Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) - USD ($)
2 Months Ended 12 Months Ended
Dec. 13, 2019
Sep. 30, 2019
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]      
Operating lease, expense   $ 9,400,000 $ 11,200,000
Line of Credit      
Debt Instrument [Line Items]      
Assumed debt   30,000,000.0  
Letters of credit outstanding   $ 10,900,000 $ 11,800,000
Subsequent Event      
Debt Instrument [Line Items]      
Operating lease, payments $ 10,000,000.0