Acquisitions (Additional Information) (Detail) (USD $)
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12 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2011
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Oct. 31, 2011
Dartmouth And Nova Scotia [Member]
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Sep. 30, 2012
Contract Termination [Member]
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Sep. 30, 2013
Accrued Liabilities [Member]
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Sep. 30, 2013
Other Noncurrent Liabilities [Member]
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Dec. 28, 2012
Ford Wholesale Co [Member]
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Dec. 28, 2012
Ford Wholesale Co [Member]
Northern California [Member]
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Jul. 31, 2012
Structural Materials Co [Member]
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Jul. 31, 2012
Structural Materials Co [Member]
Los Angeles and Orange Counties [Member]
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Jun. 30, 2012
Cassady Pierce Company [Member]
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Jun. 30, 2012
Cassady Pierce Company [Member]
Pittsburgh [Member]
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Nov. 11, 2012
Fowler Peth Inc [Member]
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Nov. 11, 2011
Fowler Peth Inc [Member]
Wyoming [Member]
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Nov. 11, 2011
Fowler Peth Inc [Member]
Colorado [Member]
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Nov. 11, 2011
Fowler Peth Inc [Member]
Nebraska [Member]
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Aug. 31, 2012
Contractors Roofing Supply Co [Member]
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Aug. 31, 2012
Contractors Roofing Supply Co [Member]
St. Louis Suburb of O'Fallon, MO [Member]
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Nov. 01, 2012
Mcclure-Johnston Co [Member]
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Nov. 01, 2012
Mcclure-Johnston Co [Member]
Pennsylvania [Member]
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Nov. 01, 2012
Mcclure-Johnston Co [Member]
West Virginia [Member]
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Nov. 01, 2012
Mcclure-Johnston Co [Member]
Western Maryland [Member]
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Nov. 01, 2012
Mcclure-Johnston Co [Member]
Georgia [Member]
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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 |