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Financing Arrangements - Financing - RSG Acquisition - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 02, 2018
Oct. 01, 2015
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 3,570,000,000 $ 1,450,000,000      
Borrowings under senior notes     $ 0 $ 1,300,000,000 $ 0
Payments of debt issuance costs $ 65,300,000   817,000 $ 65,788,000 $ 1,669,000
Roofing Supply Group [Member]          
Debt Instrument [Line Items]          
Payments of debt issuance costs     $ 31,300,000    
2020 ABL [Member] | Revolving Lines of Credit [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   700,000,000.0      
Proceeds from Lines of Credit   350,000,000.0      
2022 Term Loan [Member] | Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term line of credit   450,000,000.0      
Senior Notes, Matures October 2023 [Member]          
Debt Instrument [Line Items]          
Borrowings under senior notes   $ 300,000,000.0