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Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Dec. 31, 2024	Jan. 31, 2025	Jun. 30, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-42492
Entity Registrant Name	BEACON ROOFING SUPPLY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4173371
Entity Address, Address Line One	505 Huntmar Park Drive
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Herndon
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20170
City Area Code	571
Local Phone Number	323-3939
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 5,570
Entity Common Stock, Shares Outstanding		61,582,627
Documents Incorporated by Reference [Text Block]	The information required by Part III (Items 10, 11, 12, 13 and 14) will be incorporated by reference from the Registrant’s definitive proxy statement for its 2025 Annual Meeting of Stockholders, which will be filed pursuant to Regulation 14A with the United States Securities and Exchange Commission (“SEC”) within 120 days after the end of the fiscal year to which this report relates.
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0001124941
Document Fiscal Year Focus	2024
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	BECN
Security Exchange Name	NASDAQ
Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ