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Financing Arrangements - Financing - Allied Acquisition - Additional Information (Detail) - USD ($)
6 Months Ended
Jan. 02, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
[1]
Oct. 01, 2015
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    
Payments of debt issuance costs 65,300,000 0 67,723,000    
Gains (Losses) on Extinguishment of Debt   0 (1,725,000)    
Allied Financing Arrangements [Member]          
Debt Instrument [Line Items]          
Payments of debt issuance costs 2,000,000        
Gains (Losses) on Extinguishment of Debt (1,700,000)        
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        
Term Loan [Member] | Term Loan, Matures January 2025 [Member]          
Debt Instrument [Line Items]          
Long-term line of credit $ 970,000,000 $ 928,631,000 [1] $ 931,909,000 [1] $ 930,726,000  
[1] Interest rate of 4.75%, 4.53% and 3.94% as of March 31, 2019, September 30, 2018 and March 31, 2018, respectively.