Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Registrant Name	BrightView Holdings, Inc.
Trading Symbol	BV
Entity Central Index Key	0001734713
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		93,000,000
Entity Current Reporting Status	Yes
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, Par Value $0.01 Per Share
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-38579
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-4190788
Entity Address, Address Line One	980 Jolly Road
Entity Address, City or Town	Blue Bell
Entity Address, State or Province	PA
Entity Address, Country	US
Entity Address, Postal Zip Code	19422
City Area Code	484
Local Phone Number	567-7204
Document Quarterly Report	true
Document Transition Report	false