3.3.1.900 html 273 272 1 false 80 0 false 10 false false R1.htm 00090 - Document - Document And Entity Information Sheet http://www.zayo.com/role/DocumentDocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 00100 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) Sheet http://www.zayo.com/role/StatementCondensedConsolidatedBalanceSheetsUnaudited CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) Statements 2 false false R3.htm 00105 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) Sheet http://www.zayo.com/role/StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) Sheet http://www.zayo.com/role/StatementCondensedConsolidatedStatementsOfOperationsUnaudited CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) Statements 4 false false R5.htm 00300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) Sheet http://www.zayo.com/role/StatementCondensedConsolidatedStatementsOfComprehensiveLossUnaudited CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) Statements 5 false false R6.htm 00400 - Statement - CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) Sheet http://www.zayo.com/role/StatementCondensedConsolidatedStatementOfStockholdersEquityUnaudited CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) Statements 6 false false R7.htm 00500 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.zayo.com/role/StatementCondensedConsolidatedStatementsOfCashFlows CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 10101 - Disclosure - Business and Basis of Presentation Sheet http://www.zayo.com/role/DisclosureBusinessAndBasisOfPresentation Business and Basis of Presentation Notes 8 false false R9.htm 10201 - Disclosure - Acquisitions Sheet http://www.zayo.com/role/DisclosureAcquisitions Acquisitions Notes 9 false false R10.htm 10301 - Disclosure - Goodwill Sheet http://www.zayo.com/role/DisclosureGoodwill Goodwill Notes 10 false false R11.htm 10401 - Disclosure - Intangible Assets Sheet http://www.zayo.com/role/DisclosureIntangibleAssets Intangible Assets Notes 11 false false R12.htm 10501 - Disclosure - Long-Term Debt Sheet http://www.zayo.com/role/DisclosureLongTermDebt Long-Term Debt Notes 12 false false R13.htm 10601 - Disclosure - Income Taxes Sheet http://www.zayo.com/role/DisclosureIncomeTaxes Income Taxes Notes 13 false false R14.htm 10701 - Disclosure - Equity Sheet http://www.zayo.com/role/DisclosureEquity Equity Notes 14 false false R15.htm 10801 - Disclosure - Stock-Based Compensation Sheet http://www.zayo.com/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 15 false false R16.htm 10901 - Disclosure - Fair Value Measurements Sheet http://www.zayo.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 16 false false R17.htm 11001 - Disclosure - Commitments and Contingencies Sheet http://www.zayo.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 17 false false R18.htm 11101 - Disclosure - Related Party Transactions Sheet http://www.zayo.com/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 18 false false R19.htm 11201 - Disclosure - Segment Reporting Sheet http://www.zayo.com/role/DisclosureSegmentReporting Segment Reporting Notes 19 false false R20.htm 11301 - Disclosure - Condensed Consolidating Financial Information Sheet http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformation Condensed Consolidating Financial Information Notes 20 false false R21.htm 11401 - Disclosure - Subsequent Events Sheet http://www.zayo.com/role/DisclosureSubsequentEvents Subsequent Events Notes 21 false false R22.htm 20202 - Disclosure - Business and Basis of Presentation (Policies) Sheet http://www.zayo.com/role/DisclosureBusinessAndBasisOfPresentationPolicies Business and Basis of Presentation (Policies) Policies 22 false false R23.htm 30203 - Disclosure - Acquisitions (Tables) Sheet http://www.zayo.com/role/DisclosureAcquisitionsTables Acquisitions (Tables) Tables http://www.zayo.com/role/DisclosureAcquisitions 23 false false R24.htm 30303 - Disclosure - Goodwill (Tables) Sheet http://www.zayo.com/role/DisclosureGoodwillTables Goodwill (Tables) Tables http://www.zayo.com/role/DisclosureGoodwill 24 false false R25.htm 30403 - Disclosure - Intangible Assets (Tables) Sheet http://www.zayo.com/role/DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.zayo.com/role/DisclosureIntangibleAssets 25 false false R26.htm 30503 - Disclosure - Long-Term Debt (Tables) Sheet http://www.zayo.com/role/DisclosureLongTermDebtTables Long-Term Debt (Tables) Tables http://www.zayo.com/role/DisclosureLongTermDebt 26 false false R27.htm 30603 - Disclosure - Income Taxes (Tables) Sheet http://www.zayo.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.zayo.com/role/DisclosureIncomeTaxes 27 false false R28.htm 30803 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.zayo.com/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.zayo.com/role/DisclosureStockBasedCompensation 28 false false R29.htm 30903 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.zayo.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.zayo.com/role/DisclosureFairValueMeasurements 29 false false R30.htm 31103 - Disclosure - Related Party Transactions (Tables) Sheet http://www.zayo.com/role/DisclosureRelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://www.zayo.com/role/DisclosureRelatedPartyTransactions 30 false false R31.htm 31203 - Disclosure - Segment Reporting (Tables) Sheet http://www.zayo.com/role/DisclosureSegmentReportingTables Segment Reporting (Tables) Tables http://www.zayo.com/role/DisclosureSegmentReporting 31 false false R32.htm 31303 - Disclosure - Condensed Consolidating Financial Information (Tables) Sheet http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationTables Condensed Consolidating Financial Information (Tables) Tables http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformation 32 false false R33.htm 40201 - Disclosure - Acquisitions (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureAcquisitionsNarrativeDetails Acquisitions (Narrative) (Details) Details http://www.zayo.com/role/DisclosureAcquisitionsTables 33 false false R34.htm 40202 - Disclosure - Acquisitions (Schedule of Acquisition) (Details) Sheet http://www.zayo.com/role/DisclosureAcquisitionsScheduleOfAcquisitionDetails Acquisitions (Schedule of Acquisition) (Details) Details http://www.zayo.com/role/DisclosureAcquisitionsTables 34 false false R35.htm 40203 - Disclosure - Acquisitions (Schedule of Pro-Forma Financial Information) (Details) Sheet http://www.zayo.com/role/DisclosureAcquisitionsScheduleOfProFormaFinancialInformationDetails Acquisitions (Schedule of Pro-Forma Financial Information) (Details) Details http://www.zayo.com/role/DisclosureAcquisitionsTables 35 false false R36.htm 40301 - Disclosure - Goodwill (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureGoodwillNarrativeDetails Goodwill (Narrative) (Details) Details http://www.zayo.com/role/DisclosureGoodwillTables 36 false false R37.htm 40302 - Disclosure - Goodwill (Schedule Of Goodwill) (Details) Sheet http://www.zayo.com/role/DisclosureGoodwillScheduleOfGoodwillDetails Goodwill (Schedule Of Goodwill) (Details) Details http://www.zayo.com/role/DisclosureGoodwillTables 37 false false R38.htm 40401 - Disclosure - Intangible Assets (Schedule of Identifiable Acquisition Related Intangible Assets) (Details) Sheet http://www.zayo.com/role/DisclosureIntangibleAssetsScheduleOfIdentifiableAcquisitionRelatedIntangibleAssetsDetails Intangible Assets (Schedule of Identifiable Acquisition Related Intangible Assets) (Details) Details http://www.zayo.com/role/DisclosureIntangibleAssetsTables 38 false false R39.htm 40501 - Disclosure - Long-Term Debt (Summary of Long-Term Debt) (Details) Sheet http://www.zayo.com/role/DisclosureLongTermDebtSummaryOfLongTermDebtDetails Long-Term Debt (Summary of Long-Term Debt) (Details) Details http://www.zayo.com/role/DisclosureLongTermDebtTables 39 false false R40.htm 40502 - Disclosure - Long-Term Debt (Interest Rates and Maturities) (Details) Sheet http://www.zayo.com/role/DisclosureLongTermDebtInterestRatesAndMaturitiesDetails Long-Term Debt (Interest Rates and Maturities) (Details) Details http://www.zayo.com/role/DisclosureLongTermDebtTables 40 false false R41.htm 40503 - Disclosure - Long-Term Debt (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureLongTermDebtNarrativeDetails Long-Term Debt (Narrative) (Details) Details http://www.zayo.com/role/DisclosureLongTermDebtTables 41 false false R42.htm 40601 - Disclosure - Income Taxes (Summary of (Benefit)/Provision for Income Taxes from Continuing Operations) (Details) Sheet http://www.zayo.com/role/DisclosureIncomeTaxesSummaryOfBenefitProvisionForIncomeTaxesFromContinuingOperationsDetails Income Taxes (Summary of (Benefit)/Provision for Income Taxes from Continuing Operations) (Details) Details http://www.zayo.com/role/DisclosureIncomeTaxesTables 42 false false R43.htm 40602 - Disclosure - Income Taxes (Income/(Loss) from Continuing Operations Before Income Tax) (Details) Sheet http://www.zayo.com/role/DisclosureIncomeTaxesIncomeLossFromContinuingOperationsBeforeIncomeTaxDetails Income Taxes (Income/(Loss) from Continuing Operations Before Income Tax) (Details) Details http://www.zayo.com/role/DisclosureIncomeTaxesTables 43 false false R44.htm 40603 - Disclosure - Income Taxes (Reconciliations of Actual Income Tax Provision and Tax Computed by Applying United States Federal Rate to Earnings Before Income Taxes) (Details) Sheet http://www.zayo.com/role/DisclosureIncomeTaxesReconciliationsOfActualIncomeTaxProvisionAndTaxComputedByApplyingUnitedStatesFederalRateToEarningsBeforeIncomeTaxesDetails Income Taxes (Reconciliations of Actual Income Tax Provision and Tax Computed by Applying United States Federal Rate to Earnings Before Income Taxes) (Details) Details http://www.zayo.com/role/DisclosureIncomeTaxesTables 44 false false R45.htm 40701 - Disclosure - Equity (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureEquityNarrativeDetails Equity (Narrative) (Details) Details http://www.zayo.com/role/DisclosureEquity 45 false false R46.htm 40801 - Disclosure - Stock-Based Compensation (Summary of Stock-based Compensation Expense Liability and Equity Classified Awards Included in Consolidated Statements of Operations) (Details) Sheet http://www.zayo.com/role/DisclosureStockBasedCompensationSummaryOfStockBasedCompensationExpenseLiabilityAndEquityClassifiedAwardsIncludedInConsolidatedStatementsOfOperationsDetails Stock-Based Compensation (Summary of Stock-based Compensation Expense Liability and Equity Classified Awards Included in Consolidated Statements of Operations) (Details) Details http://www.zayo.com/role/DisclosureStockBasedCompensationTables 46 false false R47.htm 40802 - Disclosure - Stock-Based Compensation (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureStockBasedCompensationNarrativeDetails Stock-Based Compensation (Narrative) (Details) Details http://www.zayo.com/role/DisclosureStockBasedCompensationTables 47 false false R48.htm 40803 - Disclosure - Stock-Based Compensation (Summary Of Restricted Stock Units Activity) (Details) Sheet http://www.zayo.com/role/DisclosureStockBasedCompensationSummaryOfRestrictedStockUnitsActivityDetails Stock-Based Compensation (Summary Of Restricted Stock Units Activity) (Details) Details http://www.zayo.com/role/DisclosureStockBasedCompensationTables 48 false false R49.htm 40804 - Disclosure - Stock-Based Compensation (Summary Of Part B RSUs Granted, Maximum Eligible Shares Of Stock And Grant Date Fair Value Per Part B RSU) (Details) Sheet http://www.zayo.com/role/DisclosureStockBasedCompensationSummaryOfPartBRsusGrantedMaximumEligibleSharesOfStockAndGrantDateFairValuePerPartBRsuDetails Stock-Based Compensation (Summary Of Part B RSUs Granted, Maximum Eligible Shares Of Stock And Grant Date Fair Value Per Part B RSU) (Details) Details http://www.zayo.com/role/DisclosureStockBasedCompensationTables 49 false false R50.htm 40901 - Disclosure - Fair Value Measurements (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureFairValueMeasurementsNarrativeDetails Fair Value Measurements (Narrative) (Details) Details http://www.zayo.com/role/DisclosureFairValueMeasurementsTables 50 false false R51.htm 40902 - Disclosure - Fair Value Measurements (Schedule Of Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) Sheet http://www.zayo.com/role/DisclosureFairValueMeasurementsScheduleOfFinancialInstrumentsMeasuredAtFairValueOnRecurringBasisDetails Fair Value Measurements (Schedule Of Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) Details http://www.zayo.com/role/DisclosureFairValueMeasurementsTables 51 false false R52.htm 41002 - Disclosure - Commitments and Contingencies (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails Commitments and Contingencies (Narrative) (Details) Details http://www.zayo.com/role/DisclosureCommitmentsAndContingencies 52 false false R53.htm 41101 - Disclosure - Related Party Transactions (Schedule of Revenue and Expense Transactions) (Details) Sheet http://www.zayo.com/role/DisclosureRelatedPartyTransactionsScheduleOfRevenueAndExpenseTransactionsDetails Related Party Transactions (Schedule of Revenue and Expense Transactions) (Details) Details http://www.zayo.com/role/DisclosureRelatedPartyTransactionsTables 53 false false R54.htm 41102 - Disclosure - Related Party Transactions (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureRelatedPartyTransactionsNarrativeDetails Related Party Transactions (Narrative) (Details) Details http://www.zayo.com/role/DisclosureRelatedPartyTransactionsTables 54 false false R55.htm 41201 - Disclosure - Segment Reporting (Summary of Financial Information by Segments) (Details) Sheet http://www.zayo.com/role/DisclosureSegmentReportingSummaryOfFinancialInformationBySegmentsDetails Segment Reporting (Summary of Financial Information by Segments) (Details) Details http://www.zayo.com/role/DisclosureSegmentReportingTables 55 false false R56.htm 41202 - Disclosure - Segment Reporting (Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations) (Details) Sheet http://www.zayo.com/role/DisclosureSegmentReportingReconciliationFromSegmentAdjustedEbitdaToNetLossFromContinuingOperationsDetails Segment Reporting (Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations) (Details) Details http://www.zayo.com/role/DisclosureSegmentReportingTables 56 false false R57.htm 41301 - Disclosure - Condensed Consolidating Financial Information (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationNarrativeDetails Condensed Consolidating Financial Information (Narrative) (Details) Details http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationTables 57 false false R58.htm 41302 - Disclosure - Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Details) Sheet http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationScheduleOfCondensedConsolidatingBalanceSheetDetails Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Details) Details http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationTables 58 false false R59.htm 41303 - Disclosure - Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Operations) (Details) Sheet http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationScheduleOfCondensedConsolidatingStatementsOfOperationsDetails Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Operations) (Details) Details http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationTables 59 false false R60.htm 41304 - Disclosure - Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) Sheet http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationScheduleOfCondensedConsolidatingStatementsOfCashFlowsDetails Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) Details http://www.zayo.com/role/DisclosureCondensedConsolidatingFinancialInformationTables 60 false false R61.htm 41401 - Disclosure - Subsequent Events (Narrative) (Details) Sheet http://www.zayo.com/role/DisclosureSubsequentEventsNarrativeDetails Subsequent Events (Narrative) (Details) Details http://www.zayo.com/role/DisclosureSubsequentEvents 61 false false All Reports Book All Reports zgi-20151231.xml zgi-20151231.xsd zgi-20151231_cal.xml zgi-20151231_def.xml zgi-20151231_lab.xml zgi-20151231_pre.xml true true