Document And Entity Information - shares	3 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-36690
Entity Registrant Name	Zayo Group Holdings, Inc.
Entity Address, Address Line One	1821 30th Street, Unit A,
Entity Address, City or Town	Boulder
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80301
City Area Code	(303)
Local Phone Number	381-4683
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-1398293
Title of 12(b) Security	Common Stock, par value $0.001 per share
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001608249
Amendment Flag	false
Trading Symbol	ZAYO
Entity Common Stock, Shares Outstanding		236,829,707