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Acquisitions (Additional Information) (Detail) (USD $)
12 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Oct. 31, 2011
Dartmouth And Nova Scotia [Member]
Sep. 30, 2012
Contract Termination [Member]
Sep. 30, 2013
Accrued Liabilities [Member]
Sep. 30, 2013
Other Noncurrent Liabilities [Member]
Dec. 28, 2012
Ford Wholesale Co [Member]
Dec. 28, 2012
Ford Wholesale Co [Member]
Northern California [Member]
Jul. 31, 2012
Structural Materials Co [Member]
Jul. 31, 2012
Structural Materials Co [Member]
Los Angeles and Orange Counties [Member]
Jun. 30, 2012
Cassady Pierce Company [Member]
Jun. 30, 2012
Cassady Pierce Company [Member]
Pittsburgh [Member]
Nov. 11, 2012
Fowler Peth Inc [Member]
Nov. 11, 2011
Fowler Peth Inc [Member]
Wyoming [Member]
Nov. 11, 2011
Fowler Peth Inc [Member]
Colorado [Member]
Nov. 11, 2011
Fowler Peth Inc [Member]
Nebraska [Member]
Aug. 31, 2012
Contractors Roofing Supply Co [Member]
Aug. 31, 2012
Contractors Roofing Supply Co [Member]
St. Louis Suburb of O'Fallon, MO [Member]
Nov. 01, 2012
Mcclure-Johnston Co [Member]
Nov. 01, 2012
Mcclure-Johnston Co [Member]
Pennsylvania [Member]
Nov. 01, 2012
Mcclure-Johnston Co [Member]
West Virginia [Member]
Nov. 01, 2012
Mcclure-Johnston Co [Member]
Western Maryland [Member]
Nov. 01, 2012
Mcclure-Johnston Co [Member]
Georgia [Member]
Business Acquisition [Line Items]                                                
Business acquisition total cost $ 64,600,000 $ 141,100,000                                            
Business acquisition, goodwill 27,800,000 59,900,000                                            
Business Acquisition, sales reported by acquired entity for last annual period               60,000,000   81,000,000   52,000,000   60,000,000       14,000,000   85,000,000        
Business acquisition, purchase price adjustments and post closing indemnification claims, liabilities           3,700,000 3,000,000                                  
Number of Stores 19 22   1         5   6   6   2 5 1   1 14 8 3 1 2
Operating expenses 401,676,000 357,732,000 315,883,000   2,000,000                                      
Legal Fees 700,000 1,000,000                                            
Amount Of Acquisition Prices That Remain In Escrow $ 6,700,000