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Geographic and Product Data (Net Revenues from External Customers by Product Group) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Revenue from External Customer [Line Items]      
Net revenues from external customers $ 2,240,723 $ 2,043,658 $ 1,817,423
Residential Roofing Products [Member]
     
Revenue from External Customer [Line Items]      
Net revenues from external customers 1,100,508 1,023,547 849,970
Non-Residential Roofing Products [Member]
     
Revenue from External Customer [Line Items]      
Net revenues from external customers 822,726 757,906 718,145
Complementary Building Products [Member]
     
Revenue from External Customer [Line Items]      
Net revenues from external customers $ 317,489 $ 262,205 $ 249,308