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Financing Arrangements - 2025 Term Loan - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 02, 2018
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]      
Debt instrument maturity date   Nov. 15, 2026  
Unamortized debt issuance costs   $ 47,700,000  
Term Loan, Matures January 2025 [Member]      
Debt Instrument [Line Items]      
Unamortized debt issuance costs   23,400,000  
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]
Debt Instrument, Frequency of Periodic Payment   quarterly  
Debt Instrument, Periodic Payment $ 2,400,000    
Debt instrument maturity date Jan. 02, 2025 Jan. 02, 2025 Jan. 02, 2025
Unamortized debt issuance costs   $ 23,400,000  
Term Loan [Member] | Term Loan, Matures January 2025 [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Base rate borrowings 1.25%    
Term Loan [Member] | Term Loan, Matures January 2025 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Base rate borrowings 2.25%    
[1] Interest rate of 2.41% and 4.36% as of September 30, 2020 and 2019, respectively.