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Financing Arrangements - Financing - Allied Acquisition - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 02, 2018
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 3,570,000,000        
Borrowings under senior notes     $ 300,000,000.0 $ 0 $ 1,300,000,000.0
Payments of debt issuance costs 65,300,000   4,300,000 800,000 $ 65,800,000
Senior Notes, Matures November 2025 [Member]          
Debt Instrument [Line Items]          
Borrowings under senior notes 1,300,000,000        
Revolving Lines of Credit [Member] | 2023 ABL [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 1,300,000,000        
Proceeds from Lines of Credit 525,000,000.0 $ 725,000,000      
Term Loan [Member] | Term Loan, Matures January 2025 [Member]          
Debt Instrument [Line Items]          
Long-term line of credit $ 970,000,000.0   $ 922,300,000 [1] $ 926,500,000 [1]  
[1] Interest rate of 2.41% and 4.36% as of September 30, 2020 and 2019, respectively.