| Component: (Network and Table) | |
|---|---|
| Network | 154 - Disclosure - Goodwill and Intangibles (Details 2) (http://www.beaconroofingsupply.com/role/GoodwillAndIntangiblesDetails2) |
| Table | Statement [Table] |
| Reporting Entity [Axis] | 0001124941 (http://www.sec.gov/CIK) |
| Class of Stock [Axis] | Class of Stock [Domain] |
| Statement [Line Items] | Period [Axis] | |
|---|---|---|
2016-09-30 | 2015-09-30 | |
Year Ending September 30, | ||
2017 | ||
2018 | ||
2019 | ||
2020 | ||
2021 | ||
Thereafter | ||
Total amortizable intangible assets, net | 390,974,000 | 77,305,000 |