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Financing Arrangements - 2025 Term Loan - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 02, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]      
Unamortized debt issuance costs   $ 59,270,000  
Term Loan, Matures January 2025 [Member]      
Debt Instrument [Line Items]      
Unamortized debt issuance costs   28,915,000  
Term Loan [Member] | Term Loan, Matures January 2025 [Member]      
Debt Instrument [Line Items]      
Long-term line of credit $ 970,000,000.0 $ 926,535,000 [1] $ 930,726,000 [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   $ 28,900,000  
[1] Interest rate of 4.36% and 4.53% as of September 30, 2019 and 2018, respectively.