3.20.1 html 298 366 1 false 74 0 false 4 false false R1.htm 0001001 - Document - Cover page Sheet http://www.seagate.com/role/Coverpage Cover page Cover 1 false false R2.htm 1001002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://www.seagate.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS CONDENSED CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 1002003 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.seagate.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Statements 3 false false R4.htm 1003004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.seagate.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 4 false false R5.htm 1004005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.seagate.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 5 false false R6.htm 1005006 - Statement - CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY Sheet http://www.seagate.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSHAREHOLDERSEQUITY CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY Statements 6 false false R7.htm 2101101 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies Sheet http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies Basis of Presentation and Summary of Significant Accounting Policies Notes 7 false false R8.htm 2105102 - Disclosure - Balance Sheet Information Sheet http://www.seagate.com/role/BalanceSheetInformation Balance Sheet Information Notes 8 false false R9.htm 2116103 - Disclosure - Debt Sheet http://www.seagate.com/role/Debt Debt Notes 9 false false R10.htm 2120104 - Disclosure - Income Taxes Sheet http://www.seagate.com/role/IncomeTaxes Income Taxes Notes 10 false false R11.htm 2122105 - Disclosure - Leases Sheet http://www.seagate.com/role/Leases Leases Notes 11 false false R12.htm 2128106 - Disclosure - Restructuring and Exit Costs Sheet http://www.seagate.com/role/RestructuringandExitCosts Restructuring and Exit Costs Notes 12 false false R13.htm 2131107 - Disclosure - Derivative Financial Instruments Sheet http://www.seagate.com/role/DerivativeFinancialInstruments Derivative Financial Instruments Notes 13 false false R14.htm 2137108 - Disclosure - Fair Value Sheet http://www.seagate.com/role/FairValue Fair Value Notes 14 false false R15.htm 2144109 - Disclosure - Equity Sheet http://www.seagate.com/role/Equity Equity Notes 15 false false R16.htm 2148110 - Disclosure - Revenue Sheet http://www.seagate.com/role/Revenue Revenue Notes 16 false false R17.htm 2151111 - Disclosure - Guarantees Sheet http://www.seagate.com/role/Guarantees Guarantees Notes 17 false false R18.htm 2155112 - Disclosure - Earnings Per Share Sheet http://www.seagate.com/role/EarningsPerShare Earnings Per Share Notes 18 false false R19.htm 2158113 - Disclosure - Legal, Environmental and Other Contingencies Sheet http://www.seagate.com/role/LegalEnvironmentalandOtherContingencies Legal, Environmental and Other Contingencies Notes 19 false false R20.htm 2159114 - Disclosure - Subsequent event Sheet http://www.seagate.com/role/Subsequentevent Subsequent event Notes 20 false false R21.htm 2202201 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies) Sheet http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies Basis of Presentation and Summary of Significant Accounting Policies (Policies) Policies http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies 21 false false R22.htm 2223202 - Disclosure - Leases Leases (Policies) Sheet http://www.seagate.com/role/LeasesLeasesPolicies Leases Leases (Policies) Policies http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies 22 false false R23.htm 2243203 - Disclosure - Fair Value Measures and Disclosures (Policies) Sheet http://www.seagate.com/role/FairValueMeasuresandDisclosuresPolicies Fair Value Measures and Disclosures (Policies) Policies http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies 23 false false R24.htm 2306301 - Disclosure - Balance Sheet Information (Tables) Sheet http://www.seagate.com/role/BalanceSheetInformationTables Balance Sheet Information (Tables) Tables http://www.seagate.com/role/BalanceSheetInformation 24 false false R25.htm 2317302 - Disclosure - Debt (Tables) Sheet http://www.seagate.com/role/DebtTables Debt (Tables) Tables http://www.seagate.com/role/Debt 25 false false R26.htm 2324303 - Disclosure - Leases (Tables) Sheet http://www.seagate.com/role/LeasesTables Leases (Tables) Tables http://www.seagate.com/role/Leases 26 false false R27.htm 2329304 - Disclosure - Restructuring and Exit Costs Restructuring and Exit Costs (Tables) Sheet http://www.seagate.com/role/RestructuringandExitCostsRestructuringandExitCostsTables Restructuring and Exit Costs Restructuring and Exit Costs (Tables) Tables 27 false false R28.htm 2332305 - Disclosure - Derivative Financial Instruments (Tables) Sheet http://www.seagate.com/role/DerivativeFinancialInstrumentsTables Derivative Financial Instruments (Tables) Tables http://www.seagate.com/role/DerivativeFinancialInstruments 28 false false R29.htm 2338306 - Disclosure - Fair Value (Tables) Sheet http://www.seagate.com/role/FairValueTables Fair Value (Tables) Tables http://www.seagate.com/role/FairValue 29 false false R30.htm 2345307 - Disclosure - Equity (Tables) Sheet http://www.seagate.com/role/EquityTables Equity (Tables) Tables http://www.seagate.com/role/Equity 30 false false R31.htm 2349308 - Disclosure - Revenue (Tables) Sheet http://www.seagate.com/role/RevenueTables Revenue (Tables) Tables http://www.seagate.com/role/Revenue 31 false false R32.htm 2352309 - Disclosure - Guarantees (Tables) Sheet http://www.seagate.com/role/GuaranteesTables Guarantees (Tables) Tables http://www.seagate.com/role/Guarantees 32 false false R33.htm 2356310 - Disclosure - Earnings Per Share (Tables) Sheet http://www.seagate.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.seagate.com/role/EarningsPerShare 33 false false R34.htm 2403401 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) Sheet http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesNarrativeDetails Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) Details http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies 34 false false R35.htm 2404402 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies Cumulative effect of the change to the Condensed Consolidated Balance Sheet from the adoption of ASC 606 (Details) Sheet http://www.seagate.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesCumulativeeffectofthechangetotheCondensedConsolidatedBalanceSheetfromtheadoptionofASC606Details Basis of Presentation and Summary of Significant Accounting Policies Cumulative effect of the change to the Condensed Consolidated Balance Sheet from the adoption of ASC 606 (Details) Details 35 false false R36.htm 2407403 - Disclosure - Balance Sheet Information (Summary of fair value and amortized cost of investments, by major type) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationSummaryoffairvalueandamortizedcostofinvestmentsbymajortypeDetails Balance Sheet Information (Summary of fair value and amortized cost of investments, by major type) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 36 false false R37.htm 2408404 - Disclosure - Balance Sheet Information Balance Sheet Information (Available-for-Sale Debt Securities) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationBalanceSheetInformationAvailableforSaleDebtSecuritiesDetails Balance Sheet Information Balance Sheet Information (Available-for-Sale Debt Securities) (Details) Details 37 false false R38.htm 2409405 - Disclosure - Balance Sheet Information (Fair value and amortized cost of available-for-sale securities by contractual maturity) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationFairvalueandamortizedcostofavailableforsalesecuritiesbycontractualmaturityDetails Balance Sheet Information (Fair value and amortized cost of available-for-sale securities by contractual maturity) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 38 false false R39.htm 2410406 - Disclosure - Balance Sheet Information (Cash, Cash Equivalents, and Restricted Cash) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationCashCashEquivalentsandRestrictedCashDetails Balance Sheet Information (Cash, Cash Equivalents, and Restricted Cash) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 39 false false R40.htm 2411407 - Disclosure - Balance Sheet Information Balance Sheet Information (Accounts Receivable, net) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationBalanceSheetInformationAccountsReceivablenetDetails Balance Sheet Information Balance Sheet Information (Accounts Receivable, net) (Details) Details 40 false false R41.htm 2412408 - Disclosure - Balance Sheet Information (Inventories) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationInventoriesDetails Balance Sheet Information (Inventories) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 41 false false R42.htm 2413409 - Disclosure - Balance Sheet Information (Property, Equipment and Leasehold Improvements, net) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationPropertyEquipmentandLeaseholdImprovementsnetDetails Balance Sheet Information (Property, Equipment and Leasehold Improvements, net) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 42 false false R43.htm 2414410 - Disclosure - Balance Sheet Information (Accrued expenses) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationAccruedexpensesDetails Balance Sheet Information (Accrued expenses) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 43 false false R44.htm 2415411 - Disclosure - Balance Sheet Information (AOCI) (Details) Sheet http://www.seagate.com/role/BalanceSheetInformationAOCIDetails Balance Sheet Information (AOCI) (Details) Details http://www.seagate.com/role/BalanceSheetInformationTables 44 false false R45.htm 2418412 - Disclosure - Debt (Narrative) (Details) Sheet http://www.seagate.com/role/DebtNarrativeDetails Debt (Narrative) (Details) Details http://www.seagate.com/role/DebtTables 45 false false R46.htm 2419413 - Disclosure - Debt (Future principal payments on long-term debt) (Details) Sheet http://www.seagate.com/role/DebtFutureprincipalpaymentsonlongtermdebtDetails Debt (Future principal payments on long-term debt) (Details) Details http://www.seagate.com/role/DebtTables 46 false false R47.htm 2421414 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.seagate.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.seagate.com/role/IncomeTaxes 47 false false R48.htm 2425415 - Disclosure - Leases - Operating Lease Costs (Details) Sheet http://www.seagate.com/role/LeasesOperatingLeaseCostsDetails Leases - Operating Lease Costs (Details) Details 48 false false R49.htm 2426416 - Disclosure - Leases - Supplemental Balance Sheet Information (Details) Sheet http://www.seagate.com/role/LeasesSupplementalBalanceSheetInformationDetails Leases - Supplemental Balance Sheet Information (Details) Details 49 false false R50.htm 2427417 - Disclosure - Leases - Lease Maturity (Details) Sheet http://www.seagate.com/role/LeasesLeaseMaturityDetails Leases - Lease Maturity (Details) Details 50 false false R51.htm 2430418 - Disclosure - Restructuring and Exit Costs (Details) Sheet http://www.seagate.com/role/RestructuringandExitCostsDetails Restructuring and Exit Costs (Details) Details http://www.seagate.com/role/RestructuringandExitCostsRestructuringandExitCostsTables 51 false false R52.htm 2433419 - Disclosure - Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) Sheet http://www.seagate.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNarrativeDetails Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) Details 52 false false R53.htm 2434420 - Disclosure - Derivative Financial Instruments (Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations) (Details) Sheet http://www.seagate.com/role/DerivativeFinancialInstrumentsScheduleoftheeffectofderivativeinstrumentsonOthercomprehensiveincomelossandtheConsolidatedStatementofOperationsDetails Derivative Financial Instruments (Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations) (Details) Details http://www.seagate.com/role/DerivativeFinancialInstrumentsTables 53 false false R54.htm 2435421 - Disclosure - Derivative Financial Instruments Derivative Financial Instruments (Schedule of notional value of outstanding foreign currency forward exchange contracts) (Details) Sheet http://www.seagate.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsScheduleofnotionalvalueofoutstandingforeigncurrencyforwardexchangecontractsDetails Derivative Financial Instruments Derivative Financial Instruments (Schedule of notional value of outstanding foreign currency forward exchange contracts) (Details) Details 54 false false R55.htm 2436422 - Disclosure - Derivative Financial Instruments Derivative Financial Instruments (Schedule of gross fair value of derivative instruments) (Details) Sheet http://www.seagate.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsScheduleofgrossfairvalueofderivativeinstrumentsDetails Derivative Financial Instruments Derivative Financial Instruments (Schedule of gross fair value of derivative instruments) (Details) Details 55 false false R56.htm 2439423 - Disclosure - Fair Value (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) Sheet http://www.seagate.com/role/FairValueScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails Fair Value (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) Details http://www.seagate.com/role/FairValueTables 56 false false R57.htm 2440424 - Disclosure - Fair Value (Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis) (Details) Sheet http://www.seagate.com/role/FairValueScheduleofFairValuebyBalanceSheetGroupingMeasuredonRecurringBasisDetails Fair Value (Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis) (Details) Details http://www.seagate.com/role/FairValueTables 57 false false R58.htm 2441425 - Disclosure - Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) Sheet http://www.seagate.com/role/FairValueScheduleofCarryingValuesandEstimatedFairValuesofDebtInstrumentsDetails Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) Details http://www.seagate.com/role/FairValueTables 58 false false R59.htm 2442426 - Disclosure - Fair Value (Narrative) (Details) Sheet http://www.seagate.com/role/FairValueNarrativeDetails Fair Value (Narrative) (Details) Details http://www.seagate.com/role/FairValueTables 59 false false R60.htm 2446427 - Disclosure - Equity (Narrative) (Details) Sheet http://www.seagate.com/role/EquityNarrativeDetails Equity (Narrative) (Details) Details http://www.seagate.com/role/EquityTables 60 false false R61.htm 2447428 - Disclosure - Equity (Schedule of Share Repurchases) (Details) Sheet http://www.seagate.com/role/EquityScheduleofShareRepurchasesDetails Equity (Schedule of Share Repurchases) (Details) Details http://www.seagate.com/role/EquityTables 61 false false R62.htm 2450429 - Disclosure - Revenue (Details) Sheet http://www.seagate.com/role/RevenueDetails Revenue (Details) Details http://www.seagate.com/role/RevenueTables 62 false false R63.htm 2453430 - Disclosure - Guarantees Guarantees (Narrative) (Details) Sheet http://www.seagate.com/role/GuaranteesGuaranteesNarrativeDetails Guarantees Guarantees (Narrative) (Details) Details 63 false false R64.htm 2454431 - Disclosure - Guarantees (Product Warranty) (Details) Sheet http://www.seagate.com/role/GuaranteesProductWarrantyDetails Guarantees (Product Warranty) (Details) Details http://www.seagate.com/role/GuaranteesTables 64 false false R65.htm 2457432 - Disclosure - Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) Sheet http://www.seagate.com/role/EarningsPerShareScheduleofcomputationofbasicanddilutednetincomelosspershareDetails Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) Details http://www.seagate.com/role/EarningsPerShareTables 65 false false R66.htm 2460433 - Disclosure - Subsequent event (Details) Sheet http://www.seagate.com/role/SubsequenteventDetails Subsequent event (Details) Details http://www.seagate.com/role/Subsequentevent 66 false false R9999.htm Uncategorized Items - stx-20200403.htm Sheet http://xbrl.sec.gov/role/uncategorizedFacts Uncategorized Items - stx-20200403.htm Cover 67 false false All Reports Book All Reports stx-20200403.htm stx-20200403.xsd stx-20200403_cal.xml stx-20200403_def.xml stx-20200403_lab.xml stx-20200403_pre.xml stx-ex31120200403nextg.htm stx-ex31220200403nextg.htm stx-ex32120200403nextg.htm http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/srt/2018-01-31 http://fasb.org/us-gaap/2018-01-31 http://xbrl.sec.gov/country/2017-01-31 http://xbrl.sec.gov/currency/2017-01-31 true true