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Subsequent Event - Additional Information (Detail) - Credit Facility [Member] - USD ($)
9 Months Ended
Jul. 09, 2021
Jun. 30, 2021
Subsequent Event [Line Items]    
Line of Credit Facility, Description   Company amended its Credit Facility to increase the borrowing availability to $500 million, extend the term to expire by one year to July 2024, with two one-year options to renew, subject to lender approval, and modify certain provisions to provide additional liquidity to the Company.
Additional extension for two one-year periods   May 31, 2023
Line of credit facility, term   3 years
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Amount of borrowing availability $ 500,000,000  
Additional extension for two one-year periods Jul. 31, 2024  
Line of credit facility, term 1 year