Company Overview	12 Months Ended
Sep. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Company Overview	1. Company Overview Beacon Roofing Supply, Inc. (the “Company”) was incorporated in the state of Delaware on August 22, 1997 and is the largest publicly traded distributor of residential and non-residential roofing materials and complementary building products in the United States and Canada. On January 15, 2020, the Company announced the rebranding of its exterior product branches with the trade name “Beacon Building Products” (the “Rebranding”). The new name, and a related logo, were adopted at over 450 Beacon one-step exterior products branches. The Company’s interior, insulation, weatherproofing and two-step branches continue to operate under legacy brand names. The Company operates its business under regional and local trade names and services customers in all 50 states throughout the U.S. and 6 provinces in Canada. The Company’s material subsidiaries are Beacon Sales Acquisition, Inc. and Beacon Roofing Supply Canada Company.

Company Overview

12 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. Company Overview

Beacon Roofing Supply, Inc. (the “Company”) was incorporated in the state of Delaware on August 22, 1997 and is the largest publicly traded distributor of residential and non-residential roofing materials and complementary building products in the United States and Canada.

On January 15, 2020, the Company announced the rebranding of its exterior product branches with the trade name “Beacon Building Products” (the “Rebranding”). The new name, and a related logo, were adopted at over 450 Beacon one-step exterior products branches. The Company’s interior, insulation, weatherproofing and two-step branches continue to operate under legacy brand names.

The Company operates its business under regional and local trade names and services customers in all 50 states throughout the U.S. and 6 provinces in Canada. The Company’s material subsidiaries are Beacon Sales Acquisition, Inc. and Beacon Roofing Supply Canada Company.