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Leases - Additional Information (Detail)
$ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
Lessee Lease Description [Line Items]  
Short term lease costs $ 6
Variable lease cost $ 1
Minimum [Member]  
Lessee Lease Description [Line Items]  
Lease term 1 year
Maximum [Member]  
Lessee Lease Description [Line Items]  
Lease term 19 years
Lease extension period 15 years
Maximum [Member] | Land [Member]  
Lessee Lease Description [Line Items]  
Lease term 70 years