Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023	Aug. 31, 2023
Lessor and Lessee, Lease, Description [Line Items]
Accumulated depreciation	$ 83.6		$ 83.6		$ 68.0
Depreciation expense	8.6	$ 6.9	$ 24.8	$ 19.7
Operating lease option to extend			options to extend up to 7 years
Leasing & Management Services
Lessor and Lessee, Lease, Description [Line Items]
Operating lease rental revenues	$ 30.4	$ 23.1	$ 88.5	$ 66.5
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax
Car Hire Utilization Arrangements
Lessor and Lessee, Lease, Description [Line Items]
Operating lease rental revenues	$ 4.5	$ 4.0	$ 15.0	$ 13.7
Minimum
Lessor and Lessee, Lease, Description [Line Items]
Sublease period			1 year
Opreating lease remaining lease term			1 year
Maximum
Lessor and Lessee, Lease, Description [Line Items]
Sublease period			12 years
Opreating lease remaining lease term			74 years