Zayo 10-Q 10 Nov 15 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Sep. 30, 2015	Nov. 06, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Entity Registrant Name	Zayo Group Holdings, Inc.
Entity Central Index Key	1,608,249
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		244,866,876

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Current assets
Cash and cash equivalents	$ 345.7	$ 308.6
Trade receivables, net of allowance of $4.2 and $3.4 as of September 30, 2015 and June 30, 2015, respectively	90.3	88
Due from related parties	0.3	0.6
Prepaid expenses	34.9	37.3
Deferred income taxes, net	129.5	129.5
Other assets	8.4	3.9
Total current assets	609.1	567.9
Property and equipment, net	3,349	3,299.2
Intangible assets, net	925.3	948.3
Goodwill	1,218.8	1,224.4
Other assets	63.7	54.8
Total assets	6,165.9	6,094.6
Current liabilities
Current portion of long-term debt	16.5	16.5
Accounts payable	36.4	40
Accrued liabilities	180.2	182.2
Accrued interest	76.3	57.2
Capital lease obligations, current	4.4	4.4
Deferred revenue, current	90.4	86.6
Total current liabilities	404.2	386.9
Long-term debt, non-current	3,651.1	3,652.2
Capital lease obligation, non-current	32.1	28.3
Deferred revenue, non-current	637.2	612.7
Stock-based compensation liability	2.4	1.9
Deferred income taxes, net	168.4	174.7
Other long-term liabilities	27	26.7
Total liabilities	$ 4,922.4	$ 4,883.4
Commitments and contingencies (Note 10)
Stockholders' equity
Preferred stock, $0.001 par value-- 50,000,000 shares authorized; no shares issued and outstanding as of September 30, 2015 and June 30, 2015, respectively
Common stock, $0.001 par value--850,000,000 shares authorized; 245,236,924 and 243,008,679 shares issued and outstanding as of September 30, 2015 and June 30, 2015, respectively	$ 0.2	$ 0.2
Additional paid-in capital	1,757.3	1,705.8
Accumulated other comprehensive loss	(11.9)	(7.9)
Accumulated deficit	(502.1)	(486.9)
Total stockholders' equity	1,243.5	1,211.2
Total liabilities and stockholders' equity	$ 6,165.9	$ 6,094.6

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Statement Of Financial Position [Abstract]
Trade receivables allowance	$ 4.2	$ 3.4
Preferred Stock, Par value	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	50,000,000	50,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	850,000,000	850,000,000
Common stock, shares issued	245,236,924	243,008,679
Common stock, shares outstanding	245,236,924	243,008,679

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 366.8	$ 320.6
Operating costs and expenses
Operating costs (excluding depreciation and amortization and including stock-based compensation—Note 8)	113	107.3
Selling, general and administrative expenses (including stock-based compensation—Note 8)	84.6	156.8
Depreciation and amortization	117.1	96
Total operating costs and expenses	314.7	360.1
Operating income/(loss)	52.1	(39.5)
Other expenses
Interest expense	(53.8)	(46.9)
Foreign currency loss on intercompany loans	(10.7)	(14.7)
Other expense, net	(0.1)
Total other expenses, net	(64.6)	(61.6)
Loss from operations before income taxes	(12.5)	(101.1)
Provision for income taxes	2.7	9.4
Net loss	$ (15.2)	$ (110.5)
Weighted-average shares used to compute net loss per share:
Basic and Diluted	243	223
Net loss per share:
Basic and Diluted	$ (0.06)	$ (0.50)

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Comprehensive Income Net Of Tax [Abstract]
Net loss	$ (15.2)	$ (110.5)
Foreign currency translation adjustments	(4)	(12.3)
Comprehensive loss	$ (19.2)	$ (122.8)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - 3 months ended Sep. 30, 2015 - USD ($) $ in Millions	Total	Common Stock [Member]	Additional paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Balance at Jun. 30, 2015	$ 1,211.2	$ 0.2	$ 1,705.8	$ (7.9)	$ (486.9)
Balance (in shares) at Jun. 30, 2015	243,008,679	243,008,679
Stock-based compensation	$ 43.6		43.6
Stock-based compensation, shares		2,228,245
Tax benefits from stock-based compensation	7.9		7.9
Foreign currency translation adjustments	(4)			(4)
Net loss	(15.2)				(15.2)
Balance at Sep. 30, 2015	$ 1,243.5	$ 0.2	$ 1,757.3	$ (11.9)	$ (502.1)
Balance (in shares) at Sep. 30, 2015	245,236,924	245,236,924

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS € in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)
Cash flows from operating activities
Net loss	$ (15.2)	$ (110.5)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	117.1	96
Non-cash interest expense	3.5	2.7
Stock-based compensation	46.1	123.1
Amortization of deferred revenue	(20.4)	(17.3)
Additions to deferred revenue	49.7	43.2
Foreign currency loss on intercompany loans	10.7	14.7
Excess tax benefit from stock-based compensation	(7.9)
Deferred income taxes	2	6.2
Provision for bad debts	0.6	0.6
Non-cash loss on investments	0.2
Changes in operating assets and liabilities, net of acquisitions
Trade receivables	(5.6)	4
Prepaid expenses	2.2	(2.1)
Payables to/(from) related parties, net	0.1
Accounts payable and accrued liabilities	24.5	(46.8)
Other assets and liabilities	(12.4)	4.4
Net cash provided by operating activities	195.2	118.2
Cash flows from investing activities
Purchases of property and equipment	(159.2)	(115.3)
Other	(0.3)	(0.1)
Net cash used in investing activities	(159.5)	(241.8)
Cash flows from financing activities
Principal payments on long-term debt	(4.1)	(5.1)
Principal payments on capital lease obligations	(1.2)	(0.7)
Excess tax benefit from stock-based compensation	7.9
Net cash provided by/(used in) financing activities	2.6	(5.8)
Net cash flows	38.3	(129.4)
Effect of changes in foreign exchange rates on cash	(1.2)	(0.7)
Net increase/(decrease) in cash and cash equivalents	37.1	(130.1)
Cash and cash equivalents, beginning of year	308.6	297.4
Cash and cash equivalents, end of period	345.7	167.3
Supplemental disclosure of non-cash investing and financing activities:
Cash paid for interest, net of capitalized interest	29.3	73.6
Cash paid for income taxes	4.7	8.7
Non-cash purchases of equipment through capital leasing	5.3	1.6
Increase in accounts payable and accrued expenses for purchases of property and equipment	$ 11	6
Neo Telecoms [Member]
Cash flows from investing activities
Acquisition, net of cash acquired		(73.9)
Colo Facilities Atlanta [Member]
Cash flows from investing activities
Acquisition, net of cash acquired		$ (52.5)

Business and Basis of Presentat

Business and Basis of Presentation	3 Months Ended
	Sep. 30, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business and Basis of Presentation	(1) BUSINESS AND BASIS OF PRESENTATION Business Zayo Group Holdings, Inc., a Delaware corporation, was formed on November 13, 2007, and is the parent company of a number of subsidiaries engaged in bandwidth infrastructure services. Zayo Group Holdings, Inc. and its subsidiaries are collectively referred to as “Zayo Group Holdings” or the “Company.” The Company’s primary operating subsidiary is Zayo Group, LLC (“ZGL”). Headquartered in Boulder, Colorado, the Company operates bandwidth infrastructure assets, including fiber networks and datacenters, in the United States and Europe to offer: · Physical infrastructure, including dark fiber, mobile infrastructure and colocation services. · Cloud and Connectivity services, previously referred to as Lit Services, including wavelengths, Ethernet, IP, SONET, and Cloud services. · Other services, including Zayo Professional Services. The Company’s shares are listed on the New York Stock Exchange (NYSE) under the ticker symbol “ZAYO”. 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, 2015 included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2015. In the opinion of management, all adjustments considered necessary for a 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 month period ended September 30, 2015 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 ended June 30, 2015 as “Fiscal 2015” and the fiscal year ending June 30, 2016 as “Fiscal 2016.” Earnings or Loss per Share Basic earnings or loss per share attributable to the Company’s common shareholders is computed by dividing net earnings or loss attributable to common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings or loss per share attributable to common shareholders presents the dilutive effect, if any, on a per share basis of potential common shares (such as restricted stock units) as if they had been vested or converted during the periods presented. No such items were included in the computation of diluted loss per share for the three months ended September 30, 2015 and 2014 as the Company incurred a loss from continuing operations in those periods and the effect of inclusion would have been anti-dilutive. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies described in its Annual Report on Form 10-K for the year ended June 30, 2015. 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. Significant 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 and estimating the common unit and 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 In September 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2015-16, Simplifying the Accounting for Measurement-Period Adjustments, which requires acquirers who have reported provisional amounts for items in a business combination to recognize adjustments to provisional amounts that are identified during the measurement period, in the reporting period in which the adjustments are determined. The ASU also requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. Prior to the issuance of ASU 2015-16, adjustments to provisional amounts were required to be retrospectively adjusted. The Company prospectively early-adopted ASU 2015-16 effective July 1, 2015. The adoption of this standard did not have a material impact on the financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers

Acquisitions

Acquisitions	3 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisitions	(2) ACQUISITIONS Since its formation, the Company has consummated 34 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 2015 Colo Facilities Atlanta (“AtlantaNAP”) On July 1, 2014, the Company acquired 100% of the equity interest in AtlantaNAP, a datacenter and managed services provider in Atlanta, for cash consideration of $51.9 million. The acquisition was considered an asset purchase for tax purposes. Neo Telecoms (“Neo”) On July 1, 2014, the Company acquired a 96% equity interest in Neo, a Paris-based bandwidth infrastructure company. The purchase agreement also includes a call option to acquire the remaining equity interest on or after December 31, 2015. The purchase consideration of €54.1 million (or $73.9 million), net of cash acquired, was in consideration of acquiring 96% equity ownership in Neo and a call option to purchase the remaining 4% equity interest in Neo. The fair value of the 4% non-controlling interest in Neo as of the acquisition date was $2.9 million and recorded in Other long-term liabilities. The consideration consisted of cash and was paid with cash on hand from the proceeds of the Term Loan Facility (as defined below). €8.7 million (or $11.9 million) of the purchase consideration is currently held in escrow pending the expiration of the indemnification adjustment period. The acquisition was considered a stock purchase for tax purposes. IdeaTek Systems, Inc. (“IdeaTek”) Effective January 1, 2015, the Company acquired all of the equity interest in IdeaTek. The purchase price, subject to certain post-closing adjustments, was $52.7 million and was paid with cash on hand. $3.2 million of the purchase consideration is currently held in escrow pending the expiration of the indemnification adjustment period. The acquisition was considered a stock purchase for tax purposes. The IdeaTek acquisition added 1,800 route miles to the Company’s network in Kansas, and includes a dense metro footprint in Wichita, Kansas. The network spans across Kansas and connects to approximately 600 cellular towers and over 100 additional buildings. Latisys Holdings, LLC (“Latisys”) On February 23, 2015, the Company acquired the operating units of Latisys, a colocation and infrastructure as a service (“Iaas”) provider for a price of $677.8 million, net of cash acquired. The Latisys acquisition was funded with the proceeds of the January Notes Offering (as defined in Note 5 – Long-Term Debt 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, 2015, 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, deferred revenue and resulting deferred taxes related to its acquisitions of Latisys and Ideatek. 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 analysis. The table below reflects the Company's estimates of the acquisition date fair values of the assets and liabilities assumed from its Fiscal 2015 acquisitions: AtlantaNAP Neo IdeaTek Latisys Acquisition date July 1, 2014 July 1, 2014 January 1, 2015 February 23, 2015 Cash $ — $ 4.2 $ — $ 9.4 Other current assets 0.2 9.5 0.8 17.2 Property and equipment 7.0 31.3 32.3 222.9 Deferred tax assets, net — — 2.9 0.7 Intangibles 21.0 26.4 7.6 250.2 Goodwill 25.2 32.5 38.8 279.3 Other assets — 2.3 — 5.0 Total assets acquired 53.4 106.2 82.4 784.7 Current liabilities 1.5 13.5 4.5 10.0 Deferred revenue — 3.7 25.2 3.2 Deferred tax liability, net — 7.6 — 84.3 Other liabilities — 3.3 — — Total liabilities assumed 1.5 28.1 29.7 97.5 Net assets acquired 51.9 78.1 52.7 687.2 Less cash acquired — (4.2 ) — (9.4 ) Net consideration paid $ 51.9 $ 73.9 $ 52.7 $ 677.8 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. Note 3 - Goodwill 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 (including spin-offs), travel expense, severance expense incurred on the date of acquisition or disposal, and other direct expenses incurred that are associated with such acquisitions or disposals. The Company incurred transaction costs of nil and $3.4 million during the three months ended September 30, 2015 and 2014, 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.

Goodwill

Goodwill	3 Months Ended
	Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	(3) GOODWILL The Company’s goodwill balance was $1,218.8 million and $1,224.4 million as of September 30, 2015 and June 30, 2015, respectively. The Company’s reporting units are comprised of its strategic product groups (“SPGs”): Zayo Dark Fiber (“Dark Fiber”), Zayo Wavelength Services (“Waves”), Zayo SONET Services (“SONET”), Zayo Ethernet Services (“Ethernet”), Zayo IP Services (“IP”), Zayo Mobile Infrastructure Group (“MIG”), Zayo Colocation (“zColo"), Zayo Cloud Services (“Cloud”) and Other (primarily Zayo Professional Services (“ZPS”)). The following reflects the changes in the carrying amount of goodwill during the three months ended September 30, 2015: Product Group As of June 30, 2015 Adjustments to Fiscal 2015 Acquisitions Foreign Currency Translation and Other As of September 30, 2015 Dark Fiber $ 299.1 $ — $ (3.2 ) $ 295.9 Waves 265.6 — (1.9 ) 263.7 Sonet 50.3 — — 50.3 Ethernet 104.2 — — 104.2 IP 86.3 — — 86.3 MIG 73.4 — — 73.4 zColo 273.2 (0.5 ) — 272.7 Cloud 57.0 — — 57.0 Other 15.3 — — 15.3 Total $ 1,224.4 $ (0.5 ) $ (5.1 ) $ 1,218.8 During the three months ended September 30, 2015, the Company recorded adjustments to its provisional accounting estimates associated with working capital account balances acquired from the Latisys acquisition, which resulted in a $0.5 million reduction to goodwill.

Intangible Assets

Intangible Assets	3 Months Ended
	Sep. 30, 2015
Intangible Assets Net Excluding Goodwill [Abstract]
Intangible Assets	(4) INTANGIBLE ASSETS Identifiable acquisition-related intangible assets as of September 30, 2015 and June 30, 2015 were as follows: Gross Carrying Amount Accumulated Amortization Net September 30, 2015 Finite-Lived Intangible Assets Customer relationships $ 1,077.9 $ (174.9 ) $ 903.0 Trade names 0.2 (0.1 ) 0.1 Underlying rights 1.7 (0.3 ) 1.4 Total 1,079.8 (175.3 ) 904.5 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying Rights 17.3 — 17.3 Total $ 1,100.6 $ (175.3 ) $ 925.3 June 30, 2015 Finite-Lived Intangible Assets Customer relationships $ 1,080.3 $ (155.0 ) $ 925.3 Trade names 0.2 (0.1 ) 0.1 Underlying rights 1.7 (0.2 ) 1.5 Total 1,082.2 (155.3 ) 926.9 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying Rights 17.9 — 17.9 Total $ 1,103.6 $ (155.3 ) $ 948.3

Long-Term Debt

Long-Term Debt	3 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Long-Term Debt	(5) LONG-TERM DEBT As of September 30, 2015 and June 30, 2015, long-term debt was as follows: September 30, 2015 June 30, 2015 Term Loan Facility due 2021 $ 1,642.6 $ 1,646.8 10.125% Senior Unsecured Notes due 2020 325.6 325.6 6.00% Senior Unsecured Notes Due 2023 1,430.0 1,430.0 6.375% Senior Unsecured Notes Due 2025 350.0 350.0 Total debt obligations 3,748.2 3,752.4 Unamortized discount on Term Loan Facility (19.0 ) (19.8 ) Unamortized premium on 6.00% Senior Unsecured Notes 6.9 7.1 Unamortized debt issuance costs (68.5 ) (71.0 ) Carrying value of debt 3,667.6 3,668.7 Less current portion (16.5 ) (16.5 ) Long-term debt, less current portion $ 3,651.1 $ 3,652.2 Term Loan Facility due 2021 and Revolving Credit Facility On May 6, 2015, ZGL entered into an Amendment and Restatement Agreement whereby the Company’s Credit Agreement (the “Credit Agreement”) governing its senior secured term loan facility (the “Term Loan Facility”) and $450 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 the Company’s outstanding term loans under the Term Loan Facility to May 6, 2021. The interest rate margins applicable to the Term Loan Facility were decreased by 25 basis points to LIBOR plus 2.75% with a minimum LIBOR of 1.0%. In addition, the amended and restated Credit Agreement removed the fixed charge coverage ratio covenant and replaced such covenant with a springing senior secured leverage ratio maintenance requirement applicable only to the Revolver, increased certain lien and debt baskets, and removed certain covenants related to collateral. The terms of the Term Loan Facility require the Company to make quarterly principal payments of $4.1 million plus an annual payment of up to 50% of excess cash flow, as determined in accordance with the Credit Agreement (no such payment was required during the three months ended September 30, 2015 or 2014). The Revolver matures at the earliest of (i) April 17, 2020, (ii) six months prior to the maturity date of the Company’s Term Loan Facility, subject to amendment thereof, and (iii) six months prior to the maturity date of the Company’s 2020 Unsecured Notes (as defined below), subject to repayment or amendment thereof. 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 the Company’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 accrue interest at a rate ranging from LIBOR plus 2.0% to LIBOR plus 3.0% per annum based upon the Company’s leverage ratio. Interest rates on the Term Loan Facility as of September 30, 2015 and June 30, 2015 were 3.75%. Interest rates on the Revolver as of September 30, 2015 and June 30, 2015 were approximately 3.0%. As of September 30, 2015, no amounts were outstanding under the Revolver. Standby letters of credit were outstanding in the amount of $9.2 million as of September 30, 2015, leaving $440.8 million available under the Revolver. 10.125% Senior Unsecured Notes due 2020 On July 2, 2012, ZGL and Zayo Capital, Inc. (the “Issuers”) issued $500.0 million aggregate principal amount of 10.125% senior unsecured notes due 2020 (the “2020 Unsecured Notes”). On December 15, 2014, the Issuers redeemed $174.4 million of their outstanding 2020 Unsecured Notes at a price of 110.125% and $75.0 million of their outstanding 8.125% Senior Secured Notes at a price of 108.125% (the “Note Redemption”). As part of the Note Redemption, the Company recorded an early redemption call premium of $23.8 million which was recorded as a loss on extinguishment of debt on the consolidated statements of operations during three months ended December 31, 2014. 6.00% Senior Unsecured Notes Due 2023 and 6.375% Senior Unsecured Notes due 2025 On January 23, 2015, the Issuers completed a private offering (the “January Notes Offering”) of $700.0 million aggregate principal amount of 6.00% senior unsecured notes due in 2023 (the “2023 Unsecured Notes”). On March 9, 2015, the Issuers completed a private offering of an additional $730.0 million aggregate principal amount of 2023 Unsecured Notes at a premium of 1% (the “March Notes Offering”) resulting in aggregate gross proceeds for the 2023 Unsecured Notes of $1,437.3 million. The issue premium of $7.3 million on the March Notes Offering is being accreted against interest expense over the term of the notes under the effective interest method. The 2023 Unsecured Notes bear interest at the rate of 6.00% per year, which is payable on April 1 and October 1 of each year, beginning on October 1, 2015. The 2023 Unsecured Notes will mature on April 1, 2023. The net proceeds from the January Notes Offering were used to fund the Latisys acquisition (see Note 2 – Acquisitions On May 6, 2015, the Issuers completed a private offering of $350.0 million aggregate principal amount of 6.375% senior unsecured notes due in 2025 (the “2025 Unsecured Notes”). Interest on the 2025 Unsecured Notes is payable on May 15 and November 15 of each year, beginning on November 15, 2015. The 2025 Unsecured Notes will mature on May 15, 2025. The net proceeds from the 2025 Unsecured Notes were used to repay $344.5 million of the Company’s Term Loan Facility. As a result of the repayment, the Company recorded a loss on extinguishment of debt of $8.4 million during the three months ended June 30, 2015. Debt covenants The indentures (the “Indentures”) governing the 2020 Unsecured Notes, the 2023 Unsecured Notes and the 2025 Unsecured Notes (collectively the “Notes”) contain covenants that, among other things, restrict the ability of ZGL 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 ZGL’s restricted subsidiaries to pay dividends or make other payments to ZGL, 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 ZGL maintain a senior secured leverage ratio below 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 indenture governing the 2020 Unsecured Notes limits any increase in ZGL’s secured indebtedness (other than certain forms of secured indebtedness expressly permitted under such indenture) to a pro forma secured debt ratio of 4.50 times the Company’s previous quarter’s annualized modified EBITDA, as defined in the indenture, and limits ZGL’s incurrence of additional indebtedness to a total indebtedness ratio of 5.25 times the previous quarter’s annualized modified EBITDA. The indentures governing the 2023 Unsecured Notes and the 2025 Unsecured Notes limit any increase in ZGL’s secured indebtedness (other than certain forms of secured indebtedness expressly permitted under such indentures) to a pro forma secured debt ratio of 4.50 times ZGL’s previous quarter’s annualized modified EBITDA (as defined in such indentures), and limit ZGL’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, 2015. Guarantees The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by all of ZGL’s current and future domestic restricted subsidiaries. The Notes were co-issued with Zayo Capital, which does not have independent assets or operations. 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 $99.3 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. Unamortized debt issuance costs of $23.2 million associated with the Company’s previous indebtedness were recorded as part of the loss on extinguishment of debt during Fiscal 2015. The balance of debt issuance costs as of September 30, 2015 and June 30, 2015 was $68.5 million and $71.0 million, net of accumulated amortization of $30.8 million and $28.3 million, respectively. The amortization of debt issuance costs is included on the condensed consolidated statements of cash flows within the caption “Non-cash interest expense” along with the amortization or accretion of the premium and discount on the Company’s indebtedness and changes in the fair value of the Company’s interest rate derivatives. Interest expense associated with the amortization of debt issuance costs was $2.5 million and $3.8 million for the three months ended September 30, 2015 and 2014, respectively. Debt issuance costs are presented in the condensed consolidated balance sheets as a reduction to “Long-term debt, non-current”. Interest rate derivatives On August 13, 2012, the Company entered into forward-starting interest rate swap agreements with an aggregate notional value of $750.0 million, a maturity date of June 30, 2017, and a start date of June 30, 2013. There were no up-front fees for these agreements. The contract states that the Company shall pay a 1.67% fixed rate of interest for the term of the agreement beginning on the start date. The counter-party will pay to the Company the greater of actual LIBOR or 1.25%. The Company entered into the forward-starting swap arrangements to reduce the risk of increased interest costs associated with potential changes in LIBOR rates. Changes in the fair value of interest rate swaps are recorded in interest expense in the condensed consolidated statements of operations for the applicable period. The fair value of the interest rate swaps of $4.5 million and $4.1 million are included in “Other long term liabilities” in the Company’s condensed consolidated balance sheets as of September 30, 2015 and June 30, 2015, respectively. During the three months ended September 30, 2015 and 2014, $0.4 million and $(2.0) million were recorded as an increase/(decrease) in interest expense for the change in the fair value of the interest rate swaps.

Income Taxes

Income Taxes	3 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	(6) INCOME TAXES The Company’s provision for income taxes from operations is summarized as follows: Three months ended September 30, 2015 2014 Current Income Taxes Federal $ 0.1 $ 1.5 State 0.4 0.9 Foreign 0.2 0.8 Total $ 0.7 $ 3.2 Deferred Income Taxes Federal $ 1.7 $ 6.3 State (0.2 ) 0.2 Foreign 0.5 (0.3 ) Total 2.0 6.2 Total provision for income taxes $ 2.7 $ 9.4 The United States and foreign components of loss from operations before income taxes for the three months ended September 30, 2015 and 2014 are as follows: Three months ended September 30, 2015 2014 United States $ (13.7 ) $ (92.6 ) Foreign 1.2 (8.5 ) Total $ (12.5 ) $ (101.1 ) The Company’s effective income tax rate differs from what would be expected if the federal statutory rate were applied to earnings before income taxes primarily because of certain expenses that represent permanent differences between book and tax expenses and deductions, such as the stock-based compensation expense related to the common units of Communications Infrastructure Investments, LLC (“CII”) that is recorded as an expense for financial reporting purposes but is not deductible for tax purposes (see Note 7 – Equity 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, 2015 and 2014 is as follows: Three months ended September 30, 2015 2014 Expected benefit at the statutory rate $ (4.2 ) $ (35.3 ) Increase/(decrease) due to: Non-deductible stock-based compensation 7.4 47.3 State income taxes benefit, net of federal benefit (0.6 ) (4.5 ) Transaction costs not deductible for tax purposes — 0.2 Foreign tax rate differential (0.1 ) 1.1 Other, net 0.2 0.6 Provision for income taxes $ 2.7 $ 9.4 Each interim period, management estimates the annual effective tax rate and applies that rate to its reported year-to-date earnings. The tax expense or benefit related to items for which management is unable to make reliable estimates or that are significant, unusual, or extraordinary items that will be separately reported, or reported net of their related tax effect, are individually computed and are recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws, tax rates or tax status is recognized in the interim period in which the change occurs. The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgments, including but not limited to the expected operating income for the year, projections of the proportion of income earned and taxed in various jurisdictions, permanent differences, and the likelihood of realizing deferred tax assets generated in both the current year and prior years. The accounting estimates used to compute the interim provision for income taxes may change as new events occur, more experience is acquired, additional information is obtained, or the tax environment changes.

Equity

Equity	3 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Equity	(7) EQUITY Prior to October 16, 2014, the Company was a wholly owned subsidiary of CII. CII was organized on November 6, 2006, and subsequently capitalized on May 7, 2007, with capital contributions from various institutional and founder investors. Prior to October 16, 2014, the Company was controlled by the CII board of managers, which was in turn controlled by the members of CII in accordance with the rights specified in CII’s operating agreement. At formation, 1,000 shares of common stock, par value $0.001, were issued to CII by the Company. On October 9, 2014, the Company’s Board of Directors authorized a 223,000-for-one split of the Company’s common stock that was effective upon the filing of the Company’s amended and restated certificate of incorporation on October 10, 2014. Subsequent to the stock split and prior to the Company’s initial public offering (“IPO”) in October 2014, 223,000,000 shares of common stock with a par value of $0.001 were outstanding and are retroactively reflected in the Company’s consolidated financial statements and notes thereto. As part of the Company’s IPO in October 2014, the Company sold 16,008,679 shares of its common stock at a price of $19.00 per share for $304.2 million in gross proceeds. The Company incurred costs directly associated with the IPO of $22.2 million. In March 2015, the Company completed a follow-on equity offering selling 4,000,000 shares of its common stock at a price of $27.35 per share for $109.5 million in gross proceeds. The Company incurred costs directly associated with the follow-on offering of $4.3 million. Proceeds from the IPO and the follow-on equity offering (net of issuance costs) of $387.2 million were reflected on the Company’s consolidated statement of stockholders’ equity during the year ended June 30, 2015. During the three months ended September 30, 2015, the Company recorded a $43.6 million increase in additional paid-in capital 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, 2015
Share Based Compensation [Abstract]
Stock-Based Compensation	(8) STOCK-BASED COMPENSATION The following table summarizes the Company’s stock-based compensation expense liability and equity classified awards included on the condensed consolidated statements of operations. Three months ended September 30, Included in: 2015 2014 Operating costs $ 6.7 $ 14.4 Selling, general and administrative expenses 39.4 108.7 Total stock-based compensation expense $ 46.1 $ 123.1 CII common and preferred units $ 19.5 $ 123.1 Part A restricted stock units 10.0 — Part B restricted stock units 16.4 — Part C restricted stock units 0.2 — Total stock-based compensation expense $ 46.1 $ 123.1 CII Common Units Prior to the Company’s IPO, the Company was given authorization by CII to award 625,000,000 of CII’s common units as profits interests to employees, directors, and affiliates of the Company. The common units were historically considered to be stock-based compensation with terms that required the awards to be classified as liabilities due to cash settlement features. The vested portion of the awards was reported as a liability and the fair value was re-measured at each reporting date until the date of settlement, with a corresponding charge (or credit) to stock-based compensation expense. In connection with the Company’s IPO and the related amendment to the CII operating agreement, there was a deemed modification to the stock compensation arrangements with the Company’s employees and directors. As a result, previously issued common units which were historically accounted for as liability awards, became classified as equity awards. Prior to reclassifying the common unit liability to equity, the Company re-measured the fair value of the CII common units factoring in the change in fair value since September 30, 2014 and the change in fair value caused by the modification. The fair value of these previously vested common units was estimated to be $490.2 million on the modification date and this amount was recorded as an increase to additional-paid-in-capital during the year ended June 30, 2015. The fair value of the unrecognized compensation expense associated with unvested CII common units is being recognized over the remaining vesting period of the Company’s outstanding common units through May 15, 2017. On October 9, 2014, the Company and CII’s board of managers approved a non-liquidating distribution by CII of shares of the Company's common stock held by CII to holders of CII vested common units. Employees and independent directors of the Company with vested CII common units received shares of the Company’s common stock equal in value to the underlying value of their vested CII common units. The total number of shares of the Company’s common stock that were distributed to CII common unit holders in connection with this non-liquidating distribution was 20,460,047 shares. Employees with unvested CII common units at the time of the IPO have and/or will continue to receive monthly distributions from CII of the Company’s common stock as they vest under the original terms of the CII common unit grant agreements. A total of 6,353,302 shares of the Company’s common stock are associated with unvested CII common units that have or will be distributed subsequent to the IPO date. In addition, CII has and may in the future be required to distribute additional shares of the Company’s common stock to CII common unit holders on a quarterly basis based on the Company’s stock price performance through June 30, 2016 results, subject to the existing vesting provisions of the CII common units. The shares to be distributed to the common unit holders are based on a pre-existing distribution mechanism, whose primary input is the Company’s stock price at each subsequent measurement date. Any remaining shares of common stock owned by CII will be distributed to the existing CII preferred unit holders. The total number of shares of the Company’s common stock that have or will be distributed to existing CII preferred or common unit holders subsequent to the IPO date is 10,294,867 shares. The valuation of the CII common units as of the IPO date was determined based on a Monte Carlo simulation. The Monte Carlo valuation analysis attempts to approximate the probability of certain outcomes by running multiple trial runs, called simulations, using random variables to generate potential future stock prices. This valuation technique was used to estimate the fair value associated with future distributions of common stock to CII common unit holders. The Monte Carlo simulation first projects the number of shares to be distributed by CII to the common unit holders at each subsequent measurement date based on stock price projections under each simulation. Shares attributable to unvested CII common units are subject to the existing vesting provisions of the CII common unit awards. The estimated future value of shares scheduled to be distributed by CII based on vesting provisions are calculated under each independent simulation. The present value of the number of shares of common stock to be distributed to common unit holders under each simulation is then computed, and the average of each simulation is the fair value of the Company’s common shares to be distributed by CII to the common unit holders. This value was then adjusted for prior non-liquidating distributions made by the Company to derive a value for CII common units by class and on per unit basis. These values were used to calculate the fair value of outstanding CII common units as of the IPO date. Various inputs and assumptions were utilized in the valuation method, including forfeiture behavior, vesting provisions, holding restrictions, peer companies’ historical stock volatility, and an appropriate risk-free rate. During the three months ended September 30, 2015 and 2014, the Company recognized $19.5 million and $123.1 million, respectively, of stock-based compensation expense related to vesting of CII common units. As of September 30, 2015, the unrecognized compensation associated with unvested CII common units was $50.7 million. CII Preferred Units CII has issued preferred units of CII to certain of the Company’s executives and independent directors as compensation. The terms of these preferred unit awards require the Company to record the awards as equity awards. The Company estimates the fair value of these equity awards on the grant date and recognizes the related expense over the vesting period of the awards. As these awards have been issued by CII to employees and directors of the Company as compensation, the related expense has been recorded by the Company in the accompanying condensed consolidated statements of operations. The Company recognized stock-based compensation and a related increase to the Company’s additional paid-in capital of nil and $0.1 million during the three months September 30, 2015 and 2014, respectively. In connection with the non-liquidating distribution by CII approved on October 9, 2014, the Company’s CEO and independent directors with vested CII preferred units received 256,265 shares of the Company’s common stock equal to the underlying value of their vested CII preferred units. A total of 29,555 shares of the Company’s common stock associated with CII preferred units that were unvested at the time of the IPO Performance Incentive Compensation Plan (“PCIP”) During October 2014, the Company adopted the 2014 Performance Compensation Incentive Plan (“PCIP”). The PCIP includes incentive cash compensation (ICC) 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 the Company’s Board of Directors. The PCIP has the following components: Part A Under Part A of the PCIP, participants, including the Company’s executives, are eligible to earn quarterly awards of RSUs. Each participant in Part A of the PCIP has a RSU target annual award value. Twenty-five percent of this annual target award value is allocated to each fiscal quarter. The final Part A value awarded to a participant for any fiscal quarter is determined by the Compensation Committee subsequent to the end of the respective performance period taking into account the Company’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 is calculated based on the final award value determined by the Compensation Committee divided by the average closing price of the Company’s common stock over the last ten trading days of the measured performance period. Part A RSUs vest based upon continued employment through one year after the last day of the quarter in which the Part A RSU grant is made, and at that time will be exchanged for an equal number of shares in the Company’s common stock. During the three months ended September 30, 2015, the Company recognized $10.0 million of compensation expense associated with the vested portion of the Part A awards. The September 2015 and June 2015 quarterly awards were recorded as liabilities totaling $2.4 million and $1.9 million, as of September 30, 2015 and June 30, 2015, 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. Upon the issuance of the RSUs, the liability is re-measured and then reclassified to additional paid-in capital, 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, 2015, the remaining unrecognized compensation cost to be expensed over the remaining vesting period for Part A awards is $17.7 million. The following table summarizes the Company’s Part A RSU activity for the three months ended September 30, 2015: Number of Part A RSUs Weighted average grant-date fair value per share Weighted average remaining contractual term in months Outstanding at July 1, 2015 933,217 $ 26.25 7.1 Granted 547,635 $ 28.62 12.0 Forfeited (14,665 ) $ 27.55 n/a Outstanding at September 30, 2015 1,466,187 $ 27.10 9.0 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 the Company’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 grant and vest, assuming continuous employment through the end of the measurement period. The existence of a vesting provision that is associated with the performance of the Company’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 the Company’s common stock. The following table summarizes the Company’s Part B RSU activity for the three months ended September 30, 2015: Number of Part B RSUs Weighted average grant-date fair value per unit Weighted average remaining contractual term in months Outstanding at July 1, 2015 1,249,873 $ 42.91 5.5 Granted 272,813 $ 17.83 9.0 Vested (575,660 ) $ 63.12 n/a Outstanding at September 30, 2015 947,026 $ 23.41 5.8 The table below reflects the total Part B RSUs granted during Fiscal 2016 and 2015, the maximum eligible shares of the Company’s stock that the respective Part B RSU grant could be converted into, and the grant date fair value per Part B RSU: During the three months ended September 30, 2015 June 30, 2015 March 31, 2015 December 31, 2014 Part B RSUs granted 272,813 316,353 359,658 575,660 Maximum eligible shares of the Company's stock 1,426,812 1,490,023 1,388,280 2,222,048 Grant date fair value per Part B RSU $ 17.83 $ 27.10 $ 24.36 $ 63.12 During the three months ended September 30, 2015, the Company recognized stock-based compensation expense of $16.4 million 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 $10.5 million at September 30, 2015. Part C Under Part C of the PCIP, independent directors of the Company 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 the Company’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, 2015, the Company’s independent directors were granted 7,952 Part C RSUs. All Part C RSUs issued during the quarter vested as of September 30, 2015. The Company recognized $0.2 million of compensation expense associated with the Part C RSUs.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	(9) FAIR VALUE MEASUREMENTS The Company’s financial instruments consist of cash and cash equivalents, restricted cash, trade receivables, accounts payable, interest rate swaps, long-term debt 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, 2015 and June 30, 2015 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 unamortized premium, and was $2,112.5 million and $2,112.7 million as of September 30, 2015 and June 30, 2015, 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, 2015 and June 30, 2015 was estimated to be $2,093.3 million and $2,109.3 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, net of the unamortized discounts, and was $1,623.6 million and $1,627.0 million as of September 30, 2015 and June 30, 2015, respectively. The Company’s Term Loan Facility accrues interest at variable rates based upon the one month, three month or six month LIBOR (with a LIBOR floor of 1.00%) plus a spread of 2.75%. Since management does not believe that the Company’s credit quality has changed significantly since the date when the Term Loan Facility was last amended on May 6, 2015, its carrying amount approximates fair value. Excluding any offsetting effect of the Company’s interest rate swaps, 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 $16.4 million. The Company’s interest rate swaps are valued using discounted cash flow techniques that use observable market inputs, such as LIBOR-based yield curves, forward rates, and credit ratings. Changes in the fair value of the interest rate swaps of $0.4 million and $(2.0) million were recorded as an increase/(decrease) to interest expense during the three months ended September 30, 2015 and 2014, respectively. A hypothetical increase in LIBOR rates of 100 basis points would favorably increase the fair value of the interest rate swaps by approximately $10.0 million. As of September 30, 2015 and June 30, 2015, there was no balance outstanding under the Company's Revolver. Financial instruments measured at fair value on a recurring basis are summarized below: Level September 30, June 30, 2015 Liabilities Recorded at Fair Value in the Financial Statements: Interest rate swap Level 2 $ 4.5 $ 4.1

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Sep. 30, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments And Contingencies	(10) COMMITMENTS AND CONTINGENCIES Purchase commitments At September 30, 2015, the Company was contractually committed for $257.9 million of capital expenditures for construction materials and purchases of property and equipment. A majority of these purchase commitments are expected to be satisfied in the next twelve months. These purchase commitments are primarily success based; that is, the Company has executed customer contracts that support the future capital expenditures. Contingencies In the normal course of business, the Company is party to various outstanding legal proceedings, asserted and unasserted claims, and carrier 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.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Party Transactions	(11) RELATED PARTY TRANSACTIONS The Company spun-off the Onvoy, LLC and subsidiaries (“OVS”) business to CII on June 13, 2014. CII holds approximately 4% of the Company’s outstanding common stock at September 30, 2015. The Company continues to have ongoing contractual relationships with OVS, whereby the Company provides OVS and its subsidiaries with bandwidth capacity and OVS provides the Company and its subsidiaries with voice services. The contractual relationships are based on agreements that were entered into at estimated market rates. Subsequent to the spin-off date, transactions with OVS are included in the Company’s results of operations. The following table represents the revenue and expense transactions the Company recorded with OVS for the periods presented: Three months ended September 30, 2015 2014 Revenues $ 1.7 $ 1.7 Operating costs $ 0.1 $ 0.3 As of September 30, 2015 and June 30, 2015, the Company had outstanding balances of $0.3 million and $0.6 million, respectively, due from OVS. 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 quarterly and annual maximum reimbursement thresholds approved by the Company's Nominating and Governance Committee. During the three months ended September 30, 2015 and 2014, respectively, the Company reimbursed Mr. Caruso $0.1 million and $0.4 million for his business use of the aircraft. On June 28, 2012, Matt Erickson, the President of Zayo Physical Infrastructure, purchased $0.6 million in aggregate principal amount of 2020 Unsecured Notes at the offering price for such notes. Mr. Erickson qualifies as an “accredited investor” (as defined in Rule 501 under the Securities Act), and this purchase was on terms available to other investors. On December 15, 2014, in connection with the Note Redemption, approximately $0.2 million of Mr. Erickson’s notes were redeemed, and as of September 30, 2015, the principal amount of 2020 Unsecured Notes held by Mr. Erickson was $0.4 million.

Segment Reporting

Segment Reporting	3 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	(12) SEGMENT REPORTING The Company’s chief operating decision maker (“CODM”) is its Chief Executive Officer. The Company’s individual strategic product groups (“SPGs”) are organized into three operating segments based on the similarities of business activities: Physical Infrastructure, Cloud and Connectivity and Other. The Company’s operating segments are also its reporting segments. The Physical Infrastructure operating segment is comprised of the following SPGs: Dark Fiber, Mobile Infrastructure, and Zayo Colocation (“zColo”). The Cloud and Connectivity operating segment is comprised of the following SPGs: Wavelengths, Ethernet, IP, SONET and Cloud. SPGs report directly to the segment managers who are responsible for the operations and financial results for the Physical Infrastructure, Cloud and Connectivity and Other reportable segments. The segment managers for each of the Physical Infrastructure, Cloud and Connectivity and Other operating segments report directly to the CODM, and it is the financial results of those segments that are evaluated and drive the resource allocation decisions. The Company’s three operating segments are described below: Physical Infrastructure . Through the Physical Infrastructure segment, the Company provides raw bandwidth infrastructure to customers that require more control of their internal networks. These services include dark fiber, mobile infrastructure (fiber-to-the-tower and small cell), and colocation and interconnection. 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 its customers, who “light” the fiber using their own optronics. The Company’s mobile infrastructure services provide direct fiber connections to cell towers, small cells, hub sites, and mobile switching centers. The Company’s datacenters offer colocation and interconnection services to its customers, who then house and power the Company’s computing and networking equipment for the purpose of aggregating and distributing data, voice, Internet, and video traffic. Physical Infrastructure 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 Physical Infrastructure segment generally tend to range from three to twenty years. Cloud and Connectivity . The Cloud and Connectivity segment provides bandwidth infrastructure solutions over the Company’s metro, regional, and long-haul fiber networks where it uses optronics to light the fiber and the Company’s customers pay for access based on the amount and type of bandwidth they purchase. The Company’s services within this segment include wavelength, Ethernet, IP, SONET, and cloud services with capacity ranging from 1.54Mb to 100G. The Company targets customers who require a minimum of 10G of bandwidth across their networks. Cloud and Connectivity customers include carriers, financial services companies, healthcare, government institutions, education institutions and other enterprises. The contract terms in this segment tend to range from two to five years. Other . The Other segment is primarily comprised of ZPS. ZPS provides network and technical resources to customers in designing, acquiring and maintaining their networks. Services are typically provided for a term of one year for a fixed recurring monthly fee in the case of network and on an hourly basis for technical resources (usage revenue). Revenues for all of the Company’s products are included in one of the Company’s three segments. 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 and rational. 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. 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 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, 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, 2015 Physical Infrastructure Cloud and Connectivity Other Corp/ Eliminations Total Revenue from external customers $ 183.7 $ 176.6 $ 6.5 $ — $ 366.8 Segment Adjusted EBITDA 120.6 93.1 1.7 — 215.4 Total assets 3,732.5 1,978.0 36.3 419.1 6,165.9 Capital expenditures 109.0 50.2 — — 159.2 As of and for the three months ended September 30, 2014 Physical Infrastructure Cloud and Connectivity Other Corp/ Eliminations Total Revenue from external customers $ 154.0 $ 160.5 $ 6.1 $ — $ 320.6 Segment Adjusted EBITDA 98.4 83.2 1.4 — 183.0 Capital expenditures 69.0 46.3 — — 115.3 As of June 30, 2015 Physical Infrastructure Cloud and Connectivity Other Corp/ Eliminations Total Total assets 3,694.4 1,976.0 35.0 389.2 6,094.6 Reconciliation from Total Segment Adjusted EBITDA to net loss from operations: For the three months ended September 30, 2015 2014 Total Segment Adjusted EBITDA $ 215.4 $ 183.0 Interest expense (53.8 ) (46.9 ) Depreciation and amortization expense (117.1 ) (96.0 ) Transaction costs — (3.4 ) Stock-based compensation (46.1 ) (123.1 ) Unrealized foreign currency loss (10.7 ) (14.7 ) Non-cash loss on investments (0.2 ) — Provision for income taxes (2.7 ) (9.4 ) Net loss $ (15.2 ) $ (110.5 )

Subsequent Events

Subsequent Events	3 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	(13) SUBSEQUENT EVENTS Change to Reportable Segments As of September 30, 2015, the Company’s SPGs were organized into three reportable segments based on the similarities of business activities: Physical Infrastructure, Cloud and Connectivity and Other. The Physical Infrastructure reporting segment was comprised of the following SPGs: Dark Fiber, Mobile Infrastructure, and zColo. The Cloud and Connectivity reporting segment was comprised of the following SPGs: Wavelengths, Ethernet, IP, SONET and Cloud. During the second quarter of Fiscal 2016, the Company initiated a change to its reporting segments in an effort to meet the needs of the Company’s growth and intensify its focus on key global opportunities. The new reportable segments will include the following: Dark Fiber Solutions, Network Connectivity Services, Cloud and Colocation Infrastructure and Other. The Dark Fiber Solutions segment will include the Company’s Dark Fiber and MIG SPGs. The Network Connectivity Services segment will include the Company’s Waves, Ethernet, IP and Sonet product groups. The Cloud and Colocation Infrastructure segment will include the Company’s zColo and Cloud SPGs. The Other segment will be unchanged from the Company’s existing Other segment. The Company will beginning reporting operating results for the new reportable segments in the Company’s Form 10-Q to be filed with the SEC covering the three and six month period ended December 31, 2015. Historical reporting segment results will be restated to reflect the change. Amendment to Stockholder Agreement & Share Repurchase Program On November 9, 2015, the Company delivered a notice of waiver (the “Waiver”) relating to that certain Stockholders Agreement between the Company and each of the stockholders party thereto (the “Participants”), dated as of October 22, 2014 (as amended, the “Stockholders Agreement”), pursuant to which the Company waived the transfer restrictions contained in Article III of the Stockholders Agreement, including without limitation all restrictions on the transfer of the Company’s common stock by Participants, effective on November 16, 2015. The Waiver will release the contractual transfer restrictions on approximately 156 million shares of the Company’s common stock. On November 10, 2015, the Company announced that in conjunction with the Waiver, the Company’s Board of Directors had authorized a $ Viatel Acquisition On November 10, 2015, the Company entered into a definitive agreement to acquire Viatel Infrastructure Europe Ltd, Viatel (UK) Limited, Viatel France SAS, Viatel Deutschland GmbH and Viatel Nederland BV (“Viatel”). Viatel is a wholly owned subsidiary of Digiweb Holdings Ltd, a full service telecommunications and managed services operator, based in Dundalk, Ireland. The purchase price is approximately $102.0 million (€95.0 million), subject to certain post-closing adjustments. The Viatel acquisition will provide Zayo with Pan-European intercity and metro fiber capability via a 8,400 kilometer fiber network across eight countries. The transaction will add 12 new metro networks, seven data centers and connectivity to 81 on-net buildings. Two wholly-owned subsea cable systems will provide connectivity on two of Europe’s key routes – London-Amsterdam and London-Paris. The Viatel businesses to be acquired are highly aligned with Zayo’s existing product and customer set, including a higher proportion of dark fiber revenue. The Company anticipates the acquisition to close during the three months ended December 31, 2015, subject to regulatory approvals.

Business and Basis of Present21

Business and Basis of Presentation (Policies)	3 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
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, 2015 included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2015. In the opinion of management, all adjustments considered necessary for a 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 month period ended September 30, 2015 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 ended June 30, 2015 as “Fiscal 2015” and the fiscal year ending June 30, 2016 as “Fiscal 2016.”
Earnings or Loss per Share	Earnings or Loss per Share Basic earnings or loss per share attributable to the Company’s common shareholders is computed by dividing net earnings or loss attributable to common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings or loss per share attributable to common shareholders presents the dilutive effect, if any, on a per share basis of potential common shares (such as restricted stock units) as if they had been vested or converted during the periods presented. No such items were included in the computation of diluted loss per share for the three months ended September 30, 2015 and 2014 as the Company incurred a loss from continuing operations in those periods and the effect of inclusion would have been anti-dilutive.
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. Significant 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 and estimating the common unit and 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 September 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2015-16, Simplifying the Accounting for Measurement-Period Adjustments, which requires acquirers who have reported provisional amounts for items in a business combination to recognize adjustments to provisional amounts that are identified during the measurement period, in the reporting period in which the adjustments are determined. The ASU also requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. Prior to the issuance of ASU 2015-16, adjustments to provisional amounts were required to be retrospectively adjusted. The Company prospectively early-adopted ASU 2015-16 effective July 1, 2015. The adoption of this standard did not have a material impact on the financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Schedule of Acquisitions	The table below reflects the Company's estimates of the acquisition date fair values of the assets and liabilities assumed from its Fiscal 2015 acquisitions: AtlantaNAP Neo IdeaTek Latisys Acquisition date July 1, 2014 July 1, 2014 January 1, 2015 February 23, 2015 Cash $ — $ 4.2 $ — $ 9.4 Other current assets 0.2 9.5 0.8 17.2 Property and equipment 7.0 31.3 32.3 222.9 Deferred tax assets, net — — 2.9 0.7 Intangibles 21.0 26.4 7.6 250.2 Goodwill 25.2 32.5 38.8 279.3 Other assets — 2.3 — 5.0 Total assets acquired 53.4 106.2 82.4 784.7 Current liabilities 1.5 13.5 4.5 10.0 Deferred revenue — 3.7 25.2 3.2 Deferred tax liability, net — 7.6 — 84.3 Other liabilities — 3.3 — — Total liabilities assumed 1.5 28.1 29.7 97.5 Net assets acquired 51.9 78.1 52.7 687.2 Less cash acquired — (4.2 ) — (9.4 ) Net consideration paid $ 51.9 $ 73.9 $ 52.7 $ 677.8

Goodwill (Tables)

Goodwill (Tables)	3 Months Ended
	Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule Of Goodwill	The following reflects the changes in the carrying amount of goodwill during the three months ended September 30, 2015: Product Group As of June 30, 2015 Adjustments to Fiscal 2015 Acquisitions Foreign Currency Translation and Other As of September 30, 2015 Dark Fiber $ 299.1 $ — $ (3.2 ) $ 295.9 Waves 265.6 — (1.9 ) 263.7 Sonet 50.3 — — 50.3 Ethernet 104.2 — — 104.2 IP 86.3 — — 86.3 MIG 73.4 — — 73.4 zColo 273.2 (0.5 ) — 272.7 Cloud 57.0 — — 57.0 Other 15.3 — — 15.3 Total $ 1,224.4 $ (0.5 ) $ (5.1 ) $ 1,218.8 During the three months ended September 30, 2015, the Company recorded adjustments to its provisional accounting estimates associated with working capital account balances acquired from the Latisys acquisition, which resulted in a $0.5 million reduction to goodwill.

Intangible Assets (Tables)

Intangible Assets (Tables)	3 Months Ended
	Sep. 30, 2015
Intangible Assets Net Excluding Goodwill [Abstract]
Schedule of Identifiable Acquisition Related Intangible Assets	Identifiable acquisition-related intangible assets as of September 30, 2015 and June 30, 2015 were as follows: Gross Carrying Amount Accumulated Amortization Net September 30, 2015 Finite-Lived Intangible Assets Customer relationships $ 1,077.9 $ (174.9 ) $ 903.0 Trade names 0.2 (0.1 ) 0.1 Underlying rights 1.7 (0.3 ) 1.4 Total 1,079.8 (175.3 ) 904.5 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying Rights 17.3 — 17.3 Total $ 1,100.6 $ (175.3 ) $ 925.3 June 30, 2015 Finite-Lived Intangible Assets Customer relationships $ 1,080.3 $ (155.0 ) $ 925.3 Trade names 0.2 (0.1 ) 0.1 Underlying rights 1.7 (0.2 ) 1.5 Total 1,082.2 (155.3 ) 926.9 Indefinite-Lived Intangible Assets Certifications 3.5 — 3.5 Underlying Rights 17.9 — 17.9 Total $ 1,103.6 $ (155.3 ) $ 948.3

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Schedule of Debt	As of September 30, 2015 and June 30, 2015, long-term debt was as follows: September 30, 2015 June 30, 2015 Term Loan Facility due 2021 $ 1,642.6 $ 1,646.8 10.125% Senior Unsecured Notes due 2020 325.6 325.6 6.00% Senior Unsecured Notes Due 2023 1,430.0 1,430.0 6.375% Senior Unsecured Notes Due 2025 350.0 350.0 Total debt obligations 3,748.2 3,752.4 Unamortized discount on Term Loan Facility (19.0 ) (19.8 ) Unamortized premium on 6.00% Senior Unsecured Notes 6.9 7.1 Unamortized debt issuance costs (68.5 ) (71.0 ) Carrying value of debt 3,667.6 3,668.7 Less current portion (16.5 ) (16.5 ) Long-term debt, less current portion $ 3,651.1 $ 3,652.2

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Schedule of Provision for Income Taxes	The Company’s provision for income taxes from operations is summarized as follows: Three months ended September 30, 2015 2014 Current Income Taxes Federal $ 0.1 $ 1.5 State 0.4 0.9 Foreign 0.2 0.8 Total $ 0.7 $ 3.2 Deferred Income Taxes Federal $ 1.7 $ 6.3 State (0.2 ) 0.2 Foreign 0.5 (0.3 ) Total 2.0 6.2 Total provision for income taxes $ 2.7 $ 9.4
Schedule of Income before Income Tax	The United States and foreign components of loss from operations before income taxes for the three months ended September 30, 2015 and 2014 are as follows: Three months ended September 30, 2015 2014 United States $ (13.7 ) $ (92.6 ) Foreign 1.2 (8.5 ) Total $ (12.5 ) $ (101.1 )
Schedule of Reconciliation of Income Tax Provision	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, 2015 and 2014 is as follows: Three months ended September 30, 2015 2014 Expected benefit at the statutory rate $ (4.2 ) $ (35.3 ) Increase/(decrease) due to: Non-deductible stock-based compensation 7.4 47.3 State income taxes benefit, net of federal benefit (0.6 ) (4.5 ) Transaction costs not deductible for tax purposes — 0.2 Foreign tax rate differential (0.1 ) 1.1 Other, net 0.2 0.6 Provision for income taxes $ 2.7 $ 9.4

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Sep. 30, 2015
Schedule of Employee Service Share-based Compensation Allocation of Recognized Period Costs	The following table summarizes the Company’s stock-based compensation expense liability and equity classified awards included on the condensed consolidated statements of operations. Three months ended September 30, Included in: 2015 2014 Operating costs $ 6.7 $ 14.4 Selling, general and administrative expenses 39.4 108.7 Total stock-based compensation expense $ 46.1 $ 123.1 CII common and preferred units $ 19.5 $ 123.1 Part A restricted stock units 10.0 — Part B restricted stock units 16.4 — Part C restricted stock units 0.2 — Total stock-based compensation expense $ 46.1 $ 123.1
Summary Of Part B RSU Issuance	The table below reflects the total Part B RSUs granted during Fiscal 2016 and 2015, the maximum eligible shares of the Company’s stock that the respective Part B RSU grant could be converted into, and the grant date fair value per Part B RSU: During the three months ended September 30, 2015 June 30, 2015 March 31, 2015 December 31, 2014 Part B RSUs granted 272,813 316,353 359,658 575,660 Maximum eligible shares of the Company's stock 1,426,812 1,490,023 1,388,280 2,222,048 Grant date fair value per Part B RSU $ 17.83 $ 27.10 $ 24.36 $ 63.12
Part A Restricted Stock Units [Member]
Summary Of Restricted Stock Units Activity	The following table summarizes the Company’s Part A RSU activity for the three months ended September 30, 2015: Number of Part A RSUs Weighted average grant-date fair value per share Weighted average remaining contractual term in months Outstanding at July 1, 2015 933,217 $ 26.25 7.1 Granted 547,635 $ 28.62 12.0 Forfeited (14,665 ) $ 27.55 n/a Outstanding at September 30, 2015 1,466,187 $ 27.10 9.0
Part B Restricted Stock Units [Member]
Summary Of Restricted Stock Units Activity	The following table summarizes the Company’s Part B RSU activity for the three months ended September 30, 2015: Number of Part B RSUs Weighted average grant-date fair value per unit Weighted average remaining contractual term in months Outstanding at July 1, 2015 1,249,873 $ 42.91 5.5 Granted 272,813 $ 17.83 9.0 Vested (575,660 ) $ 63.12 n/a Outstanding at September 30, 2015 947,026 $ 23.41 5.8

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis	As of September 30, 2015 and June 30, 2015, there was no balance outstanding under the Company's Revolver. Financial instruments measured at fair value on a recurring basis are summarized below: Level September 30, June 30, 2015 Liabilities Recorded at Fair Value in the Financial Statements: Interest rate swap Level 2 $ 4.5 $ 4.1

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Sep. 30, 2015
O V S [Member]
Revenue and Expense Transactions Recognized	The following table represents the revenue and expense transactions the Company recorded with OVS for the periods presented: Three months ended September 30, 2015 2014 Revenues $ 1.7 $ 1.7 Operating costs $ 0.1 $ 0.3

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Summary of Financial Information by Segments	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, 2015 Physical Infrastructure Cloud and Connectivity Other Corp/ Eliminations Total Revenue from external customers $ 183.7 $ 176.6 $ 6.5 $ — $ 366.8 Segment Adjusted EBITDA 120.6 93.1 1.7 — 215.4 Total assets 3,732.5 1,978.0 36.3 419.1 6,165.9 Capital expenditures 109.0 50.2 — — 159.2 As of and for the three months ended September 30, 2014 Physical Infrastructure Cloud and Connectivity Other Corp/ Eliminations Total Revenue from external customers $ 154.0 $ 160.5 $ 6.1 $ — $ 320.6 Segment Adjusted EBITDA 98.4 83.2 1.4 — 183.0 Capital expenditures 69.0 46.3 — — 115.3 As of June 30, 2015 Physical Infrastructure Cloud and Connectivity Other Corp/ Eliminations Total Total assets 3,694.4 1,976.0 35.0 389.2 6,094.6
Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations	Reconciliation from Total Segment Adjusted EBITDA to net loss from operations: For the three months ended September 30, 2015 2014 Total Segment Adjusted EBITDA $ 215.4 $ 183.0 Interest expense (53.8 ) (46.9 ) Depreciation and amortization expense (117.1 ) (96.0 ) Transaction costs — (3.4 ) Stock-based compensation (46.1 ) (123.1 ) Unrealized foreign currency loss (10.7 ) (14.7 ) Non-cash loss on investments (0.2 ) — Provision for income taxes (2.7 ) (9.4 ) Net loss $ (15.2 ) $ (110.5 )

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Detail) € in Millions	Feb. 25, 2015USD ($)	Feb. 23, 2015USD ($)	Jan. 06, 2015USD ($)CellularTowersBuildingsmi	Jan. 03, 2015	Jul. 03, 2014USD ($)	Jul. 03, 2014EUR (€)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015Acquisition	Jul. 01, 2014USD ($)
Business Acquisition [Line Items]
Number of business combinations completed | Acquisition									34
Acquisition related costs							$ 0	$ 3,400,000
Atlanta NAP [Member]
Business Acquisition [Line Items]
Acquisition date					Jul. 1, 2014	Jul. 1, 2014	Jul. 1, 2014
Business acquisition, percentage of voting interests acquired										100.00%
Cash paid for acquisitions, net of cash acquired					$ 51,900,000
Neo Telecoms [Member]
Business Acquisition [Line Items]
Acquisition date					Jul. 1, 2014	Jul. 1, 2014	Jul. 1, 2014
Business acquisition, percentage of voting interests acquired										96.00%
Cash paid for acquisitions, net of cash acquired					$ 73,900,000	€ 54.1		$ 73,900,000
Purchase price, held in escrow					$ 11,900,000	€ 8.7
Business acquisition percentage of non controlling interest										4.00%
Neo Telecoms [Member] | Other long-term liabilities
Business Acquisition [Line Items]
Business acquisition, fair value of non-controlling interest										$ 2,900,000
Neo Telecoms [Member] | Call Option [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired										4.00%
Ideatek Systems, Inc., [Member]
Business Acquisition [Line Items]
Acquisition date				Jan. 1, 2015			Jan. 1, 2015
Cash paid for acquisitions, net of cash acquired			$ 52,700,000
Purchase price, held in escrow			$ 3,200,000
Additional Route Miles Acquired | mi			1,800
Number Of Additional Cellular Towers connected | CellularTowers			600
Number Of Additional Building connected | Buildings			100
Latisys Holdings, LLC [Member]
Business Acquisition [Line Items]
Acquisition date	Feb. 23, 2015						Feb. 23, 2015
Cash paid for acquisitions, net of cash acquired	$ 677,800,000	$ 677,800,000
Purchase price, held in escrow		$ 31,400,000

Acquisitions (Schedule of Acqui

Acquisitions (Schedule of Acquisition) (Detail) € in Millions, $ in Millions	Feb. 25, 2015USD ($)	Feb. 23, 2015USD ($)	Jan. 06, 2015USD ($)	Jan. 03, 2015	Jul. 03, 2014USD ($)	Jul. 03, 2014EUR (€)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2015USD ($)	Jan. 01, 2015USD ($)	Jul. 01, 2014USD ($)
Business Acquisition [Line Items]
Goodwill							$ 1,218.8		$ 1,224.4
Atlanta NAP [Member]
Business Acquisition [Line Items]
Acquisition date					Jul. 1, 2014	Jul. 1, 2014	Jul. 1, 2014
Other current assets											$ 0.2
Property and equipment											7
Intangibles											21
Goodwill											25.2
Total assets acquired											53.4
Current liabilities											1.5
Total liabilities assumed											1.5
Net assets acquired											51.9
Net consideration paid					$ 51.9
Neo Telecoms [Member]
Business Acquisition [Line Items]
Acquisition date					Jul. 1, 2014	Jul. 1, 2014	Jul. 1, 2014
Cash											4.2
Other current assets											9.5
Property and equipment											31.3
Intangibles											26.4
Goodwill											32.5
Other assets											2.3
Total assets acquired											106.2
Current liabilities											13.5
Deferred revenue											3.7
Deferred tax liability, net											7.6
Other liabilities											3.3
Total liabilities assumed											28.1
Net assets acquired											78.1
Less cash acquired											$ (4.2)
Net consideration paid					$ 73.9	€ 54.1		$ 73.9
Ideatek Systems, Inc., [Member]
Business Acquisition [Line Items]
Acquisition date				Jan. 1, 2015			Jan. 1, 2015
Other current assets										$ 0.8
Property and equipment										32.3
Deferred tax assets, net										2.9
Intangibles										7.6
Goodwill										38.8
Total assets acquired										82.4
Current liabilities										4.5
Deferred revenue										25.2
Total liabilities assumed										29.7
Net assets acquired										$ 52.7
Net consideration paid			$ 52.7
Latisys Holdings, LLC [Member]
Business Acquisition [Line Items]
Acquisition date	Feb. 23, 2015						Feb. 23, 2015
Cash		$ 9.4
Other current assets		17.2
Property and equipment		222.9
Deferred tax assets, net		0.7
Intangibles		250.2
Goodwill		279.3
Other assets		5
Total assets acquired		784.7
Current liabilities		10
Deferred revenue		3.2
Deferred tax liability, net		84.3
Total liabilities assumed		97.5
Net assets acquired		687.2
Less cash acquired		(9.4)
Net consideration paid	$ 677.8	$ 677.8

Goodwill (Narrative) (Detail)

Goodwill (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 1,218.8	$ 1,224.4
Decrease in goodwill due to adjustment of provisional accounting estimates	$ (0.5)

Goodwill (Schedule Of Goodwill)

Goodwill (Schedule Of Goodwill) (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2015USD ($)
Goodwill [Line Items]
Goodwill, beginning Balance	$ 1,224.4
Fiscal Acquisitions	(0.5)
Foreign Currency Translation and Other	(5.1)
Goodwill, ending balance	1,218.8
Dark Fiber [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	299.1
Foreign Currency Translation and Other	(3.2)
Goodwill, ending balance	295.9
Waves [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	265.6
Foreign Currency Translation and Other	(1.9)
Goodwill, ending balance	263.7
Sonet [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	50.3
Goodwill, ending balance	50.3
Ethernet [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	104.2
Goodwill, ending balance	104.2
IP [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	86.3
Goodwill, ending balance	86.3
MIG [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	73.4
Goodwill, ending balance	73.4
zColo [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	273.2
Fiscal Acquisitions	(0.5)
Goodwill, ending balance	272.7
Cloud [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	57
Goodwill, ending balance	57
Other [Member]
Goodwill [Line Items]
Goodwill, beginning Balance	15.3
Goodwill, ending balance	$ 15.3

Intangible Assets (Schedule of

Intangible Assets (Schedule of Identifiable Acquisition Related Intangible Assets) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,079.8	$ 1,082.2
Accumulated Amortization	(175.3)	(155.3)
Total Net	904.5	926.9
Intangible Assets, Gross (Excluding Goodwill)	1,100.6	1,103.6
Intangible Assets, Net	925.3	948.3
Certifications [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	3.5	3.5
Easement indefinite [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount, Indefinite-lived Intangibles	17.3	17.9
Customer relationships [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	1,077.9	1,080.3
Accumulated Amortization	(174.9)	(155)
Total Net	903	925.3
Trade names [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	0.2	0.2
Accumulated Amortization	(0.1)	(0.1)
Total Net	0.1	0.1
Underlying rights [Member]
Schedule Of Intangible Assets Net Excluding Goodwill [Line Items]
Gross Carrying Amount	1.7	1.7
Accumulated Amortization	(0.3)	(0.2)
Total Net	$ 1.4	$ 1.5

Long-Term Debt (Summary of Long

Long-Term Debt (Summary of Long-Term Debt) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015	May. 06, 2015
Debt Instrument [Line Items]
Debt obligations	$ 3,748.2	$ 3,752.4
Unamortized debt issuance costs	(68.5)	(71)
Carrying value of debt	3,667.6	3,668.7
Less current portion	(16.5)	(16.5)
Long-term debt, less current portion	3,651.1	3,652.2
Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Debt obligations	1,642.6	1,646.8
Unamortized discount on Term Loan Facility	(19)	(19.8)
Carrying value of debt	1,623.6	1,627
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unamortized premium on 6.00% Senior Unsecured Notes	6.9	7.1
Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Debt obligations	325.6	325.6
Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt obligations	1,430	1,430
Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt obligations	$ 350	$ 350	$ 344.5

Long-Term Debt (Summary of Lo37

Long-Term Debt (Summary of Long-Term Debt) (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 09, 2015
Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Interest rate	10.125%	10.125%
Maturity date	2,020	2,020
Unsecured Debt [Member] | 6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate	6.00%	6.00%	6.00%
Maturity date	2,023	2,023
Unsecured Debt [Member] | 6.375% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate	6.375%	6.375%
Maturity date	2,025	2,025
Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Maturity date	2,021	2,021

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Detail) - USD ($)	May. 06, 2015	Dec. 15, 2014	Jul. 02, 2012	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2015	Mar. 09, 2015	Jan. 23, 2015	Aug. 13, 2012
Debt Instrument [Line Items]
Outstanding letters of credit				$ 9,200,000
Redemption of notes				4,100,000			$ 5,100,000
Debt obligations				3,748,200,000				$ 3,752,400,000
Debt issuance cost				99,300,000
Unamortized debt issuance cost				68,500,000				71,000,000
Accumulated amortization				30,800,000				28,300,000
Unamortized debt issuance related interest				$ 2,500,000			3,800,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional amount of derivative											$ 750,000,000
Derivative, maturity date				Jun. 30, 2017
Derivative, fixed interest rate											1.67%
Derivative, floor rate											1.25%
Change in fair value of interest rate swap				$ 400,000			$ (2,000,000)
Interest Rate Derivative Liabilities, at Fair Value				$ 4,500,000				$ 4,100,000
Revolver [Member]
Debt Instrument [Line Items]
Percentage of effective interest rate				3.00%				3.00%
Percentage of excess revolver committed to debt payments				35.00%
Standby Letter Of Credit [Member]
Debt Instrument [Line Items]
Unused commitment, percentage				0.25%
Secured Debt [Member] | Revolver [Member]
Debt Instrument [Line Items]
Line of credit facility maturity date				Apr. 17, 2020
Outstanding letters of credit increased				$ 50,000,000
Debt instrument, maturity date				Jan. 31, 2020
Outstanding letters of credit				$ 0
Available borrowing capacity				$ 440,800,000
Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Percentage of effective interest rate				3.75%				3.75%
Maturity date				2,021				2,021
Debt obligations				$ 1,642,600,000				$ 1,646,800,000
2020 Unsecured Notes [Member]
Debt Instrument [Line Items]
Secured debt ratio				4.50
Total indebtedness ratio				525.00%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Premium on debt being accreted				$ 6,900,000				7,100,000
2023 Unsecured Notes [Member]
Debt Instrument [Line Items]
Secured debt ratio				4.50
Total indebtedness ratio				600.00%
2025 Unsecured Notes [Member]
Debt Instrument [Line Items]
Secured debt ratio				4.50
Total indebtedness ratio				600.00%
Unamortized Debt Issuance Costs
Debt Instrument [Line Items]
Loss on extinguishment of debt								$ 23,200,000
Minimum [Member] | Secured Debt [Member] | Revolver [Member]
Debt Instrument [Line Items]
Unused commitment, percentage				0.25%
Maximum [Member] | Secured Debt [Member] | Revolver [Member]
Debt Instrument [Line Items]
Unused commitment, percentage				0.375%
Amendment and Restatement Agreement [Member] | Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 450,000,000
Payment towards principal	$ 4,100,000
Percentage of excess cash flows committed to debt payments	50.00%
10.125% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Redemption premium						$ 23,800,000
10.125% Senior Notes due 2020 [Member] | 2020 Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 500,000,000
Interest rate			10.125%
Maturity date			2,020
10.125% Senior Notes due 2020 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Interest rate				10.125%				10.125%
Maturity date				2,020				2,020
Redemption of notes		$ 174,400,000
Debt obligations				$ 325,600,000				$ 325,600,000
10.125% Senior Notes due 2020 [Member] | Unsecured Debt [Member] | December 15, 2014 [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		110.125%
8.125% Senior Secured Notes [Member]
Debt Instrument [Line Items]
Redemption of notes		$ 75,000,000
8.125% Senior Secured Notes [Member] | December 15, 2014 [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		108.125%
8.125% Senior Secured Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Interest rate					8.125%
Maturity date				2,020
Redemption of notes					$ 675,000,000
Redemption premium					$ 38,800,000
8.125% Senior Secured Notes [Member] | Secured Debt [Member] | Second Note Redemption [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage					105.75%
January Notes Offering [Member]
Debt Instrument [Line Items]
Debt instrument, face amount										$ 700,000,000
March Notes Offering [Member]
Debt Instrument [Line Items]
Debt instrument, face amount									$ 730,000,000
Debt Instrument Issuance At Premium Price Percentage				1.00%
Premium on debt being accreted				$ 7,300,000
6.00% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Cumulative proceeds from issuance of private placement				$ 1,437,300,000
6.00% Senior Notes due 2023 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility maturity date				Apr. 1, 2023
Interest rate				6.00%				6.00%	6.00%
Maturity date				2,023				2,023
Debt obligations				$ 1,430,000,000				$ 1,430,000,000
6.375% Senior Notes due 2025 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility maturity date	May 15, 2025
Debt instrument, face amount	$ 350,000,000
Interest rate				6.375%				6.375%
Maturity date				2,025				2,025
Debt obligations	344,500,000			$ 350,000,000				$ 350,000,000
Loss on extinguishment of debt	$ 8,400,000
LIBOR [Member] | Term Loan Facility due 2021 [Member]
Debt Instrument [Line Items]
Revolver interest rate				2.75%
LIBOR [Member] | Minimum [Member] | Secured Debt [Member] | Revolver [Member]
Debt Instrument [Line Items]
Revolver interest rate				2.00%
LIBOR [Member] | Maximum [Member] | Secured Debt [Member] | Revolver [Member]
Debt Instrument [Line Items]
Revolver interest rate				3.00%
LIBOR [Member] | Amendment and Restatement Agreement [Member] | Term Loan Facility
Debt Instrument [Line Items]
Interest rate decrease	25.00%
Revolver interest rate	2.75%
LIBOR [Member] | Amendment and Restatement Agreement [Member] | Minimum [Member] | Term Loan Facility
Debt Instrument [Line Items]
Revolver interest rate	1.00%

Income Taxes (Summary of (Benef

Income Taxes (Summary of (Benefit)/Provision for Income Taxes from Continuing Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Current Income Taxes
Federal	$ 0.1	$ 1.5
State	0.4	0.9
Foreign	0.2	0.8
Total	0.7	3.2
Deferred Income Taxes
Federal	1.7	6.3
State	(0.2)	0.2
Foreign	0.5	(0.3)
Total	2	6.2
Total provision for income taxes	$ 2.7	$ 9.4

Income Taxes (Income_(Loss) fro

Income Taxes (Income/(Loss) from Continuing Operations Before Income Tax) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
United States	$ (13.7)	$ (92.6)
Foreign	1.2	(8.5)
Loss from operations before income taxes	$ (12.5)	$ (101.1)

Income Taxes (Reconciliations o

Income Taxes (Reconciliations of Actual Income Tax Provision and Tax Computed by Applying United States Federal Rate to Earnings Before Income Taxes) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Expected benefit at the statutory rate	$ (4.2)	$ (35.3)
Non-deductible stock-based compensation	7.4	47.3
State income taxes benefit, net of federal benefit	(0.6)	(4.5)
Transaction costs not deductible for tax purposes		0.2
Foreign tax rate differential	(0.1)	1.1
Other, net	0.2	0.6
Total provision for income taxes	$ 2.7	$ 9.4

Equity (Narrative) (Detail)

Equity (Narrative) (Detail) $ / shares in Units, $ in Millions	Oct. 22, 2014USD ($)$ / sharesshares	Oct. 09, 2014	Sep. 30, 2015USD ($)$ / sharesshares	Mar. 31, 2015USD ($)$ / sharesshares	Jun. 30, 2015$ / sharesshares	Oct. 16, 2014$ / sharesshares	Oct. 10, 2014$ / sharesshares
Stockholders Equity Note [Line Items]
Common stock, shares issued | shares			245,236,924		243,008,679
Common stock, par value | $ / shares			$ 0.001		$ 0.001		$ 0.001
Stock split ratio		223,000
Common stock, shares outstanding | shares			245,236,924		243,008,679		223,000,000
Proceeds from issuance of common stock (net of issuance costs)			$ 387.2
Increase in additional paid-in capital associated with stock-based compensation expense			43.6
Increase to additional paid-in capital associated with a tax benefit from stock-based compensation			7.9
Proceeds from other financing activities			0.8
Gross tax benefit recognized as cash inflow in financing activities			7.9
Excess tax benefit from stock-based compensation			(7.9)
Federal [Member]
Stockholders Equity Note [Line Items]
Net operating loss carryforward balance			$ 7.1
IPO [Member]
Stockholders Equity Note [Line Items]
Shares Issued, Price Per Share | $ / shares	$ 19
Gross proceeds from issuance of common stock	$ 304.2
Common stock issuance costs	$ 22.2
FPO [Member]
Stockholders Equity Note [Line Items]
Proceeds from issuance of common stock, shares | shares				4,000,000
Shares Issued, Price Per Share | $ / shares				$ 27.35
Gross proceeds from issuance of common stock				$ 109.5
Common stock issuance costs				$ 4.3
CII [Member]
Stockholders Equity Note [Line Items]
Common stock, shares issued | shares						1,000
Common stock, par value | $ / shares						$ 0.001
Parent Company [Member] | IPO [Member]
Stockholders Equity Note [Line Items]
Proceeds from issuance of common stock, shares | shares	16,008,679

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary of Stock-based Compensation Expense Liability and Equity Classified Awards Included in Consolidated Statements of Operations) (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 46,100,000		$ 123,100,000
Operating Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	6,700,000		14,400,000
Selling, General and Administrative Expenses [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	39,400,000		108,700,000
Part A Restricted Stock Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	10,000,000
Part B Restricted Stock Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	16,400,000
Part C Restricted Stock Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	200,000
CII [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	100,000	$ 0
CII [Member] | Common and Preferred Units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 19,500,000		$ 123,100,000

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Detail) - USD ($)	Oct. 16, 2014	Oct. 09, 2014	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reclassification of common unit liability to additional paid in capital									$ 490,200,000
Vesting date			May 15, 2017
Common stock distributed in connection with non-liquidating distribution		20,460,047
Total stock-based compensation expense			$ 46,100,000				$ 123,100,000
Award recorded as liability			2,400,000	$ 1,900,000					$ 1,900,000
PCIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incentive plan termination period	10 years
Vested Portion of Part A Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense			$ 10,000,000
Part A Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common unit unvested			1,466,187	933,217					933,217
Total stock-based compensation expense			$ 10,000,000
Unrecognized compensation cost			17,700,000
Award recorded as liability			$ 2,400,000	$ 1,900,000					$ 1,900,000
Number of RSUs, Granted			547,635
Part B Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized			1,426,812	1,490,023	1,388,280	2,222,048			1,490,023
Common unit unvested			947,026	1,249,873					1,249,873
Total stock-based compensation expense			$ 16,400,000
Unrecognized compensation cost			$ 10,500,000
Number of RSUs, Granted			272,813	316,353	359,658	575,660
Part C Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense			$ 200,000
Number of RSUs, Granted			7,952
CII [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized			625,000,000
Total stock-based compensation expense			$ 100,000					$ 0
Common stock distributed in exchange for vested preferred units		256,265
CII [Member] | IPO [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common unit unvested		29,555
CII [Member] | Common Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common unit unvested		6,353,302
Common stock distributed for existing share holders		10,294,867
Total stock-based compensation expense			19,500,000				$ 123,100,000
Unrecognized compensation cost			$ 50,700,000

Stock-Based Compensation (Sum45

Stock-Based Compensation (Summary Of Restricted Stock Units Activity) (Detail) - $ / shares	3 Months Ended				12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015
Part A Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Outstanding beginning balance	933,217
Number of RSUs, Granted	547,635
Number of RSUs, Forfeited	(14,665)
Number of RSUs, Outstanding ending balance	1,466,187	933,217			933,217
Weighted average grant-date fair value per share, Outstanding beginning balance	$ 26.25
Weighted average grant-date fair value per share, Granted	28.62
Weighted average grant-date fair value per share, Forfeited	27.55
Weighted average grant-date fair value per share, Outstanding ending balance	$ 27.10	$ 26.25			$ 26.25
Weighted average remaining contractual term in months	9 years				7 years 1 month 6 days
Weighted average remaining contractual term in months, Granted	12 years
Part B Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs, Outstanding beginning balance	1,249,873
Number of RSUs, Granted	272,813	316,353	359,658	575,660
Number of RSUs, Outstanding ending balance	947,026	1,249,873			1,249,873
Weighted average grant-date fair value per share, Outstanding beginning balance	$ 42.91
Weighted average grant-date fair value per share, Granted	17.83	$ 27.10	$ 24.36	$ 63.12
Weighted average grant-date fair value per share, Forfeited	63.12
Weighted average grant-date fair value per share, Outstanding ending balance	$ 23.41	$ 42.91			$ 42.91
Weighted average remaining contractual term in months	5 years 9 months 18 days				5 years 6 months
Weighted average remaining contractual term in months, Granted	9 years
Number of RSUs, Vested	(575,660)

Stock-Based Compensation (Sum46

Stock-Based Compensation (Summary Of Part B RSUs Granted, Maximum Eligible Shares Of Stock And Grant Date Fair Value Per Part B RSU) (Detail) - Part B Restricted Stock Units [Member] - $ / shares	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Part B RSUs granted	272,813	316,353	359,658	575,660
Shares authorized	1,426,812	1,490,023	1,388,280	2,222,048
Grant date fair value per Part B RSU	$ 17.83	$ 27.10	$ 24.36	$ 63.12

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes	$ 3,667.6		$ 3,668.7
Hypothetical annual interest expense	16.4
Hypothetical increase to interest rate swap fair value	$ 10
Interest Rate Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Hypothetical interest rate increase	1.00%
Change in fair value of interest rate swap	$ 0.4	$ (2)
Term Loan Facility due 2021 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes	$ 1,623.6		1,627
Hypothetical interest rate increase	1.00%
Term Loan Facility due 2021 [Member] | LIBOR [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Floor rate	1.00%
Revolver interest rate	2.75%
Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying value of the notes	$ 2,112.5		2,112.7
Fair value of the notes	$ 2,093.3		$ 2,109.3

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule Of Financial Instruments Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 4.5	$ 4.1

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Detail) $ in Millions	Sep. 30, 2015USD ($)
Commitments And Contingencies Disclosure [Abstract]
Purchase commitments	$ 257.9

Related Party Transactions (Sch

Related Party Transactions (Schedule of Revenue and Expense Transactions) (Detail) - O V S [Member] - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Related Party Transaction [Line Items]
Revenues	$ 1.7	$ 1.7
Operating costs	$ 0.1	$ 0.3

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Detail) - USD ($) $ in Millions	Dec. 15, 2014	Jun. 28, 2012	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015
Related Party Transaction [Line Items]
Due from related parties			$ 0.3		$ 0.6
Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]
Related Party Transaction [Line Items]
Maturity date			2,020		2,020
O V S [Member]
Related Party Transaction [Line Items]
Due from related parties			$ 0.3		$ 0.6
Dan Caruso [Member] | Aircraft Reimbursement [Member]
Related Party Transaction [Line Items]
Payable to related party settled			0.1	$ 0.4
Matt Erickson [Member] | Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]
Related Party Transaction [Line Items]
Amount due to related parties		$ 0.6	$ 0.4
Maturity date		2,020
Redemption of notes to related party	$ 0.2

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Detail)	3 Months Ended
	Sep. 30, 2015DarkFibersegment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Physical Infrastructure [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Number of dark fiber leased to customers	2
Contract term	3 years
Physical Infrastructure [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Number of dark fiber leased to customers	12
Contract term	20 years
Cloud and Connectivity [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Contract term	2 years
Cloud and Connectivity [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) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenue from external customers	$ 366.8	$ 320.6
Segment Adjusted EBITDA	215.4	183
Total assets	6,165.9		$ 6,094.6
Capital expenditures	159.2	115.3
Reportable Segments [Member] | Physical Infrastructure [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	183.7	154
Segment Adjusted EBITDA	120.6	98.4
Total assets	3,732.5		3,694.4
Capital expenditures	109	69
Reportable Segments [Member] | Cloud and Connectivity [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	176.6	160.5
Segment Adjusted EBITDA	93.1	83.2
Total assets	1,978		1,976
Capital expenditures	50.2	46.3
Reportable Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	6.5	6.1
Segment Adjusted EBITDA	1.7	$ 1.4
Total assets	36.3		35
Corporate/eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 419.1		$ 389.2

Segment Reporting (Reconciliati

Segment Reporting (Reconciliation from Segment Adjusted EBITDA to Net Loss from Continuing Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting [Abstract]
Total Segment Adjusted EBITDA	$ 215.4	$ 183
Interest expense	(53.8)	(46.9)
Depreciation and amortization expense	(117.1)	(96)
Transaction costs		(3.4)
Stock-based compensation	(46.1)	(123.1)
Unrealized foreign currency loss	(10.7)	(14.7)
Non-cash loss on investments	(0.2)
Provision for income taxes	(2.7)	(9.4)
Net loss	$ (15.2)	$ (110.5)

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Detail) € in Millions	Nov. 10, 2015USD ($)BuildingsCountryNetworkCableSystemRouteCenterkm	Nov. 10, 2015EUR (€)BuildingsCountryNetworkCableSystemRouteCenter	Sep. 30, 2015segment	Nov. 09, 2015shares
Subsequent Event [Line Items]
Number of reportable segments | segment			3
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock shares released from transfer restrictions | shares				156,000,000
Share repurchase program authorized period	6 months	6 months
Share repurchase program authorizes | $	$ 500,000,000
Subsequent Event [Member] | Vinnie Acquisition [Member]
Subsequent Event [Line Items]
Acquisition date	Nov. 10, 2015	Nov. 10, 2015
Business acquisition purchase price	$ 102,000,000	€ 95
Number of kilometer for fiber network | km	8,400
Number of country with fiber network | Country	8	8
Number of new metro network | Network	12	12
Number of wholly-owned subsea cable systems | CableSystem	2	2
Number of routes connected to wholly-owned subsea cable systems | Route	2	2
Number of data centre	7	7
Number Of Additional Building connected | Buildings	81	81
Business acquisition closing date	Dec. 31, 2015	Dec. 31, 2015