Value, Total Balance [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	3,948	4,060
Fair Value, Total Balance [Member] | Senior Notes 6.8 Percent due October 2016 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	364	374
Fair Value, Total Balance [Member] | Senior Notes 3.75 Percent due November 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	817	820
Fair Value, Total Balance [Member] | Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	537	578
Fair Value, Total Balance [Member] | Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	191	284
Fair Value, Total Balance [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	1,027	1,009
Fair Value, Total Balance [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	$1,012	$995

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)	Oct. 03, 2014	Jul. 24, 2013
		July2013ShareRepurchaseProgram [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Authorized share capital (in dollars)	$13,500	'
Ordinary shares, authorized	1,250,000,000	'
Ordinary shares, par value (in dollars per share)	$0.00	'
Ordinary shares, outstanding	327,176,198	'
Preferred shares, authorized	100,000,000	'
Preferred shares, par value (in dollars per share)	$0.00	'
Preferred Stock Minimum Number of Series	1	'
Stock Repurchase Program, Authorized Amount	'	2,500,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$1,300,000,000	'

Shareholders_Equity_Schedule_o

Shareholders' Equity (Schedule of Share Repurchases) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014
Equity [Abstract]	'
Stock Repurchased and Retired During Period, Shares	3
Stock Repurchased and Retired During Period, Value	$183

Compensation_Narrative_Details

Compensation (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Share-based compensation	$42	$27

Guarantees_Guarantees_Narrativ

Guarantees Guarantees (Narrative) (Details)	3 Months Ended
	Oct. 03, 2014
Minimum [Member]	'
Schedule of Fiscal Years [Line Items]	'
Product Warranty Period Term, Minimum	'1 year
Maximum [Member]	'
Schedule of Fiscal Years [Line Items]	'
Product Warranty Period Term, Minimum	'5 years

Guarantees_Product_Warranty_De

Guarantees (Product Warranty) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
Guarantees [Abstract]	'	'
Balance, beginning of period	$273	$320
Warranties issued	40	48
Repairs and replacements	-54	-58
Changes in liability for pre-existing warranties, including expirations	6	8
Warranty liability assumed from business acquisitions	8	0
Balance, end of period	$273	$318

Earnings_Per_Share_Schedule_of

Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Oct. 03, 2014	Sep. 27, 2013
Numerator:	'	'
Net income attributable to Seagate Technology plc	$381	$427
Number of shares used in per share calculations:	'	'
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	327	357
Weighted-average effect of dilutive securities:	'	'
Employee equity award plans	10	11
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	337	368
Net income per share attributable to Seagate Technology plc ordinary shareholders:	'	'
Basic net income per share (in dollars per share)	$1.17	$1.20
Diluted net income per share (in dollars per share)	$1.13	$1.16

Legal_Environmental_and_Other_1

Legal, Environmental and Other Contingencies (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Oct. 03, 2014
Convolve and MIT Litigation [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Compensatory Damages Sought	$800
Alexander Shukh Litigation [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency Damages Sought Amount in Excess	75
LEAP Co., Ltd. [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Damages Sought, Value	$38

Subsequent_Events_Narrative_De

Subsequent Events (Narrative) (Details) (Subsequent Event [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Oct. 14, 2014	Jan. 23, 2012
Subsequent Event [Member]	'	'
Subsequent Event [Line Items]	'	'
Settlement amount awarded	'	$525
Settlement amount awarded including interest	'	630
Settlement award interest rate	'	10.00%
Settlement amount partial payment	$773	'