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Network
070 - Disclosure - Activity in Allowance for Doubtful Accounts (Detail)
(http://www.beaconroofingsupply.com/role/DisclosureActivityInAllowanceForDoubtfulAccounts)
TableSchedule of Accounts, Notes, Loans and Financing Receivable [Table]
Slicers (applies to each fact value in each table cell)
Accounts, Notes, Loans and Financing Receivable [Line Items]Period [Axis]
2011-10-01 - 2012-09-30
2010-10-01 - 2011-09-30
2009-10-01 - 2010-09-30
Balance at beginning of year
13,816,000  
11,817,000  
13,442,000  
Provision Additions
4,619,000  
7,960,000  
4,622,000  
Write-offs
(4,971,000) 
(5,960,000) 
(6,247,000) 
Balance at end of year
13,464,000  
 
13,816,000  
 
11,817,000