Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
Jan. 01, 2016
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Organization Seagate Technology plc (the "Company") is a leading provider of electronic data storage technology and solutions. Its principal products are hard disk drives, commonly referred to as disk drives, hard drives or HDDs. In addition to HDDs, it produces a broad range of electronic data storage products including solid state hybrid drives ("SSHD"), solid state drives ("SSD"), PCIe cards and SATA controllers. Its storage technology portfolio also includes storage subsystems, high performance computing ("HPC") solutions, and data storage services. Hard disk drives are devices that store digitally encoded data on rapidly rotating disks with magnetic surfaces. Disk drives continue to be the primary medium of mass data storage due to their performance attributes, high quality and cost effectiveness. Complementing existing data center storage architecture, solid-state storage devices use integrated circuit assemblies as memory to store data, and most SSDs use NAND-based flash memory. In addition to HDDs and SSDs, SSHDs combine the features of SSDs and HDDs in the same unit, containing a large hard disk drive and an SSD cache to improve performance of frequently accessed data. 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, digital media systems and surveillance systems. The Company's product and solution portfolio for the enterprise data storage industry includes storage enclosures, integrated application platforms and HPC data storage solutions. Its storage subsystems support a range of high-speed interconnect technologies to meet demanding cost and performance specifications. Its 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. 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. Certain prior period amounts in the condensed consolidated financial statements and notes to the condensed consolidated financial statements have been reclassified to conform to the current period’s presentation. The Company’s Consolidated Financial Statements for the fiscal year ended July 3, 2015, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 11, 2015. 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 July 3, 2015, and the notes thereto, are adequate to make the information presented not misleading. The results of operations for the three and six months ended January 1, 2016, 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 1, 2016. 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 and six months ended January 1, 2016 consisted of 13 weeks and 26 weeks, respectively. The three and six months ended January 2, 2015 consisted of 14 weeks and 27 weeks, respectively. Fiscal year 2016 will be comprised of 52 weeks and will end on July 1, 2016. The fiscal quarters ended January 1, 2016, October 2, 2015, and January 2, 2015, are also referred to herein as the “December 2015 quarter”, the “September 2015 quarter”, and the “December 2014 quarter”, respectively. Summary of Significant Accounting Policies There have been no significant changes in the Company's 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 July 3, 2015, as filed with the SEC on August 11, 2015 for a discussion of the Company’s other significant accounting policies. Recently Issued Accounting Pronouncements In May 2014 and August 2015, the FASB issued ASU 2014-09 (ASC Topic 606), Revenue from Contracts with Customers and ASU 2015-14 (ASC Topic 606) Revenue from Contracts with Customers, Deferral of the Effective Date, respectively. 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 amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. Early adoption is permitted for annual periods beginning after December 15, 2016. The Company is in the process of assessing the impact, if any, on its consolidated financial statements. In April 2015 and August 2015, the FASB issued ASU 2015-03 (ASC Subtopic 835-30), Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs and ASU 2015-15 (ASC Subtopic 835-30), Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements- Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting, respectively. The ASUs require that debt issuance costs related to a recognized debt liability, with the exception of those related to line-of-credit arrangements, be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The amendments in these ASUs are effective for fiscal years, and interim periods within those years, beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this new guidance is not expected to have a material impact on the Company’s consolidated financial statements and disclosures. In July 2015, the FASB issued ASU 2015-11 (ASC Topic 330), Inventory: Simplifying the Measurement of Inventory. The amendments in this ASU require inventory measurement at the lower of cost and net realizable value. The amendments in this ASU are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted by all entities as of the beginning of an interim or annual reporting period. The Company is in the process of assessing the impact, if any, of this ASU on its consolidated financial statements. In September 2015, the FASB issued ASU 2015-16 (ASC Topic 805), Business Combinations Simplifying the Accounting for Measurement-Period Adjustments. The amendments in this update require that an acquirer recognize measurement period adjustments in the period in which the adjustments are determined. The income effects of such measurement period adjustments are to be recorded in the same period’s financial statements but calculated as if the accounting had been completed as of the acquisition date. The impact of measurement period adjustments to earnings that relate to prior period financial statements are to be presented separately on the income statement or disclosed by line item. The amendments in this update are for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted for public business entities for reporting periods for which financial statements have not yet been issued. The adoption of this new guidance is not expected to have a material impact on the Company’s consolidated financial statements and disclosures. In November 2015, the FASB issued ASU 2015-17 (ASC Topic 740), Income Taxes Balance Sheet Classification of Deferred Taxes. The amendments in this Update are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted by all entities as of the beginning of an interim or annual reporting period. The Company early adopted this ASU for the December 2015 quarter on a prospective basis. See footnote 4 for disclosure of the financial statement impact of this adoption. In January 2016, the FASB issued ASU 2016-01 (ASC Subtopic 825-10), Financial Instruments- Overall Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in this ASU require entities to measure all investments in equity securities at fair value with changes recognized through net income. This requirement does not apply to investments that qualify for the equity method of accounting, to those that result in consolidation of the investee, or for which the entity meets a practicability exception to fair value measurement. Additionally, the amendments eliminate certain disclosure requirements related to financial instruments measured at amortized cost and add disclosures related to the measurement categories of financial assets and financial liabilities. The amendments in this ASU are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted for only certain portions of the ASU. The Company is in the process of assessing the impact, if any, on its consolidated financial statements.

Basis of Presentation and Summary of Significant Accounting Policies

Organization

Seagate Technology plc (the "Company") is a leading provider of electronic data storage technology and solutions. Its principal products are hard disk drives, commonly referred to as disk drives, hard drives or HDDs. In addition to HDDs, it produces a broad range of electronic data storage products including solid state hybrid drives ("SSHD"), solid state drives ("SSD"), PCIe cards and SATA controllers. Its storage technology portfolio also includes storage subsystems, high performance computing ("HPC") solutions, and data storage services.

Hard disk drives are devices that store digitally encoded data on rapidly rotating disks with magnetic surfaces. Disk drives continue to be the primary medium of mass data storage due to their performance attributes, high quality and cost effectiveness. Complementing existing data center storage architecture, solid-state storage devices use integrated circuit assemblies as memory to store data, and most SSDs use NAND-based flash memory. In addition to HDDs and SSDs, SSHDs combine the features of SSDs and HDDs in the same unit, containing a large hard disk drive and an SSD cache to improve performance of frequently accessed data.

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, digital media systems and surveillance systems.

The Company's product and solution portfolio for the enterprise data storage industry includes storage enclosures, integrated application platforms and HPC data storage solutions. Its storage subsystems support a range of high-speed interconnect technologies to meet demanding cost and performance specifications. Its 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.

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. Certain prior period amounts in the condensed consolidated financial statements and notes to the condensed consolidated financial statements have been reclassified to conform to the current period’s presentation.

The Company’s Consolidated Financial Statements for the fiscal year ended July 3, 2015, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 11, 2015. 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 July 3, 2015, and the notes thereto, are adequate to make the information presented not misleading.

The results of operations for the three and six months ended January 1, 2016, 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 1, 2016. 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 and six months ended January 1, 2016 consisted of 13 weeks and 26 weeks, respectively. The three and six months ended January 2, 2015 consisted of 14 weeks and 27 weeks, respectively. Fiscal year 2016 will be comprised of 52 weeks and will end on July 1, 2016. The fiscal quarters ended January 1, 2016, October 2, 2015, and January 2, 2015, are also referred to herein as the “December 2015 quarter”, the “September 2015 quarter”, and the “December 2014 quarter”, respectively.

Summary of Significant Accounting Policies

There have been no significant changes in the Company's 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 July 3, 2015, as filed with the SEC on August 11, 2015 for a discussion of the Company’s other significant accounting policies.

Recently Issued Accounting Pronouncements

In May 2014 and August 2015, the FASB issued ASU 2014-09 (ASC Topic 606), Revenue from Contracts with Customers and ASU 2015-14 (ASC Topic 606) Revenue from Contracts with Customers, Deferral of the Effective Date, respectively. 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 amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. Early adoption is permitted for annual periods beginning after December 15, 2016. The Company is in the process of assessing the impact, if any, on its consolidated financial statements.

In April 2015 and August 2015, the FASB issued ASU 2015-03 (ASC Subtopic 835-30), Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs and ASU 2015-15 (ASC Subtopic 835-30), Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements- Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting, respectively. The ASUs require that debt issuance costs related to a recognized debt liability, with the exception of those related to line-of-credit arrangements, be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The amendments in these ASUs are effective for fiscal years, and interim periods within those years, beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this new guidance is not expected to have a material impact on the Company’s consolidated financial statements and disclosures.

In July 2015, the FASB issued ASU 2015-11 (ASC Topic 330), Inventory: Simplifying the Measurement of Inventory. The amendments in this ASU require inventory measurement at the lower of cost and net realizable value. The amendments in this ASU are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted by all entities as of the beginning of an interim or annual reporting period. The Company is in the process of assessing the impact, if any, of this ASU on its consolidated financial statements.

In September 2015, the FASB issued ASU 2015-16 (ASC Topic 805), Business Combinations Simplifying the Accounting for Measurement-Period Adjustments. The amendments in this update require that an acquirer recognize measurement period adjustments in the period in which the adjustments are determined. The income effects of such measurement period adjustments are to be recorded in the same period’s financial statements but calculated as if the accounting had been completed as of the acquisition date. The impact of measurement period adjustments to earnings that relate to prior period financial statements are to be presented separately on the income statement or disclosed by line item. The amendments in this update are for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted for public business entities for reporting periods for which financial statements have not yet been issued. The adoption of this new guidance is not expected to have a material impact on the Company’s consolidated financial statements and disclosures.

In November 2015, the FASB issued ASU 2015-17 (ASC Topic 740), Income Taxes Balance Sheet Classification of Deferred Taxes. The amendments in this Update are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted by all entities as of the beginning of an interim or annual reporting period. The Company early adopted this ASU for the December 2015 quarter on a prospective basis. See footnote 4 for disclosure of the financial statement impact of this adoption.

In January 2016, the FASB issued ASU 2016-01 (ASC Subtopic 825-10), Financial Instruments- Overall Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in this ASU require entities to measure all investments in equity securities at fair value with changes recognized through net income. This requirement does not apply to investments that qualify for the equity method of accounting, to those that result in consolidation of the investee, or for which the entity meets a practicability exception to fair value measurement. Additionally, the amendments eliminate certain disclosure requirements related to financial instruments measured at amortized cost and add disclosures related to the measurement categories of financial assets and financial liabilities. The amendments in this ASU are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted for only certain portions of the ASU. The Company is in the process of assessing the impact, if any, on its consolidated financial statements.