Zayo 10-Q 8 Nov 18 2019 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Sep. 30, 2018shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q1
Entity Registrant Name	ZAYO GROUP LLC
Entity Central Index Key	1,502,756
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding	0

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017
Current assets
Cash and cash equivalents	$ 353.2	$ 256	$ 290.5	$ 220
Trade receivables, net of allowance of $11.2 and $11.1 as of September 30, 2018 and June 30, 2018, respectively	227.2	235.6
Prepaid expenses	68.2	74.1
Other current assets	27.7	25.8
Assets held for sale		41.8
Total current assets	676.3	633.3
Property and equipment, net	5,524.7	5,427.6
Intangible assets, net	1,192.5	1,212.1
Goodwill	1,710.2	1,719.1
Deferred income taxes, net	36.2	37.6
Other assets	170.4	175.6
Total assets	9,310.3	9,205.3
Current liabilities
Accounts payable	41.9	45.9
Accrued liabilities	314.2	315.1
Accrued interest	85.4	72.6
Current portion of long-term debt	5	5
Capital lease obligations, current	10.5	11.9
Deferred revenue, current	171.6	162.9
Liabilities associated with assets held for sale		6.1
Total current liabilities	628.6	619.5
Long-term debt, non-current	5,691.3	5,690.1
Capital lease obligation, non-current	142.9	121.6
Deferred revenue, non-current	1,085.6	1,076.3
Deferred income taxes, net	167.5	152.4
Other long-term liabilities	52.3	57.8
Total liabilities	7,768.2	7,717.7
Member's Equity
Member's interest	1,902.7	1,876.6
Accumulated other comprehensive loss	(9.2)	(15.5)
Accumulated deficit	(351.4)	(373.5)
Total member's equity	1,542.1	1,487.6
Total liabilities and member's equity	$ 9,310.3	$ 9,205.3

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Statement Of Financial Position [Abstract]
Trade receivables allowance	$ 11.2	$ 11.1

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 641.1	$ 643.1
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation—Note 9)	228.4	235.7
Selling, general and administrative expenses (including stock-based compensation—Note 9)	122.1	128.1
Depreciation and amortization	167.8	183.8
Total operating costs and expenses	518.3	547.6
Operating income	122.8	95.5
Other expenses
Interest expense	(82.2)	(73.6)
Loss on extinguishment of debt		(4.9)
Foreign currency (loss)/gain on intercompany loans	(4.6)	10.8
Other income/(expense), net	6.6	0.9
Total other expenses, net	(80.2)	(66.8)
Income from operations before income taxes	42.6	28.7
Provision for income taxes	20.5	5.4
Net income	$ 22.1	$ 23.3

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Comprehensive Income Net Of Tax [Abstract]
Net income	$ 22.1	$ 23.3
Foreign currency translation adjustments, net of tax	8.2	22.1
Defined benefit pension plan adjustments	(1.9)
Comprehensive income	$ 28.4	$ 45.4

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF MEMBER’S EQUITY - 3 months ended Sep. 30, 2018 - USD ($) $ in Millions	Member's Interest [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]	Accumulated Deficit [Member]	Total
Balance at Jun. 30, 2018	$ 1,876.6	$ (15.5)	$ (373.5)	$ 1,487.6
Stock-based compensation	26.3			26.3
Foreign currency translation adjustment		8.2		8.2
Capital distribution to parent	(0.2)			(0.2)
Defined benefit pension plan adjustments		(1.9)		(1.9)
Net income			22.1	22.1
Balance at Sep. 30, 2018	$ 1,902.7	$ (9.2)	$ (351.4)	$ 1,542.1

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 22.1	$ 23.3
Adjustments to reconcile net income/(loss) to net cash provided by operating activities
Depreciation and amortization	167.8	183.8
Loss on extinguishment of debt		(4.9)
Gain on sale of SRT	(5.5)
Non-cash interest expense	2.5	2.4
Stock-based compensation	26.7	27.8
Amortization of deferred revenue	(37)	(32.4)
Foreign currency loss / (gain) on intercompany loans	4.6	(10.8)
Deferred income taxes	15.9	2.7
Provision for bad debts	1.5	0.8
Non-cash loss on investments	0.3	0.1
Changes in operating assets and liabilities, net of acquisitions
Trade receivables	4.5	(32)
Accounts payable and accrued liabilities	9	53.4
Additions to deferred revenue	30.5	40.5
Other assets and liabilities	(1.1)	4.3
Net cash provided by operating activities	241.8	268.8
Cash flows from investing activities
Purchases of property and equipment	(182.5)	(193.4)
Proceeds from sale of SRT, net of cash held in escrow	39
Net cash used in investing activities	(143.5)	(193.4)
Cash flows from financing activities
Proceeds from debt		312.8
Principal payments on long-term debt	(1.3)	(311.9)
Principal payments on capital lease obligations	(1.9)	(1.7)
Payment of debt issue costs		(3.4)
Payments to repurchase ZGH common stock	(0.2)
Cash paid for Santa Clara acquisition financing arrangement and other	(3.3)	(1.3)
Net cash used in financing activities	(6.7)	(5.5)
Net cash flows	91.6	69.9
Effect of changes in foreign exchange rates on cash	2.2	0.6
Net increase/(decrease) in cash and cash equivalents	93.8	70.5
Cash, cash equivalents and restricted cash, beginning of year	260.6	224.5
Cash, cash equivalents and restricted cash, end of period	354.4	295
Supplemental disclosure of non-cash investing and financing activities:
Cash paid for interest, net of capitalized interest	63.4	54.3
Cash paid for income taxes	2	1.4
Non-cash purchases of equipment through capital leasing	21.9	0.1
Non-cash purchases of equipment through nonmonetary exchange	31.1	1.5
(Decrease)/increase in accounts payable and accrued expenses for purchases of property and equipment	(2.4)	(18)
Total cash, cash equivalents and restricted cash	$ 260.6	$ 224.5

BUSINESS AND BASIS OF PRESENTAT

BUSINESS AND BASIS OF PRESENTATION	3 Months Ended
	Sep. 30, 2018
BUSINESS AND BASIS OF PRESENTATION
BUSINESS AND BASIS OF PRESENTATION	(1) BUSINESS AND BASIS OF PRESENTATION Business Zayo Group, LLC, a Delaware limited liability company, was formed on May 4, 2007, and is the operating parent company of a number of subsidiaries engaged in providing access to bandwidth infrastructure. Zayo Group LLC and its subsidiaries are collectively referred to as “Zayo Group” or the “Company.” Headquartered in Boulder, Colorado, the Company provides communication infrastructure solutions, including fiber and bandwidth connectivity, colocation and cloud infrastructure, to businesses primarily in the United States (“U.S.”), Canada and Europe. The Company provides its products and offerings through six segments: · Fiber Solutions, including dark fiber and mobile infrastructure solutions. · Transport, including Ethernet, wavelength, wholesale IP, and SONET solutions. · Enterprise Networks, including private lines, dedicated Internet and cloud-based computing and storage products. · Colocation, including provision of colocation space and power and interconnection offerings. · Allstream, including Cloud VoIP and Data Solutions. · Other offerings, including Zayo Professional Services. On May 3, 2018, the Company announced that it completed the first phase of its investigation on the advisability and feasibility of a conversion of Zayo Group Holdings Inc. (“ZGH”) to a real estate investment trust for U.S. federal income tax purposes (a “REIT”). The Company has begun the next phase of its evaluation and preparation for a potential conversion of ZGH to a REIT. As part of these efforts, the Company has begun a direct dialogue with the U.S. Internal Revenue Service (“IRS”) in an effort to obtain clarity and support for its position, and ZGH is seeking a private letter ruling (“PLR”) from the IRS. The ability of ZGH to qualify for taxation as a REIT will depend upon its continuing compliance following REIT conversion with various requirements, including requirements related to the nature of its assets, the sources of its income and the distributions to its stockholders. ZGH is requesting that the PLR address whether ZGH’s revenues from dark and lit fiber satisfy applicable REIT income tests, and ZGH’s ultimate decision to convert to a REIT may depend upon a favorable ruling from the IRS on this topic. ZGH submitted a PLR request to the IRS in July 2018, but the IRS may not provide a response until 2019 or later or may not respond at all. Basis of Presentation The accompanying condensed consolidated financial statements include all the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated in consolidation. The accompanying condensed consolidated financial statements and related notes are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q, and do not include all of the note disclosures required by GAAP for complete financial statements. These condensed consolidated financial statements should, therefore, be read in conjunction with the consolidated financial statements and notes thereto for the year ended June 30, 2018 included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2018. In the opinion of management, all adjustments considered necessary for the fair presentation of financial position, results of operations and cash flows of the Company have been included herein. The results of operations for the three months ended September 30, 2018 are not necessarily indicative of the operating results for any future interim period or the full year. Unless otherwise noted, dollar amounts and disclosures throughout the Notes to the condensed consolidated financial statements are presented in millions of dollars. The Company’s fiscal year ends June 30 each year, and we refer to the fiscal year ending June 30, 2019 as “Fiscal 2019” and the fiscal year ended June 30, 2018 as “Fiscal 2018.” Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Estimates are used when establishing allowances for doubtful accounts and accruals for billing disputes, determining useful lives for depreciation and amortization and accruals for exit activities associated with real estate leases, assessing the need for impairment charges (including those related to intangible assets and goodwill), determining the fair values of assets acquired and liabilities assumed in business combinations, accounting for income taxes and related valuation allowances against deferred tax assets, determining the defined benefit costs and defined benefit obligations related to post-employment benefits, determining the fair value of plan assets related to post-employment benefits and estimating certain restricted stock unit grant fair values used to compute the stock-based compensation liability and expense. Management evaluates these estimates and judgments on an ongoing basis and makes estimates based on historical experience, current conditions, and various other assumptions that are believed to be reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from these estimates under different assumptions or conditions. Significant Accounting Policies On July 1, 2018, the Company adopted the requirements of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers . See “ Recently Adopted Accounting Pronouncements” and Note 13 – Revenue and Contract Costs for additional disclosure on our adoption of ASC 606 and its impact on the condensed consolidated financial statements. There have been no other changes to the Company’s significant accounting policies described in its Annual Report on Form 10-K for the year ended June 30, 2018. Recently Issued Accounting Pronouncements In February 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income , which allows companies to reclassify the income tax effects resulting from tax bill, H.R.1, from accumulated other comprehensive income to retained earnings. The standard also requires certain new disclosures regardless of the election. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 (fiscal year ending June 30, 2020 “Fiscal 2020” for the Company), with early adoption permitted. In February 2016, the FASB issued ASU 2016-02, Leases . The new guidance supersedes existing guidance on accounting for leases in Topic 840 and is intended to increase the transparency and comparability of accounting for lease transactions. ASU 2016-02 requires most leases to be recognized on the balance sheet. Lessees will need to recognize a right-of-use asset and a lease liability for virtually all leases. The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Lessor accounting remains similar to the current model, but updated to align with certain changes to the lessee model and the new revenue recognition standard (ASU 2014-09). The ASU will require both quantitative and qualitative disclosures regarding key information about leasing arrangements. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 (Fiscal 2020 for the Company). Early adoption is permitted. The standard will require application of the new guidance at the beginning of the earliest comparative period presented using a modified retrospective transition, and provides for certain practical expedients. The Company established a project team and commenced an initial impact assessment process. To date, the Company has reviewed a sample of lessee and lessor arrangements and made preliminary assessments of the impact this standard will have on the consolidated financial statements. Although it is still assessing the impact of this standard, the Company expects the new guidance to significantly increase the reported assets and liabilities on the consolidated balance sheets. There are currently no plans to early adopt ASU 2016-02. Recently Adopted Accounting Pronouncements In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . This ASU requires an employer to report the service cost component of net periodic pension cost and net periodic postretirement cost in the same line item in the statement of operations as other compensation costs arising from services rendered by the related employees during the period. The other net cost components are required to be presented in the statement of operations separately from the service cost component and outside a subtotal of income from operations. Additionally, the line item used in the statement of operations to present the other net cost components must be disclosed in the notes to the financial statements. This ASU is effective for fiscal years beginning after December 15, 2017 (Fiscal 2019 for the Company), and interim periods within those fiscal years, and must be applied on a retrospective basis. The adoption did not result in a material impact to the condensed consolidated financial statements for either of the three months ended September 30, 2018 or 2017 and retrospective application was applied. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash . The new standard requires a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 (Fiscal 2019 for the Company). The retrospective adoption of this accounting standard did not have a material impact on its condensed consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classifications of Certain Cash Receipts and Cash Payments. The new standard provides guidance for eight changes with respect to how cash receipts and cash payments are classified in the statement of cash flows, with the objective of reducing diversity in practice. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2017 (Fiscal 2019 for the Company) . The retrospective adoption of this accounting standard did not have a material impact on its condensed consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASC 606”), which replaces numerous requirements in U.S. GAAP, including industry-specific requirements, and provides companies with a single revenue recognition model for recognizing revenue from certain contracts with customers. The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers and addressed accounting for costs to acquire and fulfill contracts. The standard does not impact the manner in which the Company accounts for revenue arrangements accounted for as leases. Effective July 1, 2018, the Company adopted the requirements of ASC 606 and used the full retrospective transition method. The full retrospective transition method requires the Company to restate each prior reporting period presented. The Company has implemented internal controls and system functionality to enable the preparation of financial information in accordance with ASC 606. The adoption of ASC 606 has an impact on the manner in which the Company recognizes revenue associated with dark fiber sales that include the transfer of title to certain network assets, which prior to ASC 606 was considered a sale of real estate or integral equipment. Under previous GAAP, the Company deferred the recognition of revenue on the sale of network infrastructure assets that were considered to be integral equipment if the Company had a substantial continuing involvement in the transferred asset. The consideration received in this type of arrangement had historically been amortized to revenue ratably over the period in which the Company had a substantial continuing involvement in the transferred asset. Under ASC 606 the asset transferred in this type of arrangement is derecognized from the balance sheet and the amount of the transaction price attributable to the asset being sold is recognized upon customer acceptance. This change had an impact of (decreasing)/increasing the revenue previously reported by the Company during the years ended June 30, 2018 and 2017 by ($1.5) million and $20.5 million, respectively. The full retrospective adoption of ASC 606 also resulted in increasing the previously reported operating costs during the year ended June 30, 2017 by $18.8 million, which represents the net book value of assets transferred to customers in these types of arrangements during Fiscal 2017. The assets transferred in these real estate sales had historically been included in property and equipment, net on the Company’s balance sheet. Upon the adoption of ASC 606, the net book value of these assets of $19.6 million was removed from the Company’s condensed consolidated balance sheet. The Company also derecognized from its June 30, 2018 balance sheet $1.5 million and $20.5 million in related deferred revenue, current and non-current, respectively, which represented the unamortized consideration received on these arrangements. An additional impact from the adoption of ASC 606 is the accounting for the incremental costs of acquiring new service contracts, including certain compensation expense with internal sales representatives. Under ASC 606, the Company capitalizes these incremental costs of obtaining customer contracts and amortizes the expense over the relevant contract term. In addition, the Company will assess its deferred contract cost asset for impairment on a periodic basis. Prior to the adoption of ASC 606, compensation paid to internal sales representatives for obtaining new service contracts was expensed as incurred. The impact of the retrospective adoption of ASC 606 resulted in an increase to selling, general and administrative expenses as previously reported by the Company during the years ended June 30, 2018 and 2017 by $1.1 million and $0.2 million, respectively. Additionally, the Company recorded an increase to the previously reported other current assets and other assets on the consolidated balance sheet as of June 30, 2018 of $7.1 million and $5.6 million, respectively, to reflect the deferred cost of acquiring service contracts that will be recognized in future periods over the relevant contract term. The table below presents the impact the full retrospective adoption of ASC 606 had on the Company’s condensed statement of operations for the years ended June 30, 2018 and 2017 and each of the quarters of Fiscal 2018: Fiscal Year ended Quarter Ended (unaudited) June 30, June 30, September 30, December 31, March 31, June 30, (in millions) Revenue $ (1.5) $ 20.5 $ (0.4) $ (0.4) $ (0.4) $ (0.3) Operating costs — 18.8 — — — — Selling, general and administrative expenses 1.1 0.2 (0.2) 0.6 (0.3) 1.0 Depreciation and amortization (0.9) (0.7) (0.3) (0.3) (0.2) (0.1) Provision for income taxes (2.7) 0.8 — (2.5) — (0.2) Net income 1.0 1.4 0.1 1.8 0.1 (1.0) The table below presents the impact the full retrospective adoption of ASC 606 had on the Company’s consolidated balance sheet for the year ended June 30, 2018: As of June 30, 2018 As Previously Reported Effect of Adoption As Adjusted (in millions) Assets Other current assets $ 18.7 $ 7.1 $ 25.8 Property and equipment, net $ 5,447.2 $ (19.6) $ 5,427.6 Other assets $ 170.0 $ 5.6 $ 175.6 Liabilities Deferred revenue, current $ 164.4 $ (1.5) $ 162.9 Deferred revenue, non-current $ 1,096.8 $ (20.5) $ 1,076.3 Deferred income taxes, net $ 148.5 $ 3.9 $ 152.4 Stockholders' equity Accumulated deficit $ (384.7) $ 11.2 $ (373.5)

ACQUISITIONS AND DISPOSITIONS

ACQUISITIONS AND DISPOSITIONS	3 Months Ended
	Sep. 30, 2018
ACQUISITIONS AND DISPOSITIONS
ACQUISITIONS AND DISPOSITIONS	(2) ACQUISITIONS AND DISPOSITIONS Since inception through September 30, 2018, the Company has consummated 45 transactions accounted for as business combinations. The acquisitions were executed as part of the Company’s business strategy of expanding through acquisitions. The acquisitions of these businesses have allowed the Company to increase the scale at which it operates, which in turn affords the Company the ability to increase its operating leverage, extend its network reach, and broaden its customer base. The accompanying condensed consolidated financial statements include the operations of the acquired entities from their respective acquisition dates. Acquisitions Completed During Fiscal 2018 Neutral Path Communications On April 17, 2018, the Company acquired substantially all of the assets of Neutral Path Communications and Near North Partners (collectively, “Neutral Path”) for $33.3 million, which is net of cash acquired and also included an estimate for a contingent payment based on sales performance through June 30, 2018. The purchase price is subject to net working capital and certain post-closing adjustments. As of September 30, 2018, $4.0 million of the purchase consideration is being held in escrow pending the expiration of the indemnification adjustment period. The all-cash acquisition was funded with cash on hand and was considered an asset purchase for U.S. federal income tax purposes. Neutral Path is a long haul infrastructure provider, providing access to a fiber network section in the Midwest. The transaction added owned plus additional leased route miles to the Company’s extensive North American network, including a unique high-count fiber route from Minneapolis to Omaha. McLean Data Center On April 4, 2018, the Company acquired McLean Data Center, a privately owned data center for an insignificant amount. The acquisition was considered an asset purchase for U.S. federal income tax purposes and a business combination for accounting purposes. The Company assumed an operating lease obligation and acquired certain assets, such as cash, structural components, equipment, and assumed customer contracts. Spread Networks On February 28, 2018, the Company acquired Spread Networks, LLC (“Spread Networks”), a privately owned telecommunications provider that owns and offers access to a high-fiber count long haul route connecting New York and Chicago, for net purchase consideration of $130.5 million, net of cash acquired, subject to certain post-closing adjustments. As of September 30, 2018, $0.6 million of the purchase consideration is being held in escrow pending the expiration of the indemnification adjustment period. The all-cash acquisition was funded with cash on hand and debt and was considered an asset purchase for U.S. federal income tax purposes. Additional connectivity of the route will be enabled by Zayo’s existing network. Optic Zoo Networks On January 18, 2018, the Company acquired Vancouver, BC Canada-based Optic Zoo Networks for net purchase consideration of CAD $30.9 million (or $24.8 million), net of cash acquired, subject to certain post-closing adjustments. Optic Zoo Networks owns and provides access to high-capacity fiber in Vancouver, BC. As of September 30, 2018, CAD $3.2 million (or $ 2.5 million) of the purchase consideration is being held in escrow pending the expiration of the indemnification adjustment period. The acquisition was funded with cash on hand and was considered a stock purchase for U.S. federal income tax purposes. Acquisition Method Accounting Estimates The Company initially recognizes the assets and liabilities acquired from the aforementioned acquisitions based on its preliminary estimates of their acquisition date fair values. As additional information becomes known concerning the acquired assets and assumed liabilities, management may make adjustments to the opening balance sheet of the acquired company up to the end of the measurement period, which is no longer than a one year period following the acquisition date. The determination of the fair values of the acquired assets and liabilities assumed (and the related determination of estimated lives of depreciable tangible and identifiable intangible assets) requires significant judgment. As of September 30, 2018 , for the Optic Zoo Networks, Spread Networks, McLean Data Center and Neutral Path acquisitions, the Company has not completed its fair value analysis and calculations in sufficient detail necessary to arrive at the final estimates of the fair value of certain working capital and non-working capital acquired assets and assumed liabilities, including the allocations to goodwill and intangible assets, property and equipment and resulting deferred taxes. For the Spread Networks acquisition, the items with the highest likelihood of change are working capital related accounts, property and equipment and goodwill. All information presented with respect to certain working capital and non-working capital acquired assets and liabilities assumed as it relates to these acquisitions is preliminary and subject to revision pending the final fair value determination . As a result of integrated reporting, it is impracticable to determine the amount of revenue and net income associated with each acquisition recognized in the post-acquisition period. The table below reflects the Company's estimates of the acquisition date fair values of the assets acquired and liabilities assumed from its Fiscal 2018 acquisitions: Neutral Path McLean Data Center Spread Networks Optic Zoo Networks Acquisition date April 17, 2018 April 4, 2018 February 28, 2018 January 18, 2018 (in millions) Cash $ 0.7 $ 9.2 $ 1.5 $ 1.4 Other current assets 0.2 — 4.2 0.4 Property and equipment 15.2 0.6 143.7 13.6 Intangibles 6.9 — 9.3 3.8 Goodwill 15.9 — 14.4 9.9 Deferred tax assets 1.5 — 7.1 — Other assets — — 1.4 0.2 Total assets acquired 40.4 9.8 181.6 29.3 Current liabilities 0.6 1.6 2.6 0.6 Deferred revenue 5.8 — 27.2 1.2 Deferred tax liability, net — — — 1.3 Other liabilities — 8.2 19.8 — Total liabilities assumed 6.4 9.8 49.6 3.1 Net assets acquired 34.0 — 132.0 26.2 Less cash acquired (0.7) (9.2) (1.5) (1.4) Net consideration paid $ 33.3 $ (9.2) $ 130.5 $ 24.8 The goodwill arising from the Company’s acquisitions results from synergies, anticipated incremental sales to the acquired company customer base and economies-of-scale expected from the acquisitions. The Company has allocated the goodwill to the reporting units (in existence on the respective acquisition dates) that were expected to benefit from the acquired goodwill. The allocation was determined based on the excess of the estimated fair value of the reporting unit over the estimated fair value of the individual assets acquired and liabilities assumed that were assigned to the reporting units. See Note 3 – Goodwill for the allocation of the Company's acquired goodwill to each of its reporting units. In the Company’s acquisitions, the Company acquired certain customer relationships. These relationships represent a valuable intangible asset, as the Company anticipates continued business from the acquired customer bases. The Company’s estimate of the fair value of the acquired customer relationships is generally based on a multi-period excess earnings valuation technique that utilizes Level 3 inputs . Transaction Costs Transaction costs include expenses associated with professional services (i.e., legal, accounting, regulatory, etc.) rendered in connection with signed and/or closed acquisitions or disposals, travel expense, severance expense incurred associated with acquisitions or disposals, and other direct expenses incurred that are associated with signed and/or closed acquisitions or disposals and unsuccessful acquisitions. The Company incurred transaction costs of $0.7 million and $ 8.3 million for the three months ended September 30, 2018 and 2017, respectively. Transaction costs have been included in selling, general and administrative expenses in the condensed consolidated statements of operations and in cash flows from operating activities in the condensed consolidated statements of cash flows during these periods. Scott-Rice Telephone Co. On July 31, 2018, the Company completed the sale of Scott-Rice Telephone Co. (“SRT”), a Minnesota incumbent local exchange carrier, for $42.2 million to Nuvera Communications, Inc. (formerly New Ulm Telecom, Inc.). As of September 30, 2018, $3.2 million of purchase consideration was held in escrow. The Company recognized a pre-tax gain of $5.5 million on the sale, which is included in other income, net in the condensed consolidated statements of operations. The Company acquired SRT as part of its March 1, 2017 purchase of Electric Lightwave Parent, Inc. and it was included as part of the Allstream segment. SRT had a pre-tax net loss of $1.6 million for the year ended June 30, 2018 and pre-tax net income of $2.9 million from when it was acquired in March 1, 2017 through June 30, 2017. SRT qualified as held-for-sale as of March 31, 2018 and was classified as held-for-sale in the Company’s June 30, 2018 balance sheet. The Company concluded that SRT was not a significant disposal group and did not represent a strategic shift, and therefore was not classified as discontinued operations. The following tables summarize the net assets and liabilities held for sale as of June 30, 2018: June 30, 2018 (in millions) Assets held for sale: Property and equipment, net $ 35.7 Goodwill 5.2 Other assets 0.9 Total assets held for sale $ 41.8 Liabilities associated with assets held for sale: Deferred tax liability, net $ 5.1 Other liabilities 1.0 Total liabilities associated with assets held for sale $ 6.1

GOODWILL

GOODWILL	3 Months Ended
	Sep. 30, 2018
GOODWILL
GOODWILL	(3) GOODWILL The Company’s goodwill balance was $1,710.2 million and $1,719.1 million as of September 30, 2018 and June 30, 2018, respectively. The Company’s reporting units are comprised of its strategic product groups (“SPG” or “SPGs”). Effective April 1, 2018, the Company implemented further organizational changes by creating two new reporting units: CloudLink Solutions (“CloudLink”) and Live Video Solutions (“Live Video”). In connection with the organizational change, goodwill was re-allocated to the Company’s SPGs on a relative fair value basis. The Company completed an assessment immediately prior to and after the organizational change at the SPG level and determined that it is more likely than not that the fair value of the Company’s reporting units is greater than their carrying amounts. As of September 30, 2018, the Company’s SPGs were comprised of the following: Fiber Solutions, Zayo Wavelength Solutions (“Waves”), Zayo SONET Solutions (“SONET”), Zayo Ethernet Solutions (“Ethernet”), Live Video, Wide Area Networks (“WANs”, formerly Enterprise Private and Connectivity), Zayo Cloud Solutions (“Cloud”), Zayo Colocation (“zColo”), CloudLink, Allstream, and Other (primarily Zayo Professional Services). The following reflects the changes in the carrying amount of goodwill during the three months ended September 30, 2018: Product Group As of June 30, 2018 Adjustments to Fiscal 2018 Foreign Currency As of September 30, 2018 (in millions) Fiber Solutions $ 756.4 $ (6.1) $ (0.9) $ 749.4 Waves 194.8 (0.9) (0.8) 193.1 Sonet 87.6 — — 87.6 Ethernet 104.2 (0.2) — 104.0 Live Video 3.3 — — 3.3 WANs 179.3 — 0.1 179.4 zColo 260.1 — (0.1) 260.0 Cloud 65.3 — — 65.3 Cloudlink 13.5 — — 13.5 Allstream 39.0 — — 39.0 Other 15.6 — — 15.6 Total $ 1,719.1 $ (7.2) $ (1.7) $ 1,710.2

INTANGIBLE ASSETS

INTANGIBLE ASSETS	3 Months Ended
	Sep. 30, 2018
INTANGIBLE ASSETS
INTANGIBLE ASSETS	(4) INTANGIBLE ASSETS Identifiable intangible assets as of September 30, 2018 and June 30, 2018 were as follows: Gross Carrying Amount Accumulated Net (in millions) September 30, 2018 Finite-Lived Intangible Assets Customer relationships $ 1,600.9 $ (429.3) $ 1,171.6 Underlying rights and other 3.4 (0.9) 2.5 Total 1,604.3 (430.2) 1,174.1 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying rights and other 14.9 — 14.9 Total $ 1,622.7 $ (430.2) $ 1,192.5 June 30, 2018 Finite-Lived Intangible Assets Customer relationships $ 1,597.0 $ (405.6) $ 1,191.4 Underlying rights and other 2.7 (0.6) 2.1 Total 1,599.7 (406.2) 1,193.5 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying rights and other 15.1 — 15.1 Total $ 1,618.3 $ (406.2) $ 1,212.1

LONG-TERM DEBT

LONG-TERM DEBT	3 Months Ended
	Sep. 30, 2018
LONG-TERM DEBT
LONG-TERM DEBT	(5) LONG-TERM DEBT As of September 30, 2018 and June 30, 2018, long-term debt was as follows: Date of Outstanding as of Issuance or most Maturity Interest Interest Rate September 30, June 30, (in millions) Term Loan Facility due 2021 Jan 2017 Jan 2021 Monthly LIBOR +2.00% $ 492.5 $ 493.8 B-2 Term Loan Facility Feb 2018 Jan 2024 Monthly LIBOR +2.25% 1,269.3 1,269.3 6.00% Senior Unsecured Notes Jan & Mar 2015 Apr 2023 Apr/Oct 6.00% 1,430.0 1,430.0 6.375% Senior Unsecured Notes May 2015 & Apr 2016 May 2025 May/Nov 6.375% 900.0 900.0 5.75% Senior Unsecured Notes Jan, Apr & Jul 2017 Jan 2027 Jan/Jul 5.75% 1,650.0 1,650.0 Total obligations 5,741.8 5,743.1 Unamortized premium, net 11.6 11.6 Unamortized debt issuance costs (57.1) (59.6) Carrying value of debt 5,696.3 5,695.1 Less current portion (5.0) (5.0) Total long-term debt, less current portion $ 5,691.3 $ 5,690.1 Term Loan Facility and Revolving Credit Facility On May 6, 2015, the Company and Zayo Capital, Inc. (“Zayo Capital”) entered into an Amendment and Restatement Agreement whereby its Credit Agreement (the “Credit Agreement”) governing its senior secured term loan facility (the “Term Loan Facility”) and $450.0 million senior secured revolving credit facility (the “Revolver”) was amended and restated in its entirety. The amended and restated Credit Agreement extended the maturity date of a portion of the outstanding term loans under the Term Loan Facility from July 2, 2019 to May 6, 2021, which was subsequently revised to January 19, 2021 in Incremental Amendment No. 2 (as defined and discussed below). T he terms of the Term Loan Facility require the Company to make quarterly principal payments of 25 basis points per quarter of the original loan amount (unless reduced by any prepayments), plus an annual payment of up to 50% of excess cash flow, as determined in accordance with the Credit Agreement (no such annual payment was required during Fiscal 2019 or Fiscal 2018). On January 15, 2016, the Company and Zayo Capital entered into an Incremental Amendment (the “Amendment”) to its Credit Agreement. Under the terms of the Amendment, the portion of the Term Loan Facility due 2021 was increased by $400.0 million (the “Incremental Term Loan”). The additional amounts borrowed bear interest at LIBOR plus 3.5% with a minimum LIBOR rate of 1.0%. The $400.0 million add-on was priced at 99.0%. No other terms of the Credit Agreement were amended. The Incremental Term Loan proceeds were used to fund the acquisition of Allstream, Inc. and Allstream Fiber U.S. Inc. and for general corporate purposes. On July 22, 2016, the Company and Zayo Capital entered into a Repricing Amendment (the “Repricing Amendment”) to the Credit Agreement. Per the terms of the Repricing Amendment, the Incremental Term Loan was repriced at par and will bear interest at a rate of LIBOR plus 2.75%, with a minimum LIBOR rate of 1.0%, which represented a downward adjustment of 75 basis points. No other terms of the Credit Agreement were amended. On January 19, 2017, the Company and Zayo Capital entered into an Incremental Amendment No. 2 (the “Incremental Amendment”) to the Company’s Credit Agreement. Per the terms of the Incremental Amendment, the existing $1.85 billion of term loans under the Credit Agreement were repriced at 99.75% with one $500.0 million tranche that bears interest at a rate of LIBOR plus 2.0%, with a minimum LIBOR rate of 0.0% and a maturity date of four years from incurrence (January 19, 2021), which represents a downward adjustment of 75 basis points along with the lowering of the previous LIBOR floor, and a second $1.35 billion tranche (the “B-2 Term Loan” and along with the $500.0 million tranche, the “Refinancing Term Loans”) that bears interest at a rate of LIBOR plus 2.5%, with a minimum LIBOR rate of 1.0% and a maturity of seven years from incurrence, which represents a downward adjustment of 25 basis points. In addition, per the terms of the Incremental Amendment, the Company and Zayo Capital added a new $650.0 million term loan tranche under the Credit Agreement (the “Electric Lightwave Incremental Term Loan”) that bears interest at LIBOR plus 2.5%, with a minimum LIBOR rate of 1.0%, with a maturity of seven years from the closing date of the Incremental Amendment. In connection with the Incremental Amendment, the full $2,500.0 million Term Loan Facility, including the Refinancing Term Loans and the Electric Lightwave Incremental Term Loan, was re-issued at a price of 99.75%. No other material terms of the Credit Agreement with respect to the Refinancing Term Loans and the Electric Lightwave Incremental Term Loan were amended. On April 10, 2017, $570.1 million of the B-2 Term Loan and the Electric Lightwave Incremental Term Loan was repaid from proceeds of issuance of senior unsecured notes as further discussed below. Additionally, in July 2017, $310.7 million of the B-2 Term Loan was repaid from the proceeds of issuance of senior unsecured notes as further discussed below. On July 20, 2017, the Company and Zayo Capital entered into a second repricing (the “Repricing Amendment No. 2”) to the Credit Agreement. Per the terms of the Repricing Amendment No. 2, the outstanding balances of the B-2 Term Loan and Electric Lightwave Incremental Term Loan were repriced at par and will bear interest at a rate of LIBOR plus 2.25%, with a minimum LIBOR rate of 1.0%, which represented a downward adjustment of 25 basis points. No other terms of the Credit Agreement were amended. In connection with the Repricing Amendment No. 2, the Company recognized an expense of $4.9 million during the three months ended September 30, 2017 associated with debt extinguishment. The $4.9 million loss on extinguishment of debt primarily represents non-cash expenses associated with the write-off of unamortized debt issuance costs and the issuance discounts on the portion of the Credit Agreement, as further amended. The loss on extinguishment of debt also includes certain fees paid to third parties involved in the Repricing Amendment No. 2. On December 22, 2017, ZGL and Zayo Capital entered into a third repricing amendment (the “Repricing Amendment No. 3”) to the Credit Agreement. Per the terms of the Repricing Amendment No. 3, the Revolver under the Credit Agreement was repriced and will bear interest at a rate of LIBOR plus 1.00% to LIBOR plus 1.75% per annum based on the Company’s leverage ratio, which represented a downward adjustment of 100 basis points. No other terms of the Credit Agreement were amended. T he Revolver matures on April 17, 2020. The Credit Agreement also allows for letter of credit commitments of up to $50.0 million. The Revolver is subject to a fee per annum of 0.25% to 0.375% (based on ZGL’s current leverage ratio) of the weighted-average unused capacity, and the undrawn amount of outstanding letters of credit backed by the Revolver are subject to a 0.25% fee per annum. Outstanding letters of credit backed by the Revolver are subject to a fee of 1.00% to 1.75% per annum based upon ZGL’s leverage ratio. On February 26, 2018, ZGL and Zayo Capital entered into an amendment (the “Incremental Amendment No. 3”) to the Credit Agreement. Per the terms of the Incremental Amendment No. 3, the Company added a new $150 million term loan tranche under the Credit Agreement (the “Incremental $150 Million Term Loan”). The Incremental $150 Million Term Loan will bear interest at LIBOR plus 2.25%, with a minimum LIBOR rate of 1.0%, with a maturity date of January 19, 2024, which is coterminous with the B-2 Term Loan. The Company intends to use the proceeds of the Incremental $150 Million Term Loan for general corporate purposes, including the funding of acquisitions permitted under the Credit Agreement. No other terms of the Credit Agreement were amended. The weighted average interest rates (including margin) on the Term Loan Facility were approximately 4.4% and 4.3% September 30, 2018 and June 30, 2018, respectively. Interest rates on the Revolver as of September 30, 2018 and June 30, 2018 were approximately 4.0% and 3.8%, respectively. As of September 30, 2018, no amounts were outstanding under the Revolver and $1,761.8 million in aggregate principal amount was outstanding under the Term Loan Facility. Standby letters of credit were outstanding in the amount of $8.1 million as of September 30, 2018, leaving $441.9 million available under the Revolver. Senior Unsecured Notes 6.00% Senior Unsecured Notes due 2023 On January 23, 2015 and March 9, 2015, the Company and Zayo Capital completed private offerings of aggregate principal amounts of $700.0 million and $730.0 million, respectively, of 6.00% senior unsecured notes due in 2023 (the “2023 Unsecured Notes”). 6.375% Senior Unsecured Notes due 2025 On April 14, 2016, the Company and Zayo Capital completed a private offering of $550.0 million aggregate principal amount of 2025 Unsecured Notes (the “Incremental 2025 Notes”). The Incremental 2025 Notes were priced at 97.76% and were an additional issuance of the $350.0 million 6.375% senior unsecured notes due in 2025 that were originally issued on May 6, 2015 (the “2025 Notes” and together with the Incremental 2025 Notes, the “2025 Unsecured Notes”). The net proceeds from the Incremental 2025 Notes, plus cash on hand, were used to (i) redeem the then outstanding $325.6 million 10.125% senior unsecured notes due 2020, including the required $20.3 million make-whole premium and accrued interest, and (ii) repay $196.0 million of borrowings under the then outstanding secured Term Loan Facility. 5.75% Senior Unsecured Notes due 2027 On January 27, 2017, the Company and Zayo Capital completed a private offering of $800.0 million aggregate principal amount of 5.75% senior unsecured notes due 2027 (the “January 2027 Notes”), which were issued at par. T he net proceeds from the offering, along with the Electric Lightwave Incremental Term Loan discussed above, were used to fund the Electric Lightwave acquisition . On April 10, 2017, the Company completed a private offering of $550.0 million aggregate principal amount of 5.75% senior unsecured notes due 2027 (the “Incremental 2027 Notes”). The Incremental 2027 Notes were an additional issuance of the January 2027 Notes and were priced at 104.0%. The net proceeds from the Incremental 2027 Notes were used to repay certain outstanding balances on the Company’s B-2 Term Loan. On July 5, 2017, the Company completed a private offering of $300.0 million aggregate principal amount of 5.75% senior notes due 2027 (the “July Incremental 2027 Notes” and together with the Incremental 2027 Notes and the January 2027 Notes, the “2027 Unsecured Notes”). The July Incremental 2027 Notes were an additional issuance of the January 2027 Notes and Incremental 2027 Notes and were priced at 104.25%. The net proceeds of $310.7 million from the offering were used to further repay certain outstanding balances on the Company’s B-2 Term Loan. Debt covenants The indentures (the “Indentures”) governing the 2023 Unsecured Notes, the 2025 Unsecured Notes and the 2027 Unsecured Notes (collectively the “Notes”) contain covenants that, among other things, restrict the ability of the Company and its subsidiaries to incur additional indebtedness and issue preferred stock, pay dividends or make other distributions with respect to any equity interests, make certain investments or other restricted payments, create liens, sell assets, incur restrictions on the ability of the Company’s restricted subsidiaries to pay dividends or make other payments to the Company, consolidate or merge with or into other companies or transfer all or substantially all of their assets, engage in transactions with affiliates, and enter into sale and leaseback transactions. The terms of the Indentures include customary events of default. The Credit Agreement contains customary events of default, including among others, non-payment of principal, interest, or other amounts when due, inaccuracy of representations and warranties, breach of covenants, cross default to certain other indebtedness, insolvency or inability to pay debts, bankruptcy, or a change of control. The Credit Agreement also contains a covenant, applicable only to the Revolver, that the Company maintain a senior secured leverage ratio below or equal to 5.25:1.00 at any time when the aggregate principal amount of loans outstanding under the Revolver is greater than 35% of the commitments under the Revolver. The Credit Agreement also requires the Company and its subsidiaries to comply with customary affirmative and negative covenants, including covenants restricting the ability of the Company and its subsidiaries, subject to specified exceptions, to incur additional indebtedness, make additional guaranties, incur additional liens on assets, or dispose of assets, pay dividends, or make other distributions, voluntarily prepay certain other indebtedness, enter into transactions with affiliated persons, make investments and amend the terms of certain other indebtedness. The Indentures limit any increase in the Company’s secured indebtedness (other than certain forms of secured indebtedness expressly permitted under the Indentures) to a pro forma secured debt ratio of 4.50 times the Company’s previous quarter’s annualized modified EBITDA (as defined in the Indentures), and limit the Company’s incurrence of additional indebtedness to a total indebtedness ratio of 6.00 times the previous quarter’s annualized modified EBITDA. The Company was in compliance with all covenants associated with its debt agreements as of September 30, 2018. Guarantees The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by all of the Company’s current and future domestic restricted subsidiaries. The Notes were co-issued with Zayo Capital, which does not have independent assets or operations. The Term Loan Facility and Revolver are fully and unconditionally guaranteed, jointly and severally, on a senior secured basis by all of the Company’s current and future domestic restricted subsidiaries. Debt issuance costs In connection with the Credit Agreement (and subsequent amendments thereto), and the various Notes offerings, the Company incurred debt issuance costs of $114.1 million (net of extinguishments). These costs are being amortized to interest expense over the respective terms of the underlying debt instruments using the effective interest method, unless extinguished earlier, at which time the related unamortized costs are to be immediately expensed. The balance of debt issuance costs as of September 30, 2018 and June 30, 2018 was $57.1 million and $59.6 million, net of accumulated amortization of $57.0 million and $54.5 million, respectively. The amortization of debt issuance costs is included on the condensed consolidated statements of cash flows within non-cash interest expense along with the amortization or accretion of the premium and discount on the Company’s indebtedness. Interest expense associated with the amortization of debt issuance costs was $2.5 million and$2.3 million for the three months ended September 30, 2018 and 2017, respectively. Debt issuance costs are presented in the condensed consolidated balance sheets as a reduction to long-term debt, non-current.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Sep. 30, 2018
INCOME TAXES
INCOME TAXES	(6) INCOME TAXES A reconciliation of the actual income tax provision and the tax computed by applying the U.S. federal rate to the earnings before income taxes during the three month periods ended September 30, 2018 and 2017 is as follows: Three months ended September 30, 2018 2017 (in millions) Expected expense at the statutory rate $ 8.9 $ 10.0 Increase/(decrease) due to: Non-deductible stock-based compensation 1.1 1.5 State income taxes benefit, net of federal benefit 1.5 0.6 Transaction costs not deductible for tax purposes 0.3 0.1 Change in tax rates (0.1) — Foreign tax rate differential 0.2 (2.2) U.S. Tax Reform 7.6 — Foreign entities with valuation allowance (0.3) (5.7) Other, net 1.3 1.1 Provision for income taxes $ 20.5 $ 5.4 On December 22, 2017, the U.S. federal government enacted a tax bill, H.R.1, An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018, previously known as the Tax Cuts and Jobs Act of 2017 (“U.S. Tax Reform”). U.S. Tax Reform reduced the U.S. corporate tax rate from 35% to 21%, created a territorial tax system with a one-time mandatory repatriation tax on previously deferred foreign earnings, and changed business-related deductions and credits. ASC 740, Income Taxes , requires companies to recognize the effect of tax law changes in the period of enactment. The SEC staff issued SAB 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which will allow registrants to record provisional amounts during a ‘measurement period’. The measurement period is similar to the measurement period used when accounting for business combinations under ASC 805, Business Combinations . SAB 118 allows a registrant to recognize provisional amounts when it does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete its accounting for the change in tax law. The measurement period ends when a registrant has obtained, prepared and analyzed the information necessary to finalize its accounting, but cannot extend beyond one year. In accordance with SAB 118, the Company has recorded a provisional tax expense each quarter as follows: Through June 30, 2018: Tax Expense recognized Through September 30, 2018: (in millions) Change in statutory tax rate, U.S. only $ (16.3) $ 6.2 $ (10.1) Changes to indefinite reinvestment assertion 0.8 — 0.8 Repatriation Tax 37.6 1.4 39.0 Net impacts of U.S. Tax Reform $ 22.1 $ 7.6 $ 29.7 The Company continues to record provisional amounts during the measurement period. The Company has made significant progress in confiming the tax expense; however, as many of the provisions of U.S. Tax Reform require a mid-year measurement, the Company continues to develop methods to address this requirement. Management is in the process of obtaining and evaluating further information related to the provisional amounts estimated for items including the mandatory repatriation amounts and impacts to deferred tax assets and liabilities. Management has made estimates as it anticipates additional guidance and legislative action from the U.S. Federal and State governments in addition to interpretations and guidance from the SEC and FASB regarding the application of U.S. Tax Reform. Future adjustments to the provisional numbers will be recorded as discrete adjustments to income tax expense in the period in which those adjustments become estimable and/or are finalized. As of December 31, 2017, the Company has reversed its indefinite reinvestment assertion on all its foreign subsidiaries because the Company will be required to pay tax on all the accumulated undistributed earnings of its foreign subsidiaries. In accordance with SAB 118, the Company recorded a provisional amount of $0.8 million as a deferred tax liability for an estimate of the additional tax due upon actual repatriation. The interim period effective tax rate is driven from year-to-date and anticipated pre-tax book income for the full fiscal year adjusted for anticipated items that are deductible/non-deductible for tax purposes only (i.e., permanent items). Additionally, the tax expense or benefit related to discrete permanent differences in an interim period are recorded in the period in which they occur. The determination of the effective tax rate is based upon a number of significant estimates and judgments; therefore, there can be significant volatility in interim tax provisions. The interim effective tax rate for the three months ended September 30, 2018 was negatively impacted by U.S. Tax Reform. The Company files income tax returns in various federal, state, and local jurisdictions including the United States, Canada, United Kingdom and France. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world. With few exceptions, the Company is no longer subject to income tax examinations by tax authorities in major tax jurisdictions for years before 2013. As of September 30, 2018 and June 30, 2018, the Company had $3.1 million and $3.0 million, respectively, recorded as a liability for uncertain tax positions. These amounts include accrued interest and penalties of $0.2 million and $0.1 million as of September 30, 2018 and June 30, 2018, respectively. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense.

EQUITY

EQUITY	3 Months Ended
	Sep. 30, 2018
EQUITY
EQUITY	(7) EQUITY During the three months ended September 30, 2018, the Company repurchased 6,229 shares of ZGH outstanding common stock at an average price of $34.00, or $0.2 million. The stock repurchase on behalf of ZGH is included on the consolidated statement of member’s equity as a Capital distribution to parent during the three months ended September 30, 2018. During the three months ended September 30, 2018 , the Company recorded a $26.3 million increase in member’s interest associated with stock-based compensation expense related to the Company’s equity classified stock-based compensation awards (See Note 8 – Stock-based Compensation ).

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Sep. 30, 2018
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION	(8) STOCK-BASED COMPENSATION The following tables summarize the Company’s stock-based compensation expense for liability and equity classified awards included in the condensed consolidated statements of operations. Three Months Ended September 30, 2018 2017 (in millions) Included in: Operating costs $ 2.7 $ 3.2 Selling, general and administrative expenses 24.0 24.6 Total stock-based compensation expense $ 26.7 $ 27.8 Part A restricted stock units $ 23.3 $ 22.2 Part B restricted stock units 2.9 5.1 Part C restricted stock units 0.5 0.5 Total stock-based compensation expense $ 26.7 $ 27.8 Performance Compensation Incentive Program During October 2014, ZGH adopted the 2014 Performance Compensation Incentive Program (“PCIP”). The PCIP includes incentive cash compensation and equity (in the form of restricted stock units or “RSUs”). Grants under the PCIP RSU plans are made quarterly for all participants. The PCIP was effective on October 16, 2014 and will remain in effect for a period of 10 years (or through October 16, 2024) unless it is earlier terminated by ZGH’s Board of Directors. The PCIP has the following components: Part A Under Part A of the PCIP, certain full-time employees, including the Company’s executives, are eligible to earn quarterly awards of RSUs. Each participant in Part A of the PCIP will have an RSU annual award target value, which will be allocated to each fiscal quarter. The final Part A value awarded to a participant for any fiscal quarter is determined by the Compensation Committee of the Board of Directors subsequent to the end of the respective performance period taking into account ZGH’s measured value creation for the quarter, as well as such other subjective factors that it deems relevant (including group and individual level performance factors). The number of Part A RSUs granted will be calculated based on the final award value determined by the Compensation Committee divided by the average closing price of ZGH’s common stock over the last ten trading days of the respective performance period. Part A RSUs will vest assuming continuous employment fifteen months subsequent to the end of the performance period (for awards relating to periods through June 30, 2017) or twelve months subsequent to the end of the performance period (for awards relating to periods subsequent to June 30, 2017). Upon vesting, the RSUs convert to an equal number of shares of ZGH’s common stock. Additionally, under Part A of the PCIP, awards may be granted to certain employees upon commencement of their employment with the Company. During the three months ended September 30, 2018 and 2017, the Company recognized $23.3 million and $22.2 million, respectively, of compensation expense associated with Part A awards. The September 2018 and June 2018 quarterly awards were recorded as liabilities totaling $5.2 million and $5.7 million, as of September 30, 2018 and June 30, 2018, respectively, as the awards represent an obligation denominated in a fixed dollar amount to be settled in a variable number of shares during the subsequent quarter. The quarterly stock-based compensation liability is included in accrued liabilities in the accompanying condensed consolidated balance sheets. Upon the issuance of the RSUs, the liability is re-measured and then reclassified to member’s interest, with a corresponding charge (or credit) to stock based compensation expense. The value of the remaining unvested RSUs is expensed ratably through the vesting date. At September 30, 2018, the remaining unrecognized compensation cost to be expensed over the remaining vesting period for Part A awards is $31.0 million. The following table summarizes the Company’s Part A RSU activity for the three months ended September 30, 2018: Number of Part A Weighted average Weighted average Outstanding at July 1, 2018 2,246,495 $ 35.08 6.4 Granted 763,558 34.48 Vested (686,302) 34.70 Forfeited (120,057) n/a Outstanding at September 30, 2018 2,203,694 $ 34.84 6.1 Part B Under Part B of the PCIP, participants, including the Company’s executives, are awarded quarterly grants of RSUs. The number of the RSUs earned by the participants is based on ZGH’s stock price performance over a performance period of one year with the starting price being the average closing price over the last ten trading days of the quarter immediately prior to the date of grant and the vesting date. The RSUs vest assuming continuous employment through the end of the measurement period, twelve months after the beginning of the performance period (for awards vesting on or prior to June 30, 2018) or fifteen months after the beginning of the performance period (for awards vesting after June 30, 2018). The existence of a vesting provision that is associated with the performance of ZGH’s stock price is a market condition, which affects the determination of the grant date fair value. Upon vesting, RSUs earned convert to an equal number of shares of ZGH’s common stock. The following table summarizes the Company’s Part B RSU activity for the three months ended September 30, 2018: Number of Part B Weighted average Weighted average Outstanding at July 1, 2018 185,775 $ 57.19 8.9 Granted 58,418 64.41 Vested — — Forfeited — n/a Outstanding at September 30, 2018 244,193 $ 58.92 7.4 The table below reflects the total Part B RSUs granted during each period presented, the maximum eligible shares of ZGH’s stock that the respective Part B RSU grant could be converted into shares of ZGH’s common stock, and the grant date fair value per Part B RSU during the period indicated. The table below also reflects the units converted to the ZGH’s common stock at a vesting date that is subsequent to the period indicated for those RSUs granted during the period indicated: During the three months ended September 30, 2018 Part B RSUs granted 58,418 Maximum eligible shares of the Company's common stock 403,084 Grant date fair value per Part B RSU $ 64.41 Units converted to Company's common stock at vesting date n/a During the three months ended June 30, 2018 March 31, 2018 December 31, 2017 September 30, 2017 Part B RSUs granted 78,123 77,218 82,556 163,960 Maximum eligible shares of the Company's common stock 539,049 532,804 569,636 590,256 Grant date fair value per Part B RSU $ 74.44 $ 52.47 $ 45.10 $ 19.06 Units converted to Company's common stock at vesting date n/a n/a n/a 54,671 During the three months ended September 30, 2018 and 2017, the Company recognized stock-based compensation expense of $2.9 million and $5.1 million, respectively, related to Part B awards. The grant date fair value of Part B RSU grants is estimated utilizing a Monte Carlo simulation. This simulation estimates the ten-day average closing stock price ending on the vesting date, the stock price performance over the performance period, and the number of common shares to be issued at the vesting date. Various assumptions are utilized in the valuation method, including the target stock price performance ranges and respective share payout percentages, the Company’s historical stock price performance and volatility, peer companies’ historical volatility and an appropriate risk-free rate. The aggregate future value of the grant under each simulation is calculated using the estimated per share value of the common stock at the end of the vesting period multiplied by the number of common shares projected to be granted at the vesting date. The present value of the aggregate grant is then calculated under each of the simulations, resulting in a distribution of potential present values. The fair value of the grant is then calculated based on the average of the potential present values. The remaining unrecognized compensation cost associated with Part B RSU grants is $7.7 million at September 30, 2018. Part C Under Part C of the PCIP, independent directors of ZGH are eligible to receive quarterly awards of RSUs. Independent directors electing to receive a portion of their annual director fees in the form of RSUs are granted a set dollar amount of Part C RSUs each quarter. The quantity of Part C RSUs granted is based on the average closing price of ZGH’s common stock over the last ten trading days of the quarter ended immediately prior to the grant date and vest at the end of each quarter for which the grant was made. During the three months ended September 30, 2018 and 2017, the Company’s independent directors were granted 14,137 and 15,686 Part C RSUs, respectively. During the three months ended September 30, 2018 and 2017, the Company recognized $0.5 million and $0. 5 million of stock-based compensation expense associated with the Part C RSUs, respectively.

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS	3 Months Ended
	Sep. 30, 2018
EMPLOYEE BENEFITS
EMPLOYEE BENEFITS	(9) EMPLOYEE BENEFITS The service cost component of the defined benefit pension and post-retirement benefit (OPEB) plans is included within selling, general and administrative expenses and all other components are recognized in other income, net in the accompanying condensed consolidated statements of operations. No comparative period figures were disclosed in the tables or notes below, as the amounts for employee benefits were not material for those periods. Pension Plans Three months ended ( in millions) Service cost $ 0.8 Interest cost 0.9 Expected return on plan assets (1.4) Amortization of service cost from earlier periods 0.2 Gain on curtailment (1) (0.4) Net periodic pension benefit cost $ 0.1 (1) During the three months ended September 30, 2018, the Company approved an amendment to the defined benefit pension plan freezing benefit accruals for certain members of the pension plan as of September 30, 2018. The plan freeze had an immaterial impact to the financial statements for the period ended September 30, 2018. OPEB Plans Three months ended (in millions) Interest cost 0.1 Net periodic pension benefit cost $ 0.1

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Sep. 30, 2018
FAIR VALUE MEASUREMENTS
FAIR VALUE MEASUREMENTS	(10) FAIR VALUE MEASUREMENTS The Company’s financial instruments consist of cash and cash equivalents, restricted cash, trade receivables, accounts payable, long-term debt, certain post-employment plans and stock-based compensation liability. The carrying values of cash and cash equivalents, restricted cash, trade receivables and accounts payable approximated their fair values at September 30, 2018 and June 30, 2018 due to the short maturity of these instruments. The carrying value of the Company’s Notes, excluding debt issuance costs, reflects the original amounts borrowed, inclusive of net unamortized premium, and was $4,002.8 million and $4,003. 4 million as of September 30, 2018 and June 30, 2018, respectively. Based on market interest rates for debt of similar terms and average maturities, the fair value of the Company's Notes as of September 30, 2018 and June 30, 2018 was estimated to be $4,051.0 million and $3, 986.5 million, respectively. The Company’s fair value estimates associated with its Note obligations were derived utilizing Level 2 inputs – quoted prices for similar instruments in active markets. The carrying value of the Company’s Term Loan Facility, excluding debt issuance costs, reflects the original amounts borrowed, inclusive of unamortized discounts, and was $1,750.6 million and $1,751.3 million as of September 30, 2018 and June 30, 2018, respectively. The Company’s Term Loan Facility accrues interest at variable rates based upon the one month, three month or nine month LIBOR plus i) a spread of 2.0% on the Company’s $500.0 million tranche (which has a LIBOR floor of 0.0%) and ii) a spread of 2.25% on its B-2 Term Loan tranche (which has a LIBOR floor of 1.00%). Based on market interest rates for debt of similar terms and average maturities, the fair value of the Company’s Term Loan Facility as of September 30, 2018 and June 30, 2018 was estimated to be $1,769.4 million and $1,772.3 million, respectively. The Company’s fair value estimates associated with its Term Loan Facility obligations were derived utilizing Level 2 inputs—quoted prices for similar instruments in active markets. A hypothetical increase in the applicable interest rate on the Company’s Term Loan Facility of one percentage point above the 1.0% LIBOR floor would increase the Company’s annual interest expense by approximately $17.6 million. As of September 30, 2018 and June 30, 2018, there was no balance outstanding under the Company's Revolver.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Sep. 30, 2018
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	(11) COMMITMENTS AND CONTINGENCIES Obligations for Expenditures As of September 30, 2018, the Company was contractually committed for $625.6 million of capital expenditures for construction materials and purchases of property and equipment . A majority of these obligations are expected to be satisfied in the next twelve months. These obligations are primarily success based; that is, the Company has executed customer contracts that support the future capital expenditures. During the three months ended September 30, 2018, the Company entered into a $40.0 million commitment for telecommunications services over a three year period. Outstanding Letters of Credit As of September 30, 2018, the Company had $8.1 million in outstanding letters of credit, which were primarily entered into in connection with various lease agreements. Additionally, as of September 30, 2018, Zayo Canada, Inc., a subsidiary of the Company, had CAD $3.5 million (or $2. 7 million) in letters of credit under a CAD $5.0 million (or $ 3.9 million) unsecured credit agreement. Contingencies In the normal course of business, the Company is party to various outstanding legal proceedings, asserted and unasserted claims, and disputes. In the opinion of management, the ultimate disposition of these matters, both asserted and unasserted, will not have a material adverse effect on the Company’s financial condition, results of operations, or cash flows.

REVENUE AND CONTRACT COSTS

REVENUE AND CONTRACT COSTS	3 Months Ended
	Sep. 30, 2018
REVENUE AND CONTRACT COSTS
REVENUE AND CONTRACT COSTS	(12) REVENUE AND CONTRACT COSTS The Company earns revenues from contracts with customers, primarily through the provision of telecommunications and other related offerings. Revenues from leasing arrangements, such as those from dark fiber contracts and colocation facility rental agreements, are not accounted for under ASC 606 . Other revenues are accounted for under ASC 606, which the Company adopted on July 1, 2018, using the full retrospective transition method. The Company recognizes revenues derived from leasing access to the Company’s fiber optic telecommunications infrastructure and colocation offerings when the offering has been provided and there is persuasive evidence of an arrangement, the fee is fixed or determinable, customer acceptance has been obtained with relevant contract terms, and collection of the receivable is reasonably assured. Taxes collected from customers and remitted to a governmental authority are reported on a net basis and are excluded from revenue. Most revenue is billed in advance on a fixed-rate basis and the remainder is billed in arrears on a transactional basis determined by customer usage. The Company often bills customers for upfront charges, which are non-refundable. These charges relate to activation fees, installation charges or prepayments for future access or offerings and are influenced by various business factors including how the Company and customer agree to structure the payment terms. These upfront charges are assessed to determine if they represent separate performance obligations or to determine if they provide the customer with a material right (such as discounted pricing on renewals or future orders). A majority of the Company’s upfront payments from customers do not relate to a separate performance obligation, do not provide the customer with a material right and are recognized to revenue ratably over the underlying contract term. Upfront payments that give the customer a right to renew a product offering at a discounted rate are amortized over the period the Company expects to provide the underlying offering. The Company typically records revenues from leases of dark fiber, including indefeasible rights-of-use (“IRU”) agreements, over the term that the customer is given exclusive access to the assets. Dark fiber IRU agreements generally require the customer to make a down payment upon the execution of the agreement with monthly IRU fees paid over the contract term; however, in some cases, the Company receives up to the entire lease payment at the inception of the lease and recognizes the revenue ratably over the lease term. Revenue related to professional services to provide network management and technical support is recognized as services are provided. In determining the appropriate amount of revenue and related reserves to reflect in its consolidated financial statements, management evaluates payment history, credit ratings, customer financial performance, and historical or potential billing disputes and related estimates are based on these factors and assumptions. Nature of the Company’s Products and Offerings The Company operates and manages the business in six reportable segments. Revenue is disaggregated by products and offerings, which the Company views as the relevant categorization of revenues for the Company’s businesses. See Note 14 – Segment Reporting , for additional information on the nature of the Company’s Products and Offerings by segment. The Company’s Fiber Solutions and zColo segments have contract terms that are accounted for as leases and are further described below. Fiber Solutions arrangements are generally fixed rate contracts and can be payable upfront, on a monthly recurring basis or a combination of both. Monthly recurring payment structures in this segment generally include annual inflationary pricing escalators. A majority of the revenue earned from the Fiber Solutions segment is not accounted for under ASC 606 as the contract terms are accounted for as lease arrangements. The Company recognizes revenue associated with its dark fiber leases on a straight-line basis from the customer acceptance date through the lease term. The Fiber Solutions segment may provide telecommunications construction solutions or perform variable non-routine maintenance activities that are billable to its customers. These types of solutions are accounted for under ASC 606 and are recognized as the service is performed. Revenue recognized from these non-lease arrangements during the three months ended September 30, 2018 and 2017 was $5.2 million and $4.5 million, respectively. The Company’s contract terms for the zColo segment includes terms that may be fixed or variable. The Company’s zColo revenue contracts generally include multiple performance obligations including space and infrastructure, which is considered a lease component, and power and remote hand component, which are considered to be separate components of the zColo revenue arrangement. The transaction price in contracts that include multiple performance obligations is allocated to each performance obligation based on the Company’s standalone selling price for each component when such offerings are sold separately. In instances where the Company does not sell the product or offering separately, the Company estimates the standalone selling prices based on observable inputs as well as various market conditions. The Company estimates the standalone selling price to be the price of the offerings when sold on a standalone basis without any promotional discounts. The Company recognizes revenue on space and infrastructure leases on a straight-line basis over the customer lease term. The Company’s customer leases often include customary renewal terms; however, the Company does not include any extension options in a customer’s lease term for lease classification purposes or recognizing rental revenue unless it is reasonably certain that the customer will exercise the extension renewal option. The excess of zColo lease revenue recognized in excess of lease payments received is recorded within the other assets on the Company’s condensed consolidated balance sheets. Customer power arrangements are coterminous with the respective customer lease and may be billed at fixed or variable rates. The Company recognizes revenue on its fixed rate power contracts as the arrangements are rendered, as the customer simultaneously receives and consumes the benefit of the arrangements provided. Variable contracts are invoiced based on usage and are billed in arrears and recognized as the usage occurs. Revenue is recognized on remote hand services as the services are provided. Revenue recognized by the zColo segment from these non-lease arrangements during the three months ended September 30, 2018 and 2017 was $14.5 million and $14.1 million, respectively. Contracts in the Company’s zColo segment do not include significant financing components. The Company’s contract terms for Transport, Enterprise Networks, Allstream and Other segments include terms that may be fixed or variable. The Company recognizes revenue on its fixed rate contracts as the product offerings are rendered, as the customer simultaneously receives and consumes the benefit of the products provided. Variable contracts are invoiced based on usage and are billed in arrears and recognized as the usage occurs. These contracts do not include significant financing components and generally include a single performance obligation. The transaction price in contracts that include multiple performance obligations is allocated to each performance obligation based on the Company’s standalone selling price for each product offering. The Company estimates the standalone selling price to be the price of the offering when sold on a standalone basis without any promotional discounts. The Company may provide performance-based credits associated with the solution it offers, which are accounted for as variable consideration when estimating the transaction price. Credits are estimated at contract inception and are updated at the end of each reporting period as additional information becomes available. The assessment of this variable consideration involves judgment and impacts the Company’s determination of transaction price and related disclosures. Remaining Performance Obligation Associated with Non-Lease Arrangements A majority of the Company’s revenue is provided over a contract term. When allocating the total contract transaction price to identified performance obligations, a portion of the total transaction price relates to performance obligations that are yet to be satisfied or are partially satisfied as of the end of the reporting period. In determining the transaction price allocated to remaining performance obligations, the Company does not include non-recurring charges and estimates for usage. Remaining performance obligations associated with the Company’s contracts reflect recurring charges billed, adjusted to reflect estimates for sales incentives and revenue adjustments. The table below reflects an estimate of the remaining transaction price of fixed fee, non-lease revenue arrangements to be recognized in the future periods presented. The table below does not include estimated amounts to be recognized in future periods associated with variable usage-based consideration. Nine months ended Year ended June 30, June 30, 2020 2021 2022 2023 Thereafter Total (in millions) Reportable Segment Fiber Solutions $ 8.8 $ 1.1 $ 0.3 $ — $ — $ — $ 10.2 Transport 313.5 236.3 112.6 36.8 16.5 20.6 736.3 Enterprise Networks 180.3 133.1 58.8 14.9 5.0 0.7 392.8 zColo 25.6 20.3 10.4 5.1 2.8 3.9 68.1 Allstream 115.4 49.6 14.6 2.5 0.6 0.1 182.8 Total $ 643.6 $ 440.4 $ 196.7 $ 59.3 $ 24.9 $ 25.3 $ 1,390.2 Contract Assets and Liabilities The timing of revenue recognition may differ from the time of billing to the Company’s customers. Customer receivables represent an unconditional right to consideration net of an estimated allowance for doubtful accounts. Contract balances represent amounts from an arrangement when either the Company has performed, by transferring a solution to the customer in advance of receiving all or partial consideration for such goods and offerings from the customer, or the customer has made payment to the Company in advance of obtaining control of the goods and/or offerings promised to the customer in the contract. Contract liabilities arise when the Company bills its customers and receives consideration in advance of providing the goods or offerings promised in the contract. Contract liabilities are recognized as revenue when product offerings are provided to the customer. Contract liabilities are presented in the Company’s condensed consolidated balance sheet as deferred revenue. The following table presents information about the Company’s customer receivables, contract assets and contract liabilities as of September 30, 2018 and June 30, 2018: September 30, 2018 June 30, 2018 (in millions) Customer receivable, net (1) $ 160.0 $ 164.0 Contract liabilities (1) $ 64.0 $ 68.9 (1) - Amounts do not include balances associated with lease revenue from the Company’s Fiber Solutions and zColo segments. During the three months ended September 30, 2018 and 2017, the Company recognized $5.4 million and $5.6 million of revenue that was included in contract liabilities as of June 30, 2018 and June 30, 2017, respectively. Contract Costs The Company recognizes an asset for incremental commission and bonus expenses paid to internal sales personnel and third party agents in conjunction with obtaining certain customer contracts. These costs are only deferred when the commissions are incremental and would not have been incurred absent the customer contract. Costs to obtain a contract are amortized and recorded ratably within selling, general and administrative expenses on the Company’s condensed consolidated statements of operations over the estimated contract term. The Company also defers costs incurred to fulfill contracts that relate directly to the contract, are expected to generate resources that will be used to satisfy the Company’s performance obligation under the contract and are expected to be recovered through revenue generated under the contract. Contract fulfillment costs are expensed to cost of service as the Company satisfies its performance obligations. These costs principally relate to direct costs associated with activating new customer solutions. The Company estimates the amortization period for its costs incurred to obtain and fulfill customer contracts at a portfolio level due to the similarities within its customer contract portfolios. Other costs, such as general costs or costs related to past performance obligations, are expensed as incurred. As of September 30, 2018 and June 30, 2018, the Company had $6.6 million and $7.1 million, respectively, of short-term unamortized contract costs included in other current assets and $4.9 million and $5.6 million, respectively, of long term unamortized contact contract costs included in other assets on its condensed consolidated balance sheets. During the three months ended September 30, 2018 and 2017, respectively, the Company recorded $2.1 million and $2.2 million in selling, general and administrative expenses associated with the amortization of deferred contract costs. The amortization period for these contract costs ranges from 12 to 57 months.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	3 Months Ended
	Sep. 30, 2018
RELATED PARTY TRANSACTIONS
RELATED-PARTY TRANSACTIONS	(13) RELATED-PARTY TRANSACTIONS In May 2016, Communication Infrastructure Investments, LLC sold Onvoy, LLC and its subsidiaries (“OVS”), a company that provided voice and managed offerings that the Company spun off during the year ended June 30, 2014, to an entity that had a material ownership interest in the Company during Fiscal 2018 and that shares a board member with the Company . As of June 30, 2018, the entity that owns Inteliquent, Inc., successor by merger to OVS (“Inteliquent”), no longer has an ownership interest in the Company and is no longer considered a related party. The following table represents the revenue and expense transactions the Company recorded with Inteliquent for the prior period: Three Months Ended September 30, 2017 (in millions) Revenues $ 1.9 Operating costs $ 0.6 Dan Caruso, the Company’s Chief Executive Officer and Chairman of the Board, is a party to an aircraft charter (or membership) agreement through his affiliate, Bear Equity LLC, for business and personal travel. Under the terms of the charter agreement, all fees for the use of the aircraft are effectively variable in nature. For his business travel on behalf of the Company, Mr. Caruso is reimbursed for his use of the aircraft subject to an annual maximum reimbursement threshold approved by the Company's Nominating and Governance Committee. In each of the three months ended September 30, 2018 and 2017, the Company reimbursed Mr. Caruso $0.1 million for his business use of the aircraft.

SEGMENT REPORTING

SEGMENT REPORTING	3 Months Ended
	Sep. 30, 2018
SEGMENT REPORTING
SEGMENT REPORTING	(14) SEGMENT REPORTING The Company uses the management approach to determine the segment financial information that should be disaggregated and presented separately in the Company's notes to its condensed consolidated financial statements. The management approach is based on the manner by which management has organized the segments within the Company for making operating decisions, allocating resources, and assessing performance. As the Company has increased in scope and scale, it has developed its management and reporting structure to support this growth. The Company’s bandwidth infrastructure, colocation and connectivity offerings are comprised of various related product groups generally defined around the type of offering to which the customer is licensing access, referred to as SPGs. Each SPG is responsible for the revenue, costs and associated capital expenditures of its respective solutions. The SPGs enable licensing and sales, make pricing and product decisions, engineer networks and deliver solutions to customers, and support customers for specific telecom and Internet infrastructure requirements. During Fiscal 2018, with the continued increase in its scope and scale, the Company’s chief operating decision maker ("CODM"), who is the Company’s Chief Executive Officer, implemented certain organizational changes to the management and operation of the business that directly impact how the CODM makes resource allocation decisions and manages the Company. The changes in structure had the impact of creating two new SPGs and re-aligning an existing SPG among the Company’s reportable segments. The changes in structure also resulted in changes in how the Company measures the relative burden each segment bears of indirect and corporate related costs. Effective April 1, 2018 the Company’s Ethernet SPG, previously reported under the Enterprise Networks segment, is now reported under the Company’s Transport segment. Additionally, certain activities and operations of the legacy Waves, WAN, and Ethernet SPGs were combined to form a new SPG, CloudLink. These changes to the existing reportable segments (the “Realignment”) have been recast for all prior period financial and operating metrics presented in this Quarterly Report on Form 10-Q for comparability, such as; · Certain activities and operations of the legacy Waves, WAN, and Ethernet SPGs, after giving effect to the Realignment, are now reported in a new SPG, CloudLink, under the Enterprise Networks segment; and · The wholesale IP services and Sonet SPGs, and the remaining activities and operations of the legacy Waves and Ethernet SPGs (the activities and operations not related to CloudLink), after giving effect to the Realignment, are now reported under the Transport segment. In addition to the changes in structure, the Company also adjusted intercompany pricing methodologies to more closely align to third party pricing on the products and offerings which are exchanged between our SPGs. However, it was not practicable to retrospectively present the impact of this change for all historical periods presented. The Company’s segments are further described below: Fiber Solutions . The Fiber Solutions segment offers access to raw bandwidth infrastructure to customers that require control of their internal networks. These solutions include dark fiber, dedicated lit network sections and mobile infrastructure (fiber-to-the-tower and small cell). Dark fiber is a physically separate and secure, private platform for dedicated bandwidth. The Company leases dark fiber pairs (usually 2 to 12 total fibers) to customers, who “light” the fiber using their own optronics. The Company’s mobile infrastructure solutions permit direct fiber connections to cell towers, small cells, hub sites, and mobile switching centers. Fiber Solutions customers include carriers and other communication service providers, Internet service providers, wireless service providers, major media and content companies, large enterprises, and other companies that have the expertise to run their own fiber optic networks or require interconnected technical space. The contract terms in the Fiber Solutions segment tend to range from three to twenty years. Transport. The Transport segment provides access to lit bandwidth infrastructure solutions over metro, regional, and long-haul fiber network sections. The segment uses customer-accessed optronics to light the fiber, and the Company’s customers pay for access based on the amount and type of bandwidth they require. The offerings within this segment include Wavelengths, Ethernet, SONET, and wholesale IP offerings. The Company targets customers who require a minimum of 10G of bandwidth across their networks. Transport customers include carriers, content providers, financial services companies, healthcare, government entities, education institutions and other medium and large enterprises. The contract terms in this segment tend to range from two to five years. Enterprise Networks . The Enterprise Networks segment provides connectivity and telecommunications solutions to medium and large enterprises. The offerings within this segment include Internet, wide area networking products, managed products and cloud based computing and storage offerings. Solutions range from point-to-point data connections to multi-site managed networks to international outsourced IT infrastructure environments. The contract terms in the Enterprise Networks segment tend to range from one to ten years. Zayo Colocation (“zColo”) . The Colocation segment provides data center infrastructure solutions to a broad range of enterprise, carrier, cloud, and content customers. The offerings within this segment include the provision of colocation space, power and interconnection offerings in North America and Western Europe. Solutions range in size from single cabinet solutions to 1MW+ data center infrastructure environments. The Company’s data centers also support a large component of networking components for the purpose of aggregating and accommodating customers’ data, voice, Internet, and video traffic. The contract terms in this segment tend to range from two to five years. Allstream . The Allstream segment provides Cloud VoIP and Data Solutions. This includes a full range of local voice offerings allowing business customers to complete telephone calls in their local exchange, as well as make long distance, toll-free and related calls. Unified Communications is the integration of real-time communication services such as telephony (including Cloud-based IP telephony), instant messaging and video conferencing with non-real-time communication services, such as integrated voicemail and e-mail. Allstream also provides customers with comprehensive telecommunications services, including Ethernet, and IP/MPLS VPN Solutions. Other . The Other segment is primarily comprised of Zayo Professional Services (“ZPS”). ZPS provides network and technical resources to customers who wish to leverage the Company’s expertise in designing, acquiring and maintaining network sections. The contract terms typically run for one year for a fixed recurring monthly fee in the case of network and on an hourly basis for technical resources (usage revenue). ZPS also generates revenue via telecommunication equipment sales. The results of operations for each segment include an allocation of certain indirect costs and corporate related costs, including overhead and third party-financed debt. The allocation is based on a percentage that represents management’s estimate of the relative burden each segment bears of indirect and corporate costs. Management has evaluated the allocation methods utilized to allocate these costs and determined they are systematic, rational and consistently applied. Identifiable assets for each reportable segment are reconciled to total consolidated assets including unallocated corporate assets and intersegment eliminations. Unallocated corporate assets consist primarily of cash and deferred taxes. In connection with the Company’s acquisition of Electric Lightwave Parent, Inc., the Company acquired certain customer contracts that included the bundled provision of VoIP and data connectivity solutions. This bundled package was historically managed and reported as revenue by the Enterprise Networks segment. Subsequent to June 30, 2018, operational changes were made which resulted in the management of these bundled contracts to be provided by the Allstream segment and as such a portion of the revenue associated with these contracts will now be reported as revenue of the Allstream segment. The Enterprise Networks segment continues to own the infrastructure and equipment that supports these contracts and as such the segments entered into an intercompany agreement for the continued use of these assets, which will result in the recognition of intercompany revenue at the Enterprise Networks segment. Management determined it was impracticable to retrospectively present the impacts of this change to historical periods. This change increased Allstream’s Segment Adjusted EBITDA by $0.7 million and decreased Enterprise’s Segment Adjusted EBITDA by $0.7 million for the three months ended September 30, 2018. Segment Adjusted EBITDA Segment Adjusted EBITDA is the primary measure used by the Company’s CODM to evaluate segment operating performance. The Company defines Segment Adjusted EBITDA as earnings/(loss) from operations before interest, income taxes, depreciation and amortization (“EBITDA”) adjusted to exclude acquisition or disposal-related transaction costs, losses on extinguishment of debt, stock-based compensation, unrealized foreign currency gains/(losses) on intercompany loans, gains/(losses) on business dispositions and non-cash income/(loss) on equity and cost method investments. The Company uses Segment Adjusted EBITDA to evaluate operating performance, and this financial measure is among the primary measures used by management for planning and forecasting of future periods. The Company believes that the presentation of Segment Adjusted EBITDA is relevant and useful for investors because it allows investors to view results in a manner similar to the method used by management and facilitates comparison of the Company’s results with the results of other companies that have different financing and capital structures. Segment Adjusted EBITDA results, along with other quantitative and qualitative information, are also utilized by the Company and its Compensation Committee for purposes of determining bonus payouts to employees. Segment Adjusted EBITDA has limitations as an analytical tool and should not be considered in isolation from, or as a substitute for, analysis of the Company’s results from operations and operating cash flows as reported under GAAP. For example, Segment Adjusted EBITDA: · does not reflect capital expenditures, or future requirements for capital and major maintenance expenditures or contractual commitments; · does not reflect changes in, or cash requirements for, working capital needs; · does not reflect the significant interest expense, or the cash requirements necessary to service the interest payments, on the Company’s debt; and · does not reflect cash required to pay income taxes. The Company’s computation of Segment Adjusted EBITDA may not be comparable to other similarly titled measures computed by other companies because all companies do not calculate segment Adjusted EBITDA in the same fashion. As of and for the three months ended September 30, 2018 Fiber Transport Enterprise zColo Allstream Other Corp/ Total (in millions) Revenue from external customers $ 220.9 $ 168.4 $ 82.6 $ 59.0 $ 105.0 $ 5.2 $ — $ 641.1 Segment Adjusted EBITDA 178.4 57.1 34.0 28.0 20.8 1.1 — 319.4 Total assets 4,991.0 1,878.0 755.9 1,038.4 427.3 32.4 187.3 9,310.3 Capital expenditures 99.1 40.4 13.2 25.2 4.6 — — 182.5 As of and for the three months ended September 30, 2017 Fiber Transport Enterprise zColo Allstream Other Corp/ Total (in millions) Revenue from external customers $ 198.4 $ 168.0 $ 85.4 $ 58.4 $ 127.7 $ 5.2 $ — $ 643.1 Segment Adjusted EBITDA 159.7 60.3 33.4 28.6 33.2 1.3 (0.1) 316.4 Capital expenditures 107.3 44.3 10.4 27.9 3.5 — — 193.4 As of June 30, 2018 Fiber Transport Enterprise Networks zColo Allstream Other Corp/ Total (in millions) Total assets $ 4,937.3 1,870.9 754.6 1,032.4 465.5 33.4 111.2 $ 9,205.3 Reconciliation from Total Segment Adjusted EBITDA to income from operations before taxes: For the three months ended September 30, 2018 2017 (in millions) Total Segment Adjusted EBITDA $ 319.4 $ 316.4 Interest expense (82.2) (73.6) Depreciation and amortization expense (167.8) (183.8) Transaction costs (0.7) (8.3) Stock-based compensation (26.7) (27.8) Loss on extinguishment of debt — (4.9) Foreign currency (loss)/gain on intercompany loans (4.6) 10.8 Gain on business disposition 5.5 — Non-cash loss on investments (0.3) (0.1) Income from operations before income taxes $ 42.6 $ 28.7

CONDENSED CONSOLIDATING FINANCI

CONDENSED CONSOLIDATING FINANCIAL INFORMATION	3 Months Ended
	Sep. 30, 2018
CONDENSED CONSOLIDATING FINANCIAL INFORMATION
CONDENSED CONSOLIDATING FINANCIAL INFORMATION	(15) CONDENSED CONSOLIDATING FINANCIAL INFORMATION As discussed Note 5 – Long-Term Debt , as of September 30, 2018, the Company has outstanding $1,430.0 million 2023 Unsecured Notes, $900.0 million 2025 Unsecured Notes and $1,650.0 million of 2027 Unsecured Notes. The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by all of the Company’s current and future domestic restricted subsidiaries. Zayo Capital does not have independent assets or operations. The non-guarantor subsidiaries consist of the foreign subsidiaries that were acquired in conjunction with the Company's acquisitions. The accompanying condensed consolidating financial information has been prepared and is presented to display the components of the Company’s balance sheets, statements of operations and statements of cash flows in a manner that allows an existing or future holder of the Company’s Notes to review and analyze the current financial position and recent operating results of the legal subsidiaries that guarantee the Company’s debt obligations. The operating activities of the separate legal entities included in the Company’s consolidated financial statements are interdependent. The accompanying condensed consolidating financial information presents the results of operations, financial position and cash flows of each legal entity. Zayo Group and its guarantors provide services to each other during the normal course of business. These transactions are eliminated in the consolidated results of operations of the Company. Activity related to income taxes is included at the issuer, or Zayo Group level, and the Company's non-guarantor subsidiaries and is not allocated to the Company's guarantor subsidiaries in the condensed consolidated financial information presented below. Condensed Consolidating Balance Sheets (Unaudited) September 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Assets Current assets Cash and cash equivalents $ 224.2 $ 7.4 $ 121.6 $ — 353.2 Trade receivables, net of allowance 134.4 0.8 92.0 — 227.2 Prepaid expenses 49.3 0.1 18.8 — 68.2 Other current assets 65.4 — (37.7) — 27.7 Total current assets 473.3 8.3 194.7 — 676.3 Property and equipment, net 4,779.7 — 745.0 — 5,524.7 Intangible assets, net 1,046.6 8.7 137.2 — 1,192.5 Goodwill 1,520.3 14.6 175.3 — 1,710.2 Deferred income taxes, net — — 36.2 — 36.2 Other assets 134.9 — 35.5 — 170.4 Related party receivable 365.9 — — (365.9) — Investment in subsidiary 684.9 — — (684.9) — Total assets $ 9,005.6 $ 31.6 $ 1,323.9 $ (1,050.8) $ 9,310.3 Liabilities and member's equity Current liabilities Accounts payable $ 24.5 $ 0.1 $ 17.3 $ — $ 41.9 Accrued liabilities 235.4 0.9 77.9 — 314.2 Accrued interest 85.4 — — — 85.4 Current portion of long-term debt 5.0 — — — 5.0 Capital lease obligations, current 9.0 — 1.5 — 10.5 Deferred revenue, current 136.9 0.1 34.6 — 171.6 Total current liabilities 496.2 1.1 131.3 — 628.6 Long-term debt, non-current 5,691.3 — — — 5,691.3 Related party debt, long-term — — 365.9 (365.9) — Capital lease obligation, non-current 133.3 — 9.6 — 142.9 Deferred revenue, non-current 987.8 — 97.8 — 1,085.6 Deferred income taxes, net 134.4 — 33.1 — 167.5 Other long-term liabilities 20.5 — 31.8 — 52.3 Total liabilities 7,463.5 1.1 669.5 (365.9) 7,768.2 — Member's equity Member's interest 1,911.8 15.1 546.8 (571.0) 1,902.7 Accumulated other comprehensive loss (9.2) — (9.2) 9.2 (9.2) Accumulated deficit (360.5) 15.4 116.8 (123.1) (351.4) Total member's equity 1,542.1 30.5 654.4 (684.9) 1,542.1 Total liabilities and member's equity $ 9,005.6 $ 31.6 $ 1,323.9 $ (1,050.8) $ 9,310.3 Condensed Consolidating Balance Sheets (Unaudited) June 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Assets Current assets Cash and cash equivalents $ 138.1 $ 5.9 $ 112.0 $ — $ 256.0 Trade receivables, net of allowance 134.9 2.7 98.0 — 235.6 Prepaid expenses 52.0 0.2 21.9 — 74.1 Other current assets 56.5 — (30.7) — 25.8 Assets held for sale 41.8 — — — 41.8 Total current assets 423.3 8.8 201.2 — 633.3 Property and equipment, net 4,698.9 — 728.7 — 5,427.6 Intangible assets, net 1,064.6 9.2 138.3 — 1,212.1 Goodwill 1,526.6 14.6 177.9 — 1,719.1 Deferred income taxes, net — — 37.6 — 37.6 Other assets 141.1 — 34.5 — 175.6 Related party receivable 362.7 — — (362.7) — Investment in subsidiary 661.0 — — (661.0) — Total assets $ 8,878.2 $ 32.6 $ 1,318.2 $ (1,023.7) $ 9,205.3 Liabilities and member's equity — Current liabilities Accounts payable $ 24.5 $ 0.1 $ 21.3 $ — $ 45.9 Accrued liabilities 237.8 0.7 76.6 — 315.1 Accrued interest 72.6 — — — 72.6 Current portion of long-term debt 5.0 — — — 5.0 Capital lease obligations, current 10.6 — 1.3 — 11.9 Deferred revenue, current 126.3 0.2 36.4 — 162.9 Liabilities associated with assets held for sale 6.1 — — — 6.1 Total current liabilities 482.9 1.0 135.6 — 619.5 Long-term debt, non-current 5,690.1 — — — 5,690.1 Related party debt, long-term — — 362.7 (362.7) — Capital lease obligation, non-current 111.4 — 10.2 — 121.6 Deferred revenue, non-current 963.8 — 112.5 — 1,076.3 Deferred income taxes, net 120.0 — 32.4 — 152.4 Other long-term liabilities 22.4 — 35.4 — 57.8 Total liabilities 7,390.6 1.0 688.8 (362.7) 7,717.7 — — — Member's equity — — — Member's interest 1,885.7 16.8 537.3 (563.2) 1,876.6 Accumulated other comprehensive loss (15.5) — (15.5) 15.5 (15.5) Accumulated deficit (382.6) 14.8 107.6 (113.3) (373.5) Total member's equity 1,487.6 31.6 629.4 (661.0) 1,487.6 Total liabilities and member's equity $ 8,878.2 $ 32.6 $ 1,318.2 $ (1,023.7) $ 9,205.3 Condensed Consolidating Statements of Comprehensive Income For the three months ended September 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Revenue $ 498.6 $ 5.2 $ 137.3 $ — $ 641.1 Operating costs and expenses — — — — Operating costs (excluding depreciation amortization and including stock-based compensation) 160.7 3.7 64.0 — 228.4 Selling, general and administrative expenses (including stock-based compensation) 91.3 0.4 30.4 — 122.1 Depreciation and amortization 146.0 0.5 21.3 — 167.8 Total operating costs and expenses 398.0 4.6 115.7 — 518.3 Operating income 100.6 0.6 21.6 — 122.8 Other expenses Interest expense (76.5) — (5.7) — (82.2) Foreign currency loss on intercompany loans (2.2) — (2.4) — (4.6) Other expense 6.2 — 0.4 — 6.6 Equity in net earnings of subsidiaries 9.8 — — (9.8) — Total other expense, net (62.7) — (7.7) (9.8) (80.2) Income/(loss) from operations before income taxes 37.9 0.6 13.9 (9.8) 42.6 Provision/(benefit) for income taxes 15.8 — 4.7 — 20.5 Net income/(loss) 22.1 0.6 9.2 (9.8) 22.1 Other comprehensive income, net of income taxes 6.3 — 6.3 (6.3) 6.3 Comprehensive income $ 28.4 $ 0.6 $ 15.5 $ (16.1) $ 28.4 Condensed Consolidating Statements of Comprehensive Income For the three months ended September 30, 2017 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Revenue $ 487.8 $ 5.1 $ 150.2 $ — $ 643.1 Operating costs and expenses — — — — Operating costs (excluding depreciation amortization and including stock-based compensation) 161.1 3.8 70.8 — 235.7 Selling, general and administrative expenses (including stock-based compensation) 92.8 0.3 35.0 — 128.1 Depreciation and amortization 154.6 0.5 28.7 — 183.8 Total operating costs and expenses 408.5 4.6 134.5 — 547.6 Operating income 79.3 0.5 15.7 — 95.5 Other expenses Interest expense (68.0) — (5.6) — (73.6) Loss on extinguishment of debt (4.9) — — — (4.9) Foreign currency loss on intercompany loans 5.3 — 5.5 — 10.8 Other expense 0.2 — 0.7 — 0.9 Equity in net earnings of subsidiaries 17.0 — — (17.0) — Total other expense, net (50.4) — 0.6 (17.0) (66.8) Income/(loss) from operations before income taxes 28.9 0.5 16.3 (17.0) 28.7 Provision/(benefit) for income taxes 5.6 — (0.2) — 5.4 Net income/(loss) 23.3 0.5 16.5 (17.0) 23.3 Other comprehensive income, net of income taxes 22.1 — 22.1 (22.1) 22.1 Comprehensive income $ 45.4 $ 0.5 $ 38.6 $ (39.1) $ 45.4 Condensed Consolidating Statements of Cash Flows For the three months ended September 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Total (in millions) Net cash provided by operating activities $ 212.0 $ 3.1 $ 26.7 $ 241.8 Cash flows from investing activities: Purchases of property and equipment (150.5) — (32.0) (182.5) Proceeds from sale of SRT, net of cash held in escrow 39.0 — — 39.0 Net cash used in investing activities (111.5) — (32.0) (143.5) Cash flows from financing activities: Principal payments on long-term debt (1.3) — — (1.3) Principal repayments on capital lease obligations (1.6) — (0.3) (1.9) Payments to repurchase ZGH common stock (0.2) — — (0.2) Contributions to parent (8.7) (1.6) 10.3 — Cash paid for Santa Clara acquisition (3.3) — — (3.3) Net cash provided by financing activities (15.1) (1.6) 10.0 (6.7) Effect of changes in foreign exchange rates on cash — — 2.2 2.2 Net increase in cash, cash equivalents and restricted cash 85.4 1.5 6.9 93.8 Cash, cash equivalents and restricted cash, beginning of year 142.7 5.9 112.0 260.6 Cash, cash equivalents and restricted cash, end of period $ 228.1 $ 7.4 $ 118.9 $ 354.4 Condensed Consolidating Statements of Cash Flows For the three months ended September 30, 2017 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Total (in millions) Net cash provided by operating activities $ 213.6 $ 3.6 $ 51.6 $ 268.8 — — — Cash flows from investing activities: — — — Purchases of property and equipment (176.3) — (17.1) (193.4) Net cash used in investing activities (176.3) — (17.1) (193.4) Cash flows from financing activities: Proceeds from debt 312.8 — — 312.8 Principal payments on long-term debt (311.9) — — (311.9) Principal repayments on capital lease obligations (1.6) — (0.1) (1.7) Payment of debt issuance costs (3.4) — — (3.4) Contributions to parent 1.1 (1.1) — — Cash paid for Santa Clara acquisition (1.3) — — (1.3) Net cash provided by financing activities (4.3) (1.1) (0.1) (5.5) Effect of changes in foreign exchange rates on cash — — 0.6 0.6 Net increase in cash, cash equivalents and restricted cash 33.0 2.5 35.0 70.5 Cash, cash equivalents and restricted cash, beginning of year 101.1 2.1 121.3 224.5 Cash, cash equivalents and restricted cash, end of period $ 134.1 $ 4.6 $ 156.3 $ 295.0

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	3 Months Ended
	Sep. 30, 2018
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	(16) SUBSEQUENT EVENTS Share Repurchases and Revolving Credit Facility Borrowings Under the Company’s outstanding share repurchase authorization (see Note 7 – Equity) , the Company repurchased 12,966,527 shares of ZGH’s outstanding common stock from October 1, 2018 through November 6, 2018 at an average price of $31.02, or $402.3 million, which results in $4.0 million remaining under the $500 million share repurchase authorization. The share repurchases were partially funded by an aggregate amount of $200.0 million of borrowings under the Revolver during October and November resulting in $241.9 million in availability under the Revolver. See Note 5 – Long-term debt for information on the Revolver. Announcement of Plans to Separate into Two Public Companies On November 7, 2018, ZGH announced its plans to separate into two public companies, one focused on communications infrastructure (“InfraCo”) and one on enterprise services (“EnterpriseCo”). InfraCo will be comprised of the current Fiber Solutions and zColo business segments, along with the Wavelength and IP Transit businesses of the current Transport segment. EnterpriseCo will be comprised of the current Enterprise Networks and Allstream segments, along with the SONET and Ethernet businesses of the current Transport segment. The transaction is expected to be consummated via a pro rata taxable spin-off of EnterpriseCo and is expected to be completed in late 2019. Consummation of the transaction is subject to regulatory approval and approval by ZGH’s Board of Directors.

BUSINESS AND BASIS OF PRESENT_2

BUSINESS AND BASIS OF PRESENTATION (Policies)	3 Months Ended
	Sep. 30, 2018
BUSINESS AND BASIS OF PRESENTATION
Business	Business Zayo Group, LLC, a Delaware limited liability company, was formed on May 4, 2007, and is the operating parent company of a number of subsidiaries engaged in providing access to bandwidth infrastructure. Zayo Group LLC and its subsidiaries are collectively referred to as “Zayo Group” or the “Company.” Headquartered in Boulder, Colorado, the Company provides communication infrastructure solutions, including fiber and bandwidth connectivity, colocation and cloud infrastructure, to businesses primarily in the United States (“U.S.”), Canada and Europe. The Company provides its products and offerings through six segments: · Fiber Solutions, including dark fiber and mobile infrastructure solutions. · Transport, including Ethernet, wavelength, wholesale IP, and SONET solutions. · Enterprise Networks, including private lines, dedicated Internet and cloud-based computing and storage products. · Colocation, including provision of colocation space and power and interconnection offerings. · Allstream, including Cloud VoIP and Data Solutions. · Other offerings, including Zayo Professional Services. On May 3, 2018, the Company announced that it completed the first phase of its investigation on the advisability and feasibility of a conversion of Zayo Group Holdings Inc. (“ZGH”) to a real estate investment trust for U.S. federal income tax purposes (a “REIT”). The Company has begun the next phase of its evaluation and preparation for a potential conversion of ZGH to a REIT. As part of these efforts, the Company has begun a direct dialogue with the U.S. Internal Revenue Service (“IRS”) in an effort to obtain clarity and support for its position, and ZGH is seeking a private letter ruling (“PLR”) from the IRS. The ability of ZGH to qualify for taxation as a REIT will depend upon its continuing compliance following REIT conversion with various requirements, including requirements related to the nature of its assets, the sources of its income and the distributions to its stockholders. ZGH is requesting that the PLR address whether ZGH’s revenues from dark and lit fiber satisfy applicable REIT income tests, and ZGH’s ultimate decision to convert to a REIT may depend upon a favorable ruling from the IRS on this topic. ZGH submitted a PLR request to the IRS in July 2018, but the IRS may not provide a response until 2019 or later or may not respond at all.
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements include all the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated in consolidation. The accompanying condensed consolidated financial statements and related notes are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q, and do not include all of the note disclosures required by GAAP for complete financial statements. These condensed consolidated financial statements should, therefore, be read in conjunction with the consolidated financial statements and notes thereto for the year ended June 30, 2018 included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2018. In the opinion of management, all adjustments considered necessary for the fair presentation of financial position, results of operations and cash flows of the Company have been included herein. The results of operations for the three months ended September 30, 2018 are not necessarily indicative of the operating results for any future interim period or the full year. Unless otherwise noted, dollar amounts and disclosures throughout the Notes to the condensed consolidated financial statements are presented in millions of dollars. The Company’s fiscal year ends June 30 each year, and we refer to the fiscal year ending June 30, 2019 as “Fiscal 2019” and the fiscal year ended June 30, 2018 as “Fiscal 2018.”
Use of Estimates	Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Estimates are used when establishing allowances for doubtful accounts and accruals for billing disputes, determining useful lives for depreciation and amortization and accruals for exit activities associated with real estate leases, assessing the need for impairment charges (including those related to intangible assets and goodwill), determining the fair values of assets acquired and liabilities assumed in business combinations, accounting for income taxes and related valuation allowances against deferred tax assets, determining the defined benefit costs and defined benefit obligations related to post-employment benefits, determining the fair value of plan assets related to post-employment benefits and estimating certain restricted stock unit grant fair values used to compute the stock-based compensation liability and expense. Management evaluates these estimates and judgments on an ongoing basis and makes estimates based on historical experience, current conditions, and various other assumptions that are believed to be reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from these estimates under different assumptions or conditions.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income , which allows companies to reclassify the income tax effects resulting from tax bill, H.R.1, from accumulated other comprehensive income to retained earnings. The standard also requires certain new disclosures regardless of the election. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 (fiscal year ending June 30, 2020 “Fiscal 2020” for the Company), with early adoption permitted. In February 2016, the FASB issued ASU 2016-02, Leases . The new guidance supersedes existing guidance on accounting for leases in Topic 840 and is intended to increase the transparency and comparability of accounting for lease transactions. ASU 2016-02 requires most leases to be recognized on the balance sheet. Lessees will need to recognize a right-of-use asset and a lease liability for virtually all leases. The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Lessor accounting remains similar to the current model, but updated to align with certain changes to the lessee model and the new revenue recognition standard (ASU 2014-09). The ASU will require both quantitative and qualitative disclosures regarding key information about leasing arrangements. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 (Fiscal 2020 for the Company). Early adoption is permitted. The standard will require application of the new guidance at the beginning of the earliest comparative period presented using a modified retrospective transition, and provides for certain practical expedients. The Company established a project team and commenced an initial impact assessment process. To date, the Company has reviewed a sample of lessee and lessor arrangements and made preliminary assessments of the impact this standard will have on the consolidated financial statements. Although it is still assessing the impact of this standard, the Company expects the new guidance to significantly increase the reported assets and liabilities on the consolidated balance sheets. There are currently no plans to early adopt ASU 2016-02. Recently Adopted Accounting Pronouncements In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . This ASU requires an employer to report the service cost component of net periodic pension cost and net periodic postretirement cost in the same line item in the statement of operations as other compensation costs arising from services rendered by the related employees during the period. The other net cost components are required to be presented in the statement of operations separately from the service cost component and outside a subtotal of income from operations. Additionally, the line item used in the statement of operations to present the other net cost components must be disclosed in the notes to the financial statements. This ASU is effective for fiscal years beginning after December 15, 2017 (Fiscal 2019 for the Company), and interim periods within those fiscal years, and must be applied on a retrospective basis. The adoption did not result in a material impact to the condensed consolidated financial statements for either of the three months ended September 30, 2018 or 2017 and retrospective application was applied. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash . The new standard requires a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 (Fiscal 2019 for the Company). The retrospective adoption of this accounting standard did not have a material impact on its condensed consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classifications of Certain Cash Receipts and Cash Payments. The new standard provides guidance for eight changes with respect to how cash receipts and cash payments are classified in the statement of cash flows, with the objective of reducing diversity in practice. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2017 (Fiscal 2019 for the Company) . The retrospective adoption of this accounting standard did not have a material impact on its condensed consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASC 606”), which replaces numerous requirements in U.S. GAAP, including industry-specific requirements, and provides companies with a single revenue recognition model for recognizing revenue from certain contracts with customers. The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers and addressed accounting for costs to acquire and fulfill contracts. The standard does not impact the manner in which the Company accounts for revenue arrangements accounted for as leases. Effective July 1, 2018, the Company adopted the requirements of ASC 606 and used the full retrospective transition method. The full retrospective transition method requires the Company to restate each prior reporting period presented. The Company has implemented internal controls and system functionality to enable the preparation of financial information in accordance with ASC 606. The adoption of ASC 606 has an impact on the manner in which the Company recognizes revenue associated with dark fiber sales that include the transfer of title to certain network assets, which prior to ASC 606 was considered a sale of real estate or integral equipment. Under previous GAAP, the Company deferred the recognition of revenue on the sale of network infrastructure assets that were considered to be integral equipment if the Company had a substantial continuing involvement in the transferred asset. The consideration received in this type of arrangement had historically been amortized to revenue ratably over the period in which the Company had a substantial continuing involvement in the transferred asset. Under ASC 606 the asset transferred in this type of arrangement is derecognized from the balance sheet and the amount of the transaction price attributable to the asset being sold is recognized upon customer acceptance. This change had an impact of (decreasing)/increasing the revenue previously reported by the Company during the years ended June 30, 2018 and 2017 by ($1.5) million and $20.5 million, respectively. The full retrospective adoption of ASC 606 also resulted in increasing the previously reported operating costs during the year ended June 30, 2017 by $18.8 million, which represents the net book value of assets transferred to customers in these types of arrangements during Fiscal 2017. The assets transferred in these real estate sales had historically been included in property and equipment, net on the Company’s balance sheet. Upon the adoption of ASC 606, the net book value of these assets of $19.6 million was removed from the Company’s condensed consolidated balance sheet. The Company also derecognized from its June 30, 2018 balance sheet $1.5 million and $20.5 million in related deferred revenue, current and non-current, respectively, which represented the unamortized consideration received on these arrangements. An additional impact from the adoption of ASC 606 is the accounting for the incremental costs of acquiring new service contracts, including certain compensation expense with internal sales representatives. Under ASC 606, the Company capitalizes these incremental costs of obtaining customer contracts and amortizes the expense over the relevant contract term. In addition, the Company will assess its deferred contract cost asset for impairment on a periodic basis. Prior to the adoption of ASC 606, compensation paid to internal sales representatives for obtaining new service contracts was expensed as incurred. The impact of the retrospective adoption of ASC 606 resulted in an increase to selling, general and administrative expenses as previously reported by the Company during the years ended June 30, 2018 and 2017 by $1.1 million and $0.2 million, respectively. Additionally, the Company recorded an increase to the previously reported other current assets and other assets on the consolidated balance sheet as of June 30, 2018 of $7.1 million and $5.6 million, respectively, to reflect the deferred cost of acquiring service contracts that will be recognized in future periods over the relevant contract term.

BUSINESS AND BASIS OF PRESENT_3

BUSINESS AND BASIS OF PRESENTATION (Tables)	3 Months Ended
	Sep. 30, 2018
BUSINESS AND BASIS OF PRESENTATION
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The table below presents the impact the full retrospective adoption of ASC 606 had on the Company’s condensed statement of operations for the years ended June 30, 2018 and 2017 and each of the quarters of Fiscal 2018: Fiscal Year ended Quarter Ended (unaudited) June 30, June 30, September 30, December 31, March 31, June 30, (in millions) Revenue $ (1.5) $ 20.5 $ (0.4) $ (0.4) $ (0.4) $ (0.3) Operating costs — 18.8 — — — — Selling, general and administrative expenses 1.1 0.2 (0.2) 0.6 (0.3) 1.0 Depreciation and amortization (0.9) (0.7) (0.3) (0.3) (0.2) (0.1) Provision for income taxes (2.7) 0.8 — (2.5) — (0.2) Net income 1.0 1.4 0.1 1.8 0.1 (1.0) The table below presents the impact the full retrospective adoption of ASC 606 had on the Company’s consolidated balance sheet for the year ended June 30, 2018: As of June 30, 2018 As Previously Reported Effect of Adoption As Adjusted (in millions) Assets Other current assets $ 18.7 $ 7.1 $ 25.8 Property and equipment, net $ 5,447.2 $ (19.6) $ 5,427.6 Other assets $ 170.0 $ 5.6 $ 175.6 Liabilities Deferred revenue, current $ 164.4 $ (1.5) $ 162.9 Deferred revenue, non-current $ 1,096.8 $ (20.5) $ 1,076.3 Deferred income taxes, net $ 148.5 $ 3.9 $ 152.4 Stockholders' equity Accumulated deficit $ (384.7) $ 11.2 $ (373.5)

ACQUISITIONS AND DISPOSITIONS (

ACQUISITIONS AND DISPOSITIONS (Tables)	3 Months Ended
	Sep. 30, 2018
ACQUISITIONS AND DISPOSITIONS
Schedule of Acquisitions	The table below reflects the Company's estimates of the acquisition date fair values of the assets acquired and liabilities assumed from its Fiscal 2018 acquisitions: Neutral Path McLean Data Center Spread Networks Optic Zoo Networks Acquisition date April 17, 2018 April 4, 2018 February 28, 2018 January 18, 2018 (in millions) Cash $ 0.7 $ 9.2 $ 1.5 $ 1.4 Other current assets 0.2 — 4.2 0.4 Property and equipment 15.2 0.6 143.7 13.6 Intangibles 6.9 — 9.3 3.8 Goodwill 15.9 — 14.4 9.9 Deferred tax assets 1.5 — 7.1 — Other assets — — 1.4 0.2 Total assets acquired 40.4 9.8 181.6 29.3 Current liabilities 0.6 1.6 2.6 0.6 Deferred revenue 5.8 — 27.2 1.2 Deferred tax liability, net — — — 1.3 Other liabilities — 8.2 19.8 — Total liabilities assumed 6.4 9.8 49.6 3.1 Net assets acquired 34.0 — 132.0 26.2 Less cash acquired (0.7) (9.2) (1.5) (1.4) Net consideration paid $ 33.3 $ (9.2) $ 130.5 $ 24.8
Assets and related liabilities held for sale	June 30, 2018 (in millions) Assets held for sale: Property and equipment, net $ 35.7 Goodwill 5.2 Other assets 0.9 Total assets held for sale $ 41.8 Liabilities associated with assets held for sale: Deferred tax liability, net $ 5.1 Other liabilities 1.0 Total liabilities associated with assets held for sale $ 6.1

GOODWILL (Tables)

GOODWILL (Tables)	3 Months Ended
	Sep. 30, 2018
GOODWILL
Schedule Of Goodwill	Product Group As of June 30, 2018 Adjustments to Fiscal 2018 Foreign Currency As of September 30, 2018 (in millions) Fiber Solutions $ 756.4 $ (6.1) $ (0.9) $ 749.4 Waves 194.8 (0.9) (0.8) 193.1 Sonet 87.6 — — 87.6 Ethernet 104.2 (0.2) — 104.0 Live Video 3.3 — — 3.3 WANs 179.3 — 0.1 179.4 zColo 260.1 — (0.1) 260.0 Cloud 65.3 — — 65.3 Cloudlink 13.5 — — 13.5 Allstream 39.0 — — 39.0 Other 15.6 — — 15.6 Total $ 1,719.1 $ (7.2) $ (1.7) $ 1,710.2

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	3 Months Ended
	Sep. 30, 2018
INTANGIBLE ASSETS
Schedule of Intangible Assets, Excluding Goodwill	Gross Carrying Amount Accumulated Net (in millions) September 30, 2018 Finite-Lived Intangible Assets Customer relationships $ 1,600.9 $ (429.3) $ 1,171.6 Underlying rights and other 3.4 (0.9) 2.5 Total 1,604.3 (430.2) 1,174.1 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying rights and other 14.9 — 14.9 Total $ 1,622.7 $ (430.2) $ 1,192.5 June 30, 2018 Finite-Lived Intangible Assets Customer relationships $ 1,597.0 $ (405.6) $ 1,191.4 Underlying rights and other 2.7 (0.6) 2.1 Total 1,599.7 (406.2) 1,193.5 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying rights and other 15.1 — 15.1 Total $ 1,618.3 $ (406.2) $ 1,212.1

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	3 Months Ended
	Sep. 30, 2018
LONG-TERM DEBT
Schedule of Debt	Date of Outstanding as of Issuance or most Maturity Interest Interest Rate September 30, June 30, (in millions) Term Loan Facility due 2021 Jan 2017 Jan 2021 Monthly LIBOR +2.00% $ 492.5 $ 493.8 B-2 Term Loan Facility Feb 2018 Jan 2024 Monthly LIBOR +2.25% 1,269.3 1,269.3 6.00% Senior Unsecured Notes Jan & Mar 2015 Apr 2023 Apr/Oct 6.00% 1,430.0 1,430.0 6.375% Senior Unsecured Notes May 2015 & Apr 2016 May 2025 May/Nov 6.375% 900.0 900.0 5.75% Senior Unsecured Notes Jan, Apr & Jul 2017 Jan 2027 Jan/Jul 5.75% 1,650.0 1,650.0 Total obligations 5,741.8 5,743.1 Unamortized premium, net 11.6 11.6 Unamortized debt issuance costs (57.1) (59.6) Carrying value of debt 5,696.3 5,695.1 Less current portion (5.0) (5.0) Total long-term debt, less current portion $ 5,691.3 $ 5,690.1

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Sep. 30, 2018
INCOME TAXES
Schedule Of Reconciliation Of Income Tax Provision	Three months ended September 30, 2018 2017 (in millions) Expected expense at the statutory rate $ 8.9 $ 10.0 Increase/(decrease) due to: Non-deductible stock-based compensation 1.1 1.5 State income taxes benefit, net of federal benefit 1.5 0.6 Transaction costs not deductible for tax purposes 0.3 0.1 Change in tax rates (0.1) — Foreign tax rate differential 0.2 (2.2) U.S. Tax Reform 7.6 — Foreign entities with valuation allowance (0.3) (5.7) Other, net 1.3 1.1 Provision for income taxes $ 20.5 $ 5.4
Effect of U.S. Tax Reform on Tax Expense	Through June 30, 2018: Tax Expense recognized Through September 30, 2018: (in millions) Change in statutory tax rate, U.S. only $ (16.3) $ 6.2 $ (10.1) Changes to indefinite reinvestment assertion 0.8 — 0.8 Repatriation Tax 37.6 1.4 39.0 Net impacts of U.S. Tax Reform $ 22.1 $ 7.6 $ 29.7

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Sep. 30, 2018
Schedule of Employee Service Share-based Compensation Allocation of Recognized Period Costs	Three Months Ended September 30, 2018 2017 (in millions) Included in: Operating costs $ 2.7 $ 3.2 Selling, general and administrative expenses 24.0 24.6 Total stock-based compensation expense $ 26.7 $ 27.8 Part A restricted stock units $ 23.3 $ 22.2 Part B restricted stock units 2.9 5.1 Part C restricted stock units 0.5 0.5 Total stock-based compensation expense $ 26.7 $ 27.8
Summary Of Part B RSU Issuance	During the three months ended September 30, 2018 Part B RSUs granted 58,418 Maximum eligible shares of the Company's common stock 403,084 Grant date fair value per Part B RSU $ 64.41 Units converted to Company's common stock at vesting date n/a During the three months ended June 30, 2018 March 31, 2018 December 31, 2017 September 30, 2017 Part B RSUs granted 78,123 77,218 82,556 163,960 Maximum eligible shares of the Company's common stock 539,049 532,804 569,636 590,256 Grant date fair value per Part B RSU $ 74.44 $ 52.47 $ 45.10 $ 19.06 Units converted to Company's common stock at vesting date n/a n/a n/a 54,671
Part A Restricted Stock Units [Member]
Summary Of Restricted Stock Units Activity	Number of Part A Weighted average Weighted average Outstanding at July 1, 2018 2,246,495 $ 35.08 6.4 Granted 763,558 34.48 Vested (686,302) 34.70 Forfeited (120,057) n/a Outstanding at September 30, 2018 2,203,694 $ 34.84 6.1
Part B Restricted Stock Units [Member]
Summary Of Restricted Stock Units Activity	Number of Part B Weighted average Weighted average Outstanding at July 1, 2018 185,775 $ 57.19 8.9 Granted 58,418 64.41 Vested — — Forfeited — n/a Outstanding at September 30, 2018 244,193 $ 58.92 7.4

EMPLOYEE BENEFITS (Tables)

EMPLOYEE BENEFITS (Tables)	3 Months Ended
	Sep. 30, 2018
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of net periodic (benefit) cost of the defined benefit pension and postretirement medical included in SG&A expenses	Pension Plans Three months ended ( in millions) Service cost $ 0.8 Interest cost 0.9 Expected return on plan assets (1.4) Amortization of service cost from earlier periods 0.2 Gain on curtailment (1) (0.4) Net periodic pension benefit cost $ 0.1 (1) During the three months ended September 30, 2018, the Company approved an amendment to the defined benefit pension plan freezing benefit accruals for certain members of the pension plan as of September 30, 2018. The plan freeze had an immaterial impact to the financial statements for the period ended September 30, 2018.
OPEB Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of net periodic (benefit) cost of the defined benefit pension and postretirement medical included in SG&A expenses	OPEB Plans Three months ended (in millions) Interest cost 0.1 Net periodic pension benefit cost $ 0.1

REVENUE AND CONTRACT COSTS (Tab

REVENUE AND CONTRACT COSTS (Tables)	3 Months Ended
	Sep. 30, 2018
REVENUE AND CONTRACT COSTS
Schedule of estimate of the remaining transaction price of fixed fee, non-lease revenue arrangements to be recognized in the future periods	Nine months ended Year ended June 30, June 30, 2020 2021 2022 2023 Thereafter Total (in millions) Reportable Segment Fiber Solutions $ 8.8 $ 1.1 $ 0.3 $ — $ — $ — $ 10.2 Transport 313.5 236.3 112.6 36.8 16.5 20.6 736.3 Enterprise Networks 180.3 133.1 58.8 14.9 5.0 0.7 392.8 zColo 25.6 20.3 10.4 5.1 2.8 3.9 68.1 Allstream 115.4 49.6 14.6 2.5 0.6 0.1 182.8 Total $ 643.6 $ 440.4 $ 196.7 $ 59.3 $ 24.9 $ 25.3 $ 1,390.2
Schedule of customer receivables, contract assets and contract liabilities	September 30, 2018 June 30, 2018 (in millions) Customer receivable, net (1) $ 160.0 $ 164.0 Contract liabilities (1) $ 64.0 $ 68.9 (1) - Amounts do not include balances associated with lease revenue from the Company’s Fiber Solutions and zColo segments.

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	3 Months Ended
	Sep. 30, 2018
RELATED PARTY TRANSACTIONS
Revenue and Expense Transactions Recognized	The following table represents the revenue and expense transactions the Company recorded with Inteliquent for the prior period: Three Months Ended September 30, 2017 (in millions) Revenues $ 1.9 Operating costs $ 0.6

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	3 Months Ended
	Sep. 30, 2018
SEGMENT REPORTING
Summary of Financial Information by Segments	As of and for the three months ended September 30, 2018 Fiber Transport Enterprise zColo Allstream Other Corp/ Total (in millions) Revenue from external customers $ 220.9 $ 168.4 $ 82.6 $ 59.0 $ 105.0 $ 5.2 $ — $ 641.1 Segment Adjusted EBITDA 178.4 57.1 34.0 28.0 20.8 1.1 — 319.4 Total assets 4,991.0 1,878.0 755.9 1,038.4 427.3 32.4 187.3 9,310.3 Capital expenditures 99.1 40.4 13.2 25.2 4.6 — — 182.5 As of and for the three months ended September 30, 2017 Fiber Transport Enterprise zColo Allstream Other Corp/ Total (in millions) Revenue from external customers $ 198.4 $ 168.0 $ 85.4 $ 58.4 $ 127.7 $ 5.2 $ — $ 643.1 Segment Adjusted EBITDA 159.7 60.3 33.4 28.6 33.2 1.3 (0.1) 316.4 Capital expenditures 107.3 44.3 10.4 27.9 3.5 — — 193.4 As of June 30, 2018 Fiber Transport Enterprise Networks zColo Allstream Other Corp/ Total (in millions) Total assets $ 4,937.3 1,870.9 754.6 1,032.4 465.5 33.4 111.2 $ 9,205.3
Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations	For the three months ended September 30, 2018 2017 (in millions) Total Segment Adjusted EBITDA $ 319.4 $ 316.4 Interest expense (82.2) (73.6) Depreciation and amortization expense (167.8) (183.8) Transaction costs (0.7) (8.3) Stock-based compensation (26.7) (27.8) Loss on extinguishment of debt — (4.9) Foreign currency (loss)/gain on intercompany loans (4.6) 10.8 Gain on business disposition 5.5 — Non-cash loss on investments (0.3) (0.1) Income from operations before income taxes $ 42.6 $ 28.7

CONDENSED CONSOLIDATING FINAN_2

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables)	3 Months Ended
	Sep. 30, 2018
CONDENSED CONSOLIDATING FINANCIAL INFORMATION
Schedule Of Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheets (Unaudited) September 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Assets Current assets Cash and cash equivalents $ 224.2 $ 7.4 $ 121.6 $ — 353.2 Trade receivables, net of allowance 134.4 0.8 92.0 — 227.2 Prepaid expenses 49.3 0.1 18.8 — 68.2 Other current assets 65.4 — (37.7) — 27.7 Total current assets 473.3 8.3 194.7 — 676.3 Property and equipment, net 4,779.7 — 745.0 — 5,524.7 Intangible assets, net 1,046.6 8.7 137.2 — 1,192.5 Goodwill 1,520.3 14.6 175.3 — 1,710.2 Deferred income taxes, net — — 36.2 — 36.2 Other assets 134.9 — 35.5 — 170.4 Related party receivable 365.9 — — (365.9) — Investment in subsidiary 684.9 — — (684.9) — Total assets $ 9,005.6 $ 31.6 $ 1,323.9 $ (1,050.8) $ 9,310.3 Liabilities and member's equity Current liabilities Accounts payable $ 24.5 $ 0.1 $ 17.3 $ — $ 41.9 Accrued liabilities 235.4 0.9 77.9 — 314.2 Accrued interest 85.4 — — — 85.4 Current portion of long-term debt 5.0 — — — 5.0 Capital lease obligations, current 9.0 — 1.5 — 10.5 Deferred revenue, current 136.9 0.1 34.6 — 171.6 Total current liabilities 496.2 1.1 131.3 — 628.6 Long-term debt, non-current 5,691.3 — — — 5,691.3 Related party debt, long-term — — 365.9 (365.9) — Capital lease obligation, non-current 133.3 — 9.6 — 142.9 Deferred revenue, non-current 987.8 — 97.8 — 1,085.6 Deferred income taxes, net 134.4 — 33.1 — 167.5 Other long-term liabilities 20.5 — 31.8 — 52.3 Total liabilities 7,463.5 1.1 669.5 (365.9) 7,768.2 — Member's equity Member's interest 1,911.8 15.1 546.8 (571.0) 1,902.7 Accumulated other comprehensive loss (9.2) — (9.2) 9.2 (9.2) Accumulated deficit (360.5) 15.4 116.8 (123.1) (351.4) Total member's equity 1,542.1 30.5 654.4 (684.9) 1,542.1 Total liabilities and member's equity $ 9,005.6 $ 31.6 $ 1,323.9 $ (1,050.8) $ 9,310.3 Condensed Consolidating Balance Sheets (Unaudited) June 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Assets Current assets Cash and cash equivalents $ 138.1 $ 5.9 $ 112.0 $ — $ 256.0 Trade receivables, net of allowance 134.9 2.7 98.0 — 235.6 Prepaid expenses 52.0 0.2 21.9 — 74.1 Other current assets 56.5 — (30.7) — 25.8 Assets held for sale 41.8 — — — 41.8 Total current assets 423.3 8.8 201.2 — 633.3 Property and equipment, net 4,698.9 — 728.7 — 5,427.6 Intangible assets, net 1,064.6 9.2 138.3 — 1,212.1 Goodwill 1,526.6 14.6 177.9 — 1,719.1 Deferred income taxes, net — — 37.6 — 37.6 Other assets 141.1 — 34.5 — 175.6 Related party receivable 362.7 — — (362.7) — Investment in subsidiary 661.0 — — (661.0) — Total assets $ 8,878.2 $ 32.6 $ 1,318.2 $ (1,023.7) $ 9,205.3 Liabilities and member's equity — Current liabilities Accounts payable $ 24.5 $ 0.1 $ 21.3 $ — $ 45.9 Accrued liabilities 237.8 0.7 76.6 — 315.1 Accrued interest 72.6 — — — 72.6 Current portion of long-term debt 5.0 — — — 5.0 Capital lease obligations, current 10.6 — 1.3 — 11.9 Deferred revenue, current 126.3 0.2 36.4 — 162.9 Liabilities associated with assets held for sale 6.1 — — — 6.1 Total current liabilities 482.9 1.0 135.6 — 619.5 Long-term debt, non-current 5,690.1 — — — 5,690.1 Related party debt, long-term — — 362.7 (362.7) — Capital lease obligation, non-current 111.4 — 10.2 — 121.6 Deferred revenue, non-current 963.8 — 112.5 — 1,076.3 Deferred income taxes, net 120.0 — 32.4 — 152.4 Other long-term liabilities 22.4 — 35.4 — 57.8 Total liabilities 7,390.6 1.0 688.8 (362.7) 7,717.7 — — — Member's equity — — — Member's interest 1,885.7 16.8 537.3 (563.2) 1,876.6 Accumulated other comprehensive loss (15.5) — (15.5) 15.5 (15.5) Accumulated deficit (382.6) 14.8 107.6 (113.3) (373.5) Total member's equity 1,487.6 31.6 629.4 (661.0) 1,487.6 Total liabilities and member's equity $ 8,878.2 $ 32.6 $ 1,318.2 $ (1,023.7) $ 9,205.3
Schedule Of Condensed Consolidating Statements Of Operations	Condensed Consolidating Statements of Comprehensive Income For the three months ended September 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Revenue $ 498.6 $ 5.2 $ 137.3 $ — $ 641.1 Operating costs and expenses — — — — Operating costs (excluding depreciation amortization and including stock-based compensation) 160.7 3.7 64.0 — 228.4 Selling, general and administrative expenses (including stock-based compensation) 91.3 0.4 30.4 — 122.1 Depreciation and amortization 146.0 0.5 21.3 — 167.8 Total operating costs and expenses 398.0 4.6 115.7 — 518.3 Operating income 100.6 0.6 21.6 — 122.8 Other expenses Interest expense (76.5) — (5.7) — (82.2) Foreign currency loss on intercompany loans (2.2) — (2.4) — (4.6) Other expense 6.2 — 0.4 — 6.6 Equity in net earnings of subsidiaries 9.8 — — (9.8) — Total other expense, net (62.7) — (7.7) (9.8) (80.2) Income/(loss) from operations before income taxes 37.9 0.6 13.9 (9.8) 42.6 Provision/(benefit) for income taxes 15.8 — 4.7 — 20.5 Net income/(loss) 22.1 0.6 9.2 (9.8) 22.1 Other comprehensive income, net of income taxes 6.3 — 6.3 (6.3) 6.3 Comprehensive income $ 28.4 $ 0.6 $ 15.5 $ (16.1) $ 28.4 Condensed Consolidating Statements of Comprehensive Income For the three months ended September 30, 2017 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Eliminations Total (in millions) Revenue $ 487.8 $ 5.1 $ 150.2 $ — $ 643.1 Operating costs and expenses — — — — Operating costs (excluding depreciation amortization and including stock-based compensation) 161.1 3.8 70.8 — 235.7 Selling, general and administrative expenses (including stock-based compensation) 92.8 0.3 35.0 — 128.1 Depreciation and amortization 154.6 0.5 28.7 — 183.8 Total operating costs and expenses 408.5 4.6 134.5 — 547.6 Operating income 79.3 0.5 15.7 — 95.5 Other expenses Interest expense (68.0) — (5.6) — (73.6) Loss on extinguishment of debt (4.9) — — — (4.9) Foreign currency loss on intercompany loans 5.3 — 5.5 — 10.8 Other expense 0.2 — 0.7 — 0.9 Equity in net earnings of subsidiaries 17.0 — — (17.0) — Total other expense, net (50.4) — 0.6 (17.0) (66.8) Income/(loss) from operations before income taxes 28.9 0.5 16.3 (17.0) 28.7 Provision/(benefit) for income taxes 5.6 — (0.2) — 5.4 Net income/(loss) 23.3 0.5 16.5 (17.0) 23.3 Other comprehensive income, net of income taxes 22.1 — 22.1 (22.1) 22.1 Comprehensive income $ 45.4 $ 0.5 $ 38.6 $ (39.1) $ 45.4
Schedule Of Condensed Consolidating Statements Of Cash Flows	Condensed Consolidating Statements of Cash Flows For the three months ended September 30, 2018 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Total (in millions) Net cash provided by operating activities $ 212.0 $ 3.1 $ 26.7 $ 241.8 Cash flows from investing activities: Purchases of property and equipment (150.5) — (32.0) (182.5) Proceeds from sale of SRT, net of cash held in escrow 39.0 — — 39.0 Net cash used in investing activities (111.5) — (32.0) (143.5) Cash flows from financing activities: Principal payments on long-term debt (1.3) — — (1.3) Principal repayments on capital lease obligations (1.6) — (0.3) (1.9) Payments to repurchase ZGH common stock (0.2) — — (0.2) Contributions to parent (8.7) (1.6) 10.3 — Cash paid for Santa Clara acquisition (3.3) — — (3.3) Net cash provided by financing activities (15.1) (1.6) 10.0 (6.7) Effect of changes in foreign exchange rates on cash — — 2.2 2.2 Net increase in cash, cash equivalents and restricted cash 85.4 1.5 6.9 93.8 Cash, cash equivalents and restricted cash, beginning of year 142.7 5.9 112.0 260.6 Cash, cash equivalents and restricted cash, end of period $ 228.1 $ 7.4 $ 118.9 $ 354.4 Condensed Consolidating Statements of Cash Flows For the three months ended September 30, 2017 Zayo Group, LLC Guarantor Non-Guarantor (Issuer) Subsidiaries Subsidiaries Total (in millions) Net cash provided by operating activities $ 213.6 $ 3.6 $ 51.6 $ 268.8 — — — Cash flows from investing activities: — — — Purchases of property and equipment (176.3) — (17.1) (193.4) Net cash used in investing activities (176.3) — (17.1) (193.4) Cash flows from financing activities: Proceeds from debt 312.8 — — 312.8 Principal payments on long-term debt (311.9) — — (311.9) Principal repayments on capital lease obligations (1.6) — (0.1) (1.7) Payment of debt issuance costs (3.4) — — (3.4) Contributions to parent 1.1 (1.1) — — Cash paid for Santa Clara acquisition (1.3) — — (1.3) Net cash provided by financing activities (4.3) (1.1) (0.1) (5.5) Effect of changes in foreign exchange rates on cash — — 0.6 0.6 Net increase in cash, cash equivalents and restricted cash 33.0 2.5 35.0 70.5 Cash, cash equivalents and restricted cash, beginning of year 101.1 2.1 121.3 224.5 Cash, cash equivalents and restricted cash, end of period $ 134.1 $ 4.6 $ 156.3 $ 295.0

BUSINESS AND BASIS OF PRESENT_4

BUSINESS AND BASIS OF PRESENTATION (Impact of ASC 606) (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017
Recently Issued Accounting Pronouncements
Revenue	$ 641.1	$ 643.1
Operating costs (excluding depreciation amortization and including stock-based compensation)	228.4	235.7
Selling, general and administrative expenses (including stock-based compensation)	122.1	128.1
Depreciation and amortization	167.8	183.8
Provision for income taxes	20.5	5.4
Net income	22.1	$ 23.3
Assets
Other current assets	27.7						$ 25.8
Property and equipment, net	5,524.7						5,427.6
Other assets	170.4						175.6
Liabilities
Deferred revenue, current	171.6						162.9
Deferred revenue, non-current	1,085.6						1,076.3
Deferred income taxes, net	167.5						152.4
Stockholders' equity
Accumulated deficit	$ (351.4)						(373.5)
Accounting Standards Update 2014-09 [Member]
Recently Issued Accounting Pronouncements
Revenue			$ (0.3)	$ (0.4)	$ (0.4)	$ (0.4)	(1.5)	$ 20.5
Operating costs (excluding depreciation amortization and including stock-based compensation)								18.8
Selling, general and administrative expenses (including stock-based compensation)			1	(0.3)	0.6	(0.2)	1.1	0.2
Depreciation and amortization			(0.1)	(0.2)	(0.3)	(0.3)	(0.9)	(0.7)
Provision for income taxes			(0.2)		(2.5)		(2.7)	0.8
Net income			$ (1)	$ 0.1	$ 1.8	$ 0.1	1	$ 1.4
Accounting Standards Update 2014-09 [Member] | As Previously Reported
Assets
Other current assets							18.7
Property and equipment, net							5,447.2
Other assets							170
Liabilities
Deferred revenue, current							164.4
Deferred revenue, non-current							1,096.8
Deferred income taxes, net							148.5
Stockholders' equity
Accumulated deficit							(384.7)
Accounting Standards Update 2014-09 [Member] | Effect of Adoption
Assets
Other current assets							7.1
Property and equipment, net							(19.6)
Other assets							5.6
Liabilities
Deferred revenue, current							(1.5)
Deferred revenue, non-current							(20.5)
Deferred income taxes, net							3.9
Stockholders' equity
Accumulated deficit							$ 11.2

ACQUISITIONS AND DISPOSITIONS_2

ACQUISITIONS AND DISPOSITIONS (Narrative) (Details) $ in Millions, $ in Millions	Apr. 17, 2018USD ($)	Feb. 28, 2018USD ($)	Jan. 18, 2018CAD ($)	Jan. 18, 2018USD ($)	Feb. 28, 2018USD ($)	Sep. 30, 2018CAD ($)item	Sep. 30, 2018USD ($)item	Jun. 30, 2018USD ($)
Business Acquisition [Line Items]
Number of business combinations completed since inception | item						45	45
Acquisition related costs							$ 0.7	$ 8.3
Neutral Path
Business Acquisition [Line Items]
Business acquisition purchase price	$ 33.3
Purchase price held in escrow							4
Deferred tax assets, net	$ 1.5
Spread Networks
Business Acquisition [Line Items]
Business acquisition purchase price		$ 130.5			$ 130.5
Purchase price held in escrow							0.6
Deferred tax assets, net		$ 7.1			$ 7.1
Optic Zoo Networks
Business Acquisition [Line Items]
Business acquisition purchase price			$ 30.9	$ 24.8
Purchase price held in escrow						$ 3.2	$ 2.5

ACQUISITIONS AND DISPOSITIONS_3

ACQUISITIONS AND DISPOSITIONS (Schedule of Acquisition) (Details) $ in Millions, $ in Millions	Apr. 17, 2018USD ($)	Apr. 04, 2018USD ($)	Feb. 28, 2018USD ($)	Jan. 18, 2018CAD ($)	Jan. 18, 2018USD ($)	Feb. 28, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)
Business Acquisition [Line Items]
Goodwill							$ 1,710.2	$ 1,719.1
Neutral Path
Business Acquisition [Line Items]
Cash	$ 0.7
Other current assets	0.2
Property and equipment	15.2
Intangibles	6.9
Goodwill	15.9
Deferred tax assets, net	1.5
Total assets acquired	40.4
Current liabilities	0.6
Deferred revenue	5.8
Total liabilities assumed	6.4
Net assets acquired	34
Net consideration paid	$ 33.3
McLean Data Center
Business Acquisition [Line Items]
Cash		$ 9.2
Property and equipment		0.6
Total assets acquired		9.8
Current liabilities		1.6
Other liabilities		8.2
Total liabilities assumed		9.8
Net consideration paid		$ (9.2)
Spread Networks
Business Acquisition [Line Items]
Cash			$ 1.5			$ 1.5
Other current assets			4.2			4.2
Property and equipment			143.7			143.7
Intangibles			9.3			9.3
Goodwill			14.4			14.4
Deferred tax assets, net			7.1			7.1
Other assets			1.4			1.4
Total assets acquired			181.6			181.6
Current liabilities			2.6			2.6
Deferred revenue			27.2			27.2
Other liabilities			19.8			19.8
Total liabilities assumed			49.6			49.6
Net assets acquired			132			132
Net consideration paid			$ 130.5			$ 130.5
Optic Zoo Networks
Business Acquisition [Line Items]
Cash					$ 1.4
Other current assets					0.4
Property and equipment					13.6
Intangibles					3.8
Goodwill					9.9
Other assets					0.2
Total assets acquired					29.3
Current liabilities					0.6
Deferred revenue					1.2
Deferred tax liabilities, net					1.3
Total liabilities assumed					3.1
Net assets acquired					26.2
Net consideration paid				$ 30.9	$ 24.8

ACQUISITIONS AND DISPOSITIONS_4

ACQUISITIONS AND DISPOSITIONS (Scott-Rice Telephone Co.) (Details) - Scott-Rice Telephone - USD ($) $ in Millions	1 Months Ended	3 Months Ended	4 Months Ended	12 Months Ended
	Jul. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2018
Dispositions
Consideration	$ 42.2
Purchase price held in escrow		$ 3.2
Pre-tax gain on sale	$ 5.5
Pre-tax income (loss)			$ 2.9	$ (1.6)
Assets held for sale:
Property and equipment, net				35.7
Goodwill				5.2
Other assets				0.9
Total assets held for sale				41.8
Liabilities associated with assets held for sale:
Deferred tax liability, net				5.1
Other liabilities				1
Total liabilities associated with assets held for sale				$ 6.1

GOODWILL (Schedule Of Goodwill)

GOODWILL (Schedule Of Goodwill) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)
Goodwill [Line Items]
Goodwill, beginning Balance	$ 1,719.1
Adjustments to Prior Period Acquisitions	(7.2)
Foreign Currency Translation and Other	(1.7)
Goodwill, ending balance	1,710.2
Fiber Solutions [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	756.4
Adjustments to Prior Period Acquisitions	(6.1)
Foreign Currency Translation and Other	(0.9)
Goodwill, ending balance	749.4
Waves [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	194.8
Adjustments to Prior Period Acquisitions	(0.9)
Foreign Currency Translation and Other	(0.8)
Goodwill, ending balance	193.1
Sonet [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	87.6
Goodwill, ending balance	87.6
Ethernet [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	104.2
Adjustments to Prior Period Acquisitions	(0.2)
Goodwill, ending balance	104
Live Video [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	3.3
Goodwill, ending balance	3.3
WANs [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	179.3
Foreign Currency Translation and Other	0.1
Goodwill, ending balance	179.4
zColo [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	260.1
Foreign Currency Translation and Other	(0.1)
Goodwill, ending balance	260
Cloud [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	65.3
Goodwill, ending balance	65.3
Cloudlink [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	13.5
Goodwill, ending balance	13.5
Allstream, Inc. [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	39
Goodwill, ending balance	39
Other [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	15.6
Goodwill, ending balance	$ 15.6

INTANGIBLE ASSETS (Schedule of

INTANGIBLE ASSETS (Schedule of Identifiable Acquisition Related Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	$ 1,604.3	$ 1,599.7
Total Intangible Assets, Gross	1,622.7	1,618.3
Accumulated Amortization	(430.2)	(406.2)
Total Net	1,174.1	1,193.5
Intangible Assets, Net	1,192.5	1,212.1
Certifications [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	3.5	3.5
Underlying Rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	14.9	15.1
Customer relationships [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	1,600.9	1,597
Accumulated Amortization	(429.3)	(405.6)
Total Net	1,171.6	1,191.4
Underlying rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	3.4	2.7
Accumulated Amortization	(0.9)	(0.6)
Total Net	$ 2.5	$ 2.1

LONG-TERM DEBT (Summary of Long

LONG-TERM DEBT (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions	Jul. 22, 2016	Jan. 15, 2016	Sep. 30, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Debt obligations			$ 5,741.8	$ 5,743.1
Unamortized premium			11.6	11.6
Unamortized debt issuance costs			(57.1)	(59.6)
Carrying value of debt			5,696.3	5,695.1
Less current portion			(5)	(5)
Long-term debt, less current portion			$ 5,691.3	5,690.1
6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate			6.00%
6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate			6.375%
5.75% Senior Unsecured Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate			5.75%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Carrying value of debt			$ 1,750.6	1,751.3
Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Debt obligations			492.5	493.8
Term Loan Facility B2 [Member]
Debt Instrument [Line Items]
Debt obligations			1,269.3	1,269.3
Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt obligations			$ 1,430	$ 1,430
Interest rate			6.00%	6.00%
Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt obligations			$ 900	$ 900
Interest rate			6.375%	6.375%
Unsecured Debt [Member] | 5.75% Senior Unsecured Notes due 2027 [Member]
Debt Instrument [Line Items]
Debt obligations			$ 1,650	$ 1,650
Interest rate			5.75%	5.75%
LIBOR [Member]
Debt Instrument [Line Items]
Basis spread		3.50%
Interest rate		1.00%
LIBOR [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Basis spread	2.75%
LIBOR [Member] | Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Basis spread			2.00%	2.00%
LIBOR [Member] | Term Loan Facility B2 [Member]
Debt Instrument [Line Items]
Basis spread			2.25%	2.25%

LONG-TERM DEBT (Narrative) (Det

LONG-TERM DEBT (Narrative) (Details) - USD ($)

Feb. 26, 2018

Dec. 22, 2017

Jul. 20, 2017

Jul. 05, 2017

Apr. 10, 2017

Jan. 19, 2017

Jul. 22, 2016

Apr. 14, 2016

Jan. 15, 2016

May 06, 2015

Sep. 30, 2018

Sep. 30, 2017

Jun. 30, 2018

Jan. 27, 2017

Mar. 09, 2015

Jan. 23, 2015

Debt Instrument [Line Items]

Line of credit facility maximum borrowing capacity

$ 8,100,000

Interest rate decrease (basis point)

(0.10%)

Debt obligations

5,741,800,000

$ 5,743,100,000

Amended term loan facility

$ 400,000,000

Debt extinguishment costs

$ 4,900,000

Term loan priced percent

99.00%

Redemption of debt

$ 1,300,000

$ 311,900,000

Secured debt ratio

4.50

Total indebtedness ratio

6

Loss on extinguishment of debt

(4,900,000)

Debt instrument issuance price percentage

104.00%

Proceeds from debt

$ 150,000,000

$ 310,700,000

$ 312,800,000

10.125% Senior Notes due 2020 [Member]

Debt Instrument [Line Items]

Interest rate

10.125%

Redemption of debt

$ 325,600,000

Redemption premium and accrued interest included in redemption amount

20,300,000

6.00% Senior Notes due 2023 [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 730,000,000

$ 700,000,000

Interest rate

6.00%

6.375% Senior Notes due 2025 [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 550,000,000

$ 350,000,000

Interest rate

6.375%

Debt instrument issuance price percentage

97.76%

5.75% Senior Unsecured Notes due 2027 [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 300,000,000

$ 550,000,000

$ 800,000,000

Interest rate

5.75%

Debt instrument issuance price percentage

104.25%

Proceeds from debt

$ 310,700,000

B-2 Term Loan Tranche [Member]

Debt Instrument [Line Items]

Facility interest rate

2.25%

LIBOR [Member]

Debt Instrument [Line Items]

Interest rate

1.00%

Facility interest rate

3.50%

Revolver [Member]

Debt Instrument [Line Items]

Outstanding letters of credit increased

$ 50,000,000

Secured debt ratio

5.25

Percentage of excess revolver committed to debt payments

35.00%

Effective Interest rates (in percent)

4.00%

3.80%

Available borrowing capacity

$ 441,900,000

Letters of Credit [Member]

Debt Instrument [Line Items]

Unused commitment, percentage

0.25%

Revolver line of credit

8,100,000

Letters of Credit [Member] | Minimum [Member]

Debt Instrument [Line Items]

Unused commitment, percentage

0.25%

Fee on outstanding letters of credit based upon leverage ratio

1.00%

Letters of Credit [Member] | Maximum [Member]

Debt Instrument [Line Items]

Unused commitment, percentage

0.375%

Fee on outstanding letters of credit based upon leverage ratio

1.75%

Letters of Credit [Member] | LIBOR [Member] | Minimum [Member]

Debt Instrument [Line Items]

Facility interest rate

1.00%

Letters of Credit [Member] | LIBOR [Member] | Maximum [Member]

Debt Instrument [Line Items]

Facility interest rate

1.75%

Secured Debt [Member] | Revolver [Member]

Debt Instrument [Line Items]

Revolver line of credit

$ 0

Term Loan Facility [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 1,850,000,000

Interest rate decrease (basis point)

(0.75%)

Repriced percentage

99.75%

Redemption of debt

$ 196,000,000

Weighted average interest rates (including margins)

4.40%

4.30%

Amount outstanding

$ 1,761,800,000

Term Loan Facility [Member] | Amendment and Restatement Agreement [Member]

Debt Instrument [Line Items]

Line of credit facility maximum borrowing capacity

$ 450,000,000

Quarterly principal payments per quarter, in basis points

0.25%

Percentage of excess cash flows committed to debt payments

50.00%

Term Loan Facility [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 500,000,000

$ 500,000,000

Term Loan Facility [Member] | Tranche Two [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 1,350,000,000

Interest rate decrease (basis point)

(0.25%)

Term Loan Facility [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Facility interest rate

2.75%

Term Loan Facility [Member] | LIBOR [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

(0.75%)

Facility interest rate

2.00%

2.00%

Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member]

Debt Instrument [Line Items]

Facility interest rate

1.00%

Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Facility interest rate

0.00%

Incremental Term Loan [Member]

Debt Instrument [Line Items]

Line of credit facility maximum borrowing capacity

150,000,000

Proceeds from debt

150,000,000

Incremental Term Loan [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Maturity period from incurrence

4 years

Debt obligations

$ 150,000,000

Incremental Term Loan [Member] | Tranche Two [Member]

Debt Instrument [Line Items]

Maturity period from incurrence

7 years

Incremental Term Loan [Member] | LIBOR [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Facility interest rate

2.25%

Incremental Term Loan [Member] | LIBOR [Member] | Tranche Two [Member]

Debt Instrument [Line Items]

Facility interest rate

2.50%

Incremental Term Loan [Member] | LIBOR [Member] | Minimum [Member]

Debt Instrument [Line Items]

Facility interest rate

1.00%

Incremental Term Loan [Member] | LIBOR [Member] | Minimum [Member] | Tranche One [Member]

Debt Instrument [Line Items]

Facility interest rate

1.00%

Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member]

Debt Instrument [Line Items]

Interest rate

6.00%

6.00%

Debt obligations

$ 1,430,000,000

$ 1,430,000,000

Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member]

Debt Instrument [Line Items]

Interest rate

6.375%

6.375%

Debt obligations

$ 900,000,000

$ 900,000,000

Unsecured Debt [Member] | 5.75% Senior Unsecured Notes due 2027 [Member]

Debt Instrument [Line Items]

Interest rate

5.75%

5.75%

Debt obligations

$ 1,650,000,000

$ 1,650,000,000

Electric Lightwave [Member] | Term Loan Facility [Member] | New 2025 Notes [Member]

Debt Instrument [Line Items]

Redemption of debt

$ 570,100,000

Electric Lightwave [Member] | Term Loan Facility [Member] | $650 Million Term Loan [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 650,000,000

Electric Lightwave [Member] | Term Loan Facility [Member] | Term Loan 2500 Million [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 2,500,000,000

Repriced percentage

99.75%

Electric Lightwave [Member] | Term Loan Facility [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Facility interest rate

2.25%

Electric Lightwave [Member] | Term Loan Facility [Member] | LIBOR [Member] | $650 Million Term Loan [Member]

Debt Instrument [Line Items]

Facility interest rate

2.50%

Electric Lightwave [Member] | Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member]

Debt Instrument [Line Items]

Facility interest rate

1.00%

Electric Lightwave [Member] | Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member] | $650 Million Term Loan [Member]

Debt Instrument [Line Items]

Facility interest rate

1.00%

Electric Lightwave [Member] | Incremental Term Loan [Member]

Debt Instrument [Line Items]

Interest rate decrease (basis point)

(0.25%)

LONG-TERM DEBT (Debt Issuance C

LONG-TERM DEBT (Debt Issuance Costs - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	May 06, 2015
LONG-TERM DEBT
Debt issuance cost				$ 114.1
Loss on extinguishment of debt		$ (4.9)
Unamortized debt issuance cost	$ 57.1		$ 59.6
Accumulated amortization of debt issuance costs	57		$ 54.5
Interest expense associated with the amortization of debt issuance costs	$ 2.5	$ 2.3

INCOME TAXES (Reconciliation of

INCOME TAXES (Reconciliation of Income Tax Provision) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
INCOME TAXES
Expected expense at the statutory rate	$ 8.9	$ 10
Non-deductible stock-based compensation	1.1	1.5
State income taxes benefit, net of federal benefit	1.5	0.6
Transaction costs not deductible for tax purposes	0.3	0.1
Change in tax rates	(0.1)
Foreign tax rate differential	0.2	(2.2)
U.S. Tax Reform	7.6
Foreign entities with valuation allowance	(0.3)	(5.7)
Other, net	1.3	1.1
Provision for income taxes	$ 20.5	$ 5.4

INCOME TAXES (U.S. Tax Reform)

INCOME TAXES (U.S. Tax Reform) (Details) - Tax Expense [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended	15 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018
Change in statutory rate, U.S. only	$ 6.2	$ (16.3)	$ (10.1)
Changes to indefinite reinvestment assertion		0.8	0.8
Repatriation tax	1.4	37.6	39
Net impacts of U.S. Tax Reform	$ 7.6	$ 22.1	$ 29.7

INCOME TAXES (Narrative) (Detai

INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	Dec. 22, 2017	Sep. 30, 2018	Jun. 30, 2018
INCOME TAXES
Effective tax rates	35.00%	21.00%
Liability for uncertain tax positions related to state taxing jurisdictions		$ 3.1	$ 3
Accrued interest and penalties		0.2	$ 0.1
Provisional amount as a deferred tax liability for additional estimated tax		$ 0.8

EQUITY (Details)

EQUITY (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)$ / sharesshares
EQUITY
Number of shares repurchased | shares	6,229
Average price per share | $ / shares	$ 34
Value for repurchase of shares excluding commissions	$ 0.2
Increase in member's interest associated with stock-based compensation expense	$ 26.3

STOCK-BASED COMPENSATION (Summa

STOCK-BASED COMPENSATION (Summary of Stock-based Compensation Expense Liability and Equity Classified Awards Included in Consolidated Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 26.7	$ 27.8
Operating Costs [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2.7	3.2
Selling, general and administrative expenses
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	24	24.6
Part A Restricted Stock Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	23.3	22.2
Part B Restricted Stock Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2.9	5.1
Part C Restricted Stock Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 0.5	$ 0.5

STOCK-BASED COMPENSATION (Narra

STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ in Millions	Oct. 16, 2014	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
PCIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incentive plan termination period	10 years	10 days
Part A Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award recorded as liability		$ 5.2	$ 5.7
Unrecognized compensation cost		$ 31
Number of RSUs, Granted		763,558
Part B Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized		403,084	539,049	532,804	569,636	590,256
Unrecognized compensation cost		$ 7.7
Number of RSUs, Granted		58,418	78,123	77,218	82,556	163,960
Part C Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Granted		14,137				15,686
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period		1 year
Average closing price		10 days

STOCK-BASED COMPENSATION (Sum_2

STOCK-BASED COMPENSATION (Summary of Restricted Stock Units Activity) (Details) - $ / shares	3 Months Ended					12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2018
Part A Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Outstanding beginning balance	2,246,495
Number of RSUs, Granted	763,558
Number of RSUs, Vested	(686,302)
Number of RSUs, Forfeited	(120,057)
Number of RSUs, Outstanding ending balance	2,203,694	2,246,495				2,246,495
Weighted average grant-date fair value per share, Outstanding beginning balance	$ 35.08
Weighted average grant-date fair value per share, Granted	34.48
Weighted average grant-date fair value per share, Vested	34.70
Weighted average grant-date fair value per share, Outstanding ending balance	$ 34.84	$ 35.08				$ 35.08
Weighted average remaining contractual term in months	6 years 1 month 6 days					6 years 4 months 24 days
Part B Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Outstanding beginning balance	185,775
Number of RSUs, Granted	58,418	78,123	77,218	82,556	163,960
Number of RSUs, Outstanding ending balance	244,193	185,775				185,775
Weighted average grant-date fair value per share, Outstanding beginning balance	$ 57.19
Weighted average grant-date fair value per share, Granted	64.41	$ 74.44	$ 52.47	$ 45.10	$ 19.06
Weighted average grant-date fair value per share, Outstanding ending balance	$ 58.92	$ 57.19				$ 57.19
Weighted average remaining contractual term in months	7 years 4 months 24 days					8 years 10 months 24 days

STOCK-BASED COMPENSATION (Sum_3

STOCK-BASED COMPENSATION (Summary Of Part B RSUs Granted, Maximum Eligible Shares Of Stock And Grant Date Fair Value Per Part B RSU) (Details) - Part B Restricted Stock Units [Member] - $ / shares	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Granted	58,418	78,123	77,218	82,556	163,960
Maximum eligible shares of the Company's common stock	403,084	539,049	532,804	569,636	590,256
Grant date fair value per Part B RSU	$ 64.41	$ 74.44	$ 52.47	$ 45.10	$ 19.06
Units converted to Company's common stock at vesting date					54,671

EMPLOYEE BENEFITS (Net Periodic

EMPLOYEE BENEFITS (Net Periodic Cost Included in SG&A Expenses) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.8
Interest cost	0.9
Expected return on plan assets	(1.4)
Amortization of loss from earlier periods	0.2
Gain on curtailment(1)	(0.4)
Net periodic pension benefit cost	0.1
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1
Net periodic pension benefit cost	$ 0.1

FAIR VALUE MEASUREMENTS (Narrat

FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions	Jan. 19, 2017	Jul. 22, 2016	Jan. 15, 2016	Sep. 30, 2018	Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes				$ 5,696.3	$ 5,695.1
Hypothetical annual interest expense				17.6
LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Basis spread			3.50%
Term Loan Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes				1,750.6	1,751.3
Fair value of the notes				$ 1,769.4	1,772.3
Debt instrument, face amount	$ 1,850
Hypothetical interest rate increase				1.00%
Term Loan Facility [Member] | LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Basis spread		2.75%
Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Basis spread		1.00%
Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes				$ 4,002.8	4,003.4
Fair value of the notes				4,051	3,986.5
Tranche One [Member] | Term Loan Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 500			$ 500
Tranche One [Member] | Term Loan Facility [Member] | LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Basis spread	2.00%			2.00%
Floor rate				0.00%
Tranche One [Member] | Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Basis spread	0.00%
B-2 Term Loan Tranche [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Basis spread				2.25%
B-2 Term Loan Tranche [Member] | LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Floor rate				1.00%
Tranche Two [Member] | Term Loan Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 1,350
Revolver [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes				$ 0	$ 0

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - 3 months ended Sep. 30, 2018 $ in Millions, $ in Millions	CAD ($)	USD ($)
Commitment And Contingencies [Line Items]
Purchase commitments		$ 625.6
Unsecured credit letter agreement limit		8.1
Telecommunications Services Commitment [Member]
Commitment And Contingencies [Line Items]
Other commitment		40
Term of Commitment	3 years
Credit Letter Agreement [Member]
Commitment And Contingencies [Line Items]
Outstanding letters of credit	$ 3.5	2.7
Unsecured credit letter agreement limit	$ 5	$ 3.9

REVENUE AND CONTRACT COSTS (Det

REVENUE AND CONTRACT COSTS (Details) $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)segment	Sep. 30, 2017USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment	6
Fiber Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue from non-lease arrangement	$ 5.2	$ 4.5
zColo [Member]
Disaggregation of Revenue [Line Items]
Revenue from non-lease arrangement	$ 14.5	$ 14.1

REVENUE AND CONTRACT COSTS - Re

REVENUE AND CONTRACT COSTS - Remaining Performance Obligation (Details) $ in Millions	Sep. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 1,390.2
Fiber Solutions [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	10.2
Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	736.3
Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	392.8
zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	68.1
Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	182.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	643.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 | Fiber Solutions [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	8.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 | Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	313.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 | Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	180.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 | zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	25.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 | Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	115.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	440.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 | Fiber Solutions [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	1.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 | Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	236.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 | Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	133.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 | zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	20.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 | Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	49.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	196.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Fiber Solutions [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	0.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	112.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	58.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	10.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	14.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	59.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	36.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	14.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	5.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	2.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	24.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	16.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	2.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 | Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	0.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	25.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01 | Transport [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	20.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01 | Enterprise Networks [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	0.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01 | zColo [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	3.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01 | Allstream
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0.1

REVENUE AND CONTRACT COSTS - Co

REVENUE AND CONTRACT COSTS - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
REVENUE AND CONTRACT COSTS
Customer receivable, net	$ 160		$ 164
Contract liabilities	64		$ 68.9
Contract with customer liability, revenue recognized	$ 5.4	$ 5.6

REVENUE AND CONTRACT COSTS - _2

REVENUE AND CONTRACT COSTS - Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Minimum [Member]
Contract Costs
Amortization period (in months)	12 months
Maximum [Member]
Contract Costs
Amortization period (in months)	57 months
Selling, general and administrative expenses
Contract Costs
Amortization of deferred contract costs	$ 2.1	$ 2.2
Other current assets
Contract Costs
Short-term unamortized contract costs	6.6		$ 7.1
Other assets
Contract Costs
Long term unamortized contract costs	$ 4.9		$ 5.6

RELATED PARTY TRANSACTIONS (Sch

RELATED PARTY TRANSACTIONS (Schedule of Revenue and Expense Transactions) (Details) - Inteliquent, Inc [Member] $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)
Related Party Transaction [Line Items]
Revenues	$ 1.9
Operating costs	$ 0.6

RELATED PARTY TRANSACTIONS (Nar

RELATED PARTY TRANSACTIONS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Dan Caruso [Member]
Related Party Transaction [Line Items]
Payable to related party settled	$ 0.1	$ 0.1

SEGMENT REPORTING (Narrative) (

SEGMENT REPORTING (Narrative) (Details)	3 Months Ended
	Sep. 30, 2018customersegment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	6
Minimum [Member]
Segment Reporting Information [Line Items]
Number of dark fiber pairs leased to customers	2
Maximum [Member]
Segment Reporting Information [Line Items]
Number of dark fiber pairs leased to customers	12
Fiber Solutions [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Contract term	3 years
Fiber Solutions [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Contract term	20 years
Transport [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Contract term	2 years
Transport [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Contract term	5 years
Enterprise Networks [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Contract term	1 year
Enterprise Networks [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Contract term	10 years
zColo [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Contract term	2 years
zColo [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Contract term	5 years
Other [Member]
Segment Reporting Information [Line Items]
Contract term	1 year

SEGMENT REPORTING (Summary of F

SEGMENT REPORTING (Summary of Financial Information by Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue from external customers	$ 641.1	$ 643.1
Segment Adjusted EBITDA	319.4	316.4
Total assets	9,310.3		$ 9,205.3
Capital expenditures	182.5	193.4
Corp/Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA		(0.1)
Total assets	187.3		111.2
Fiber Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	220.9	198.4
Segment Adjusted EBITDA	178.4	159.7
Total assets	4,991		4,937.3
Capital expenditures	99.1	107.3
Enterprise Networks [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	82.6	85.4
Segment Adjusted EBITDA	34	33.4
Total assets	755.9		754.6
Capital expenditures	13.2	10.4
Impact of pricing changes	(0.7)
Transport [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	168.4	168
Segment Adjusted EBITDA	57.1	60.3
Total assets	1,878		1,870.9
Capital expenditures	40.4	44.3
zColo [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	59	58.4
Segment Adjusted EBITDA	28	28.6
Total assets	1,038.4		1,032.4
Capital expenditures	25.2	27.9
Allstream, Inc. [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	105	127.7
Segment Adjusted EBITDA	20.8	33.2
Total assets	427.3		465.5
Capital expenditures	4.6	3.5
Impact of pricing changes	0.7
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	5.2	5.2
Segment Adjusted EBITDA	1.1	$ 1.3
Total assets	$ 32.4		$ 33.4

SEGMENT REPORTING (Reconciliati

SEGMENT REPORTING (Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
SEGMENT REPORTING
Total Segment Adjusted EBITDA	$ 319.4	$ 316.4
Interest expense	(82.2)	(73.6)
Depreciation and amortization	(167.8)	(183.8)
Transaction costs	(0.7)	(8.3)
Stock-based compensation	(26.7)	(27.8)
Loss on extinguishment of debt		(4.9)
Foreign currency loss on intercompany loans	(4.6)	10.8
Gain on business disposition	5.5
Non-cash loss on investments	(0.3)	(0.1)
Income from operations before income taxes	$ 42.6	$ 28.7

CONDENSED CONSOLIDATING FINAN_3

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Condensed Financial Statements Captions [Line Items]
Debt obligations	$ 5,741.8	$ 5,743.1
6.00% Senior Notes due 2023 [Member] | Unsecured Debt [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	1,430	1,430
6.375% Senior Notes due 2025 [Member] | Unsecured Debt [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	900	900
5.75% Senior Unsecured Notes due 2027 [Member] | Unsecured Debt [Member]
Condensed Financial Statements Captions [Line Items]
Debt obligations	$ 1,650	$ 1,650

CONDENSED CONSOLIDATING FINAN_4

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Schedule Of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017
Current assets
Cash and cash equivalents	$ 353.2	$ 256	$ 290.5	$ 220
Trade receivables, net of allowance	227.2	235.6
Prepaid expenses	68.2	74.1
Other current assets	27.7	25.8
Assets held for sale		41.8
Total current assets	676.3	633.3
Property and equipment, net	5,524.7	5,427.6
Intangible assets, net	1,192.5	1,212.1
Goodwill	1,710.2	1,719.1
Deferred income taxes, net	36.2	37.6
Other assets	170.4	175.6
Total assets	9,310.3	9,205.3
Current liabilities
Accounts payable	41.9	45.9
Accrued liabilities	314.2	315.1
Accrued interest	85.4	72.6
Current portion of long-term debt	5	5
Capital lease obligations, current	10.5	11.9
Deferred revenue, current	171.6	162.9
Liabilities associated with assets held for sale		6.1
Total current liabilities	628.6	619.5
Long-term debt, non-current	5,691.3	5,690.1
Capital lease obligation, non-current	142.9	121.6
Deferred revenue, non-current	1,085.6	1,076.3
Deferred income taxes, net	167.5	152.4
Other long-term liabilities	52.3	57.8
Total liabilities	7,768.2	7,717.7
Member's equity
Member's interest	1,902.7	1,876.6
Accumulated other comprehensive loss	(9.2)	(15.5)
Accumulated deficit	(351.4)	(373.5)
Total member's equity	1,542.1	1,487.6
Total liabilities and member's equity	9,310.3	9,205.3
Eliminations [Member]
Current assets
Related party receivable	(365.9)	(362.7)
Investment in subsidiary	(684.9)	(661)
Total assets	(1,050.8)	(1,023.7)
Current liabilities
Related party debt, long-term	(365.9)	(362.7)
Total liabilities	(365.9)	(362.7)
Member's equity
Member's interest	(571)	(563.2)
Accumulated other comprehensive loss	9.2	15.5
Accumulated deficit	(123.1)	(113.3)
Total member's equity	(684.9)	(661)
Total liabilities and member's equity	(1,050.8)	(1,023.7)
Zayo Group, LLC [Member]
Current assets
Cash and cash equivalents	224.2	138.1
Trade receivables, net of allowance	134.4	134.9
Prepaid expenses	49.3	52
Other current assets	65.4	56.5
Assets held for sale		41.8
Total current assets	473.3	423.3
Property and equipment, net	4,779.7	4,698.9
Intangible assets, net	1,046.6	1,064.6
Goodwill	1,520.3	1,526.6
Other assets	134.9	141.1
Related party receivable	365.9	362.7
Investment in subsidiary	684.9	661
Total assets	9,005.6	8,878.2
Current liabilities
Accounts payable	24.5	24.5
Accrued liabilities	235.4	237.8
Accrued interest	85.4	72.6
Current portion of long-term debt	5	5
Capital lease obligations, current	9	10.6
Deferred revenue, current	136.9	126.3
Liabilities associated with assets held for sale		6.1
Total current liabilities	496.2	482.9
Long-term debt, non-current	5,691.3	5,690.1
Capital lease obligation, non-current	133.3	111.4
Deferred revenue, non-current	987.8	963.8
Deferred income taxes, net	134.4	120
Other long-term liabilities	20.5	22.4
Total liabilities	7,463.5	7,390.6
Member's equity
Member's interest	1,911.8	1,885.7
Accumulated other comprehensive loss	(9.2)	(15.5)
Accumulated deficit	(360.5)	(382.6)
Total member's equity	1,542.1	1,487.6
Total liabilities and member's equity	9,005.6	8,878.2
Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	7.4	5.9
Trade receivables, net of allowance	0.8	2.7
Prepaid expenses	0.1	0.2
Total current assets	8.3	8.8
Intangible assets, net	8.7	9.2
Goodwill	14.6	14.6
Total assets	31.6	32.6
Current liabilities
Accounts payable	0.1	0.1
Accrued liabilities	0.9	0.7
Deferred revenue, current	0.1	0.2
Total current liabilities	1.1	1
Total liabilities	1.1	1
Member's equity
Member's interest	15.1	16.8
Accumulated deficit	15.4	14.8
Total member's equity	30.5	31.6
Total liabilities and member's equity	31.6	32.6
Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	121.6	112
Trade receivables, net of allowance	92	98
Prepaid expenses	18.8	21.9
Other current assets	(37.7)	(30.7)
Total current assets	194.7	201.2
Property and equipment, net	745	728.7
Intangible assets, net	137.2	138.3
Goodwill	175.3	177.9
Deferred income taxes, net	36.2	37.6
Other assets	35.5	34.5
Total assets	1,323.9	1,318.2
Current liabilities
Accounts payable	17.3	21.3
Accrued liabilities	77.9	76.6
Capital lease obligations, current	1.5	1.3
Deferred revenue, current	34.6	36.4
Total current liabilities	131.3	135.6
Related party debt, long-term	365.9	362.7
Capital lease obligation, non-current	9.6	10.2
Deferred revenue, non-current	97.8	112.5
Deferred income taxes, net	33.1	32.4
Other long-term liabilities	31.8	35.4
Total liabilities	669.5	688.8
Member's equity
Member's interest	546.8	537.3
Accumulated other comprehensive loss	(9.2)	(15.5)
Accumulated deficit	116.8	107.6
Total member's equity	654.4	629.4
Total liabilities and member's equity	$ 1,323.9	$ 1,318.2

CONDENSED CONSOLIDATING FINAN_5

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Schedule Of Condensed Consolidating Statements Of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 641.1	$ 643.1
Operating costs and expenses
Operating costs (excluding depreciation amortization and including stock-based compensation)	228.4	235.7
Selling, general and administrative expenses (including stock-based compensation)	122.1	128.1
Depreciation and amortization	167.8	183.8
Total operating costs and expenses	518.3	547.6
Operating income	122.8	95.5
Other expenses
Interest expense	(82.2)	(73.6)
Loss on extinguishment of debt		4.9
Foreign currency loss on intercompany loans	(4.6)	10.8
Other income/(expense), net	6.6	0.9
Total other expenses, net	(80.2)	(66.8)
Income from operations before income taxes	42.6	28.7
Provision/(benefit) for income taxes	20.5	5.4
Net income	22.1	23.3
Other comprehensive income/(loss), net of income taxes	6.3	22.1
Comprehensive income	28.4	45.4
Eliminations [Member]
Other expenses
Equity in net earnings of subsidiaries	(9.8)	(17)
Total other expenses, net	(9.8)	(17)
Income from operations before income taxes	(9.8)	(17)
Net income	(9.8)	(17)
Other comprehensive income/(loss), net of income taxes	(6.3)	(22.1)
Comprehensive income	(16.1)	(39.1)
Zayo Group, LLC [Member]
Revenue	498.6	487.8
Operating costs and expenses
Operating costs (excluding depreciation amortization and including stock-based compensation)	160.7	161.1
Selling, general and administrative expenses (including stock-based compensation)	91.3	92.8
Depreciation and amortization	146	154.6
Total operating costs and expenses	398	408.5
Operating income	100.6	79.3
Other expenses
Interest expense	(76.5)	(68)
Loss on extinguishment of debt		4.9
Foreign currency loss on intercompany loans	(2.2)	5.3
Other income/(expense), net	6.2	0.2
Equity in net earnings of subsidiaries	9.8	17
Total other expenses, net	(62.7)	(50.4)
Income from operations before income taxes	37.9	28.9
Provision/(benefit) for income taxes	15.8	5.6
Net income	22.1	23.3
Other comprehensive income/(loss), net of income taxes	6.3	22.1
Comprehensive income	28.4	45.4
Guarantor Subsidiaries [Member]
Revenue	5.2	5.1
Operating costs and expenses
Operating costs (excluding depreciation amortization and including stock-based compensation)	3.7	3.8
Selling, general and administrative expenses (including stock-based compensation)	0.4	0.3
Depreciation and amortization	0.5	0.5
Total operating costs and expenses	4.6	4.6
Operating income	0.6	0.5
Other expenses
Income from operations before income taxes	0.6	0.5
Net income	0.6	0.5
Comprehensive income	0.6	0.5
Non-Guarantor Subsidiaries [Member]
Revenue	137.3	150.2
Operating costs and expenses
Operating costs (excluding depreciation amortization and including stock-based compensation)	64	70.8
Selling, general and administrative expenses (including stock-based compensation)	30.4	35
Depreciation and amortization	21.3	28.7
Total operating costs and expenses	115.7	134.5
Operating income	21.6	15.7
Other expenses
Interest expense	(5.7)	(5.6)
Foreign currency loss on intercompany loans	(2.4)	5.5
Other income/(expense), net	0.4	0.7
Total other expenses, net	(7.7)	0.6
Income from operations before income taxes	13.9	16.3
Provision/(benefit) for income taxes	4.7	(0.2)
Net income	9.2	16.5
Other comprehensive income/(loss), net of income taxes	6.3	22.1
Comprehensive income	$ 15.5	$ 38.6

CONDENSED CONSOLIDATING FINAN_6

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Millions	Feb. 26, 2018	Jul. 05, 2017	Sep. 30, 2018	Sep. 30, 2017
Net cash provided by operating activities			$ 241.8	$ 268.8
Cash flows from investing activities:
Purchases of property and equipment			(182.5)	(193.4)
Proceeds from sale of SRT, net of cash held in escrow			39
Net cash used in investing activities			(143.5)	(193.4)
Cash flows from financing activities:
Proceeds from debt	$ 150	$ 310.7		312.8
Principal payments on long-term debt			(1.3)	(311.9)
Principal repayments on capital lease obligations			(1.9)	(1.7)
Payment of debt issuance costs				(3.4)
Payments to repurchase ZGH common stock			(0.2)
Cash paid for Santa Clara acquisition financing arrangement and other			(3.3)	(1.3)
Net cash used in financing activities			(6.7)	(5.5)
Effect of changes in foreign exchange rates on cash			2.2	0.6
Net increase/(decrease) in cash and cash equivalents			93.8	70.5
Cash, cash equivalents and restricted cash, beginning of year			260.6	224.5
Cash, cash equivalents and restricted cash, end of period			354.4	295
Zayo Group, LLC [Member]
Net cash provided by operating activities			212	213.6
Cash flows from investing activities:
Purchases of property and equipment			(150.5)	(176.3)
Proceeds from sale of SRT, net of cash held in escrow			39
Net cash used in investing activities			(111.5)	(176.3)
Cash flows from financing activities:
Proceeds from debt				312.8
Principal payments on long-term debt			(1.3)	(311.9)
Principal repayments on capital lease obligations			(1.6)	(1.6)
Payment of debt issuance costs				(3.4)
Contributions to parent			(8.7)	1.1
Payments to repurchase ZGH common stock			(0.2)
Cash paid for Santa Clara acquisition financing arrangement and other			(3.3)	(1.3)
Net cash used in financing activities			(15.1)	(4.3)
Net increase/(decrease) in cash and cash equivalents			85.4	33
Cash, cash equivalents and restricted cash, beginning of year			142.7	101.1
Cash, cash equivalents and restricted cash, end of period			228.1	134.1
Guarantor Subsidiaries [Member]
Net cash provided by operating activities			3.1	3.6
Cash flows from financing activities:
Contributions to parent			(1.6)	(1.1)
Net cash used in financing activities			(1.6)	(1.1)
Net increase/(decrease) in cash and cash equivalents			1.5	2.5
Cash, cash equivalents and restricted cash, beginning of year			5.9	2.1
Cash, cash equivalents and restricted cash, end of period			7.4	4.6
Non-Guarantor Subsidiaries [Member]
Net cash provided by operating activities			26.7	51.6
Cash flows from investing activities:
Purchases of property and equipment			(32)	(17.1)
Net cash used in investing activities			(32)	(17.1)
Cash flows from financing activities:
Principal repayments on capital lease obligations			(0.3)	(0.1)
Contributions to parent			10.3
Net cash used in financing activities			10	(0.1)
Effect of changes in foreign exchange rates on cash			2.2	0.6
Net increase/(decrease) in cash and cash equivalents			6.9	35
Cash, cash equivalents and restricted cash, beginning of year			112	121.3
Cash, cash equivalents and restricted cash, end of period			$ 118.9	$ 156.3

SUBSEQUENT EVENTS (Narrative) (

SUBSEQUENT EVENTS (Narrative) (Details) $ / shares in Units, $ in Millions	Nov. 07, 2018company	Nov. 06, 2018USD ($)$ / sharesshares	Nov. 30, 2018USD ($)	Sep. 30, 2018USD ($)$ / sharesshares
Subsequent Events
Number of shares repurchased | shares				6,229
Average price per share | $ / shares				$ 34
Value of shares repurchased				$ 0.2
Subsequent Event
Subsequent Events
Number of shares repurchased | shares		12,966,527
Average price per share | $ / shares		$ 31.02
Value of shares repurchased		$ 402.3
Value remaining outstanding under share repurchase authorization		4
Share repurchase program amount		$ 500
Aggregate amount of borrowings			$ 200
Available borrowing capacity			$ 241.9
Plans to separate ZGH into number of companies | company	2

Uncategorized Items - zgl-20180

Label	Element	Value
Restricted Cash	us-gaap_RestrictedCash	$ 4,500,000
Restricted Cash	us-gaap_RestrictedCash	4,500,000
Restricted Cash	us-gaap_RestrictedCash	4,600,000
Restricted Cash	us-gaap_RestrictedCash	$ 1,200,000