Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	BrightView Holdings, Inc.
Trading Symbol	BV
Entity Central Index Key	0001734713
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		104,842,195
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-38579
Entity Tax Identification Number	464190788
Entity Address, Address Line One	980 Jolly Road
Entity Address, Address Line Two	Blue Bell
Entity Address, City or Town	Pennsylvania
Entity Address, State or Province	Delaware
Entity Address, Country	US
Entity Address, Postal Zip Code	19422
City Area Code	484
Local Phone Number	567-7204