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Debt - March 2018 Senior Term Loan Credit Agreement Amendment - Additional Information (Detail) - Acquisition Corp. - USD ($)
Jun. 30, 2019
Sep. 30, 2018
Mar. 14, 2018
Debt Instrument [Line Items]      
Face or principal amount of debt instrument $ 3,030,000,000 $ 2,851,000,000  
March 2018 Senior Term Loan Credit Agreement Amendment      
Debt Instrument [Line Items]      
Face or principal amount of debt instrument     $ 320,000,000
Revolving credit facility outstanding $ 1,326,000,000