Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Aug. 31, 2022
Lessor and Lessee, Lease, Description [Line Items]
Finance lease option to extend	options to extend up to 15 years
Car Hire Utilization Arrangements
Lessor and Lessee, Lease, Description [Line Items]
Operating lease rental revenues	$ 4.8	$ 4.5
Leasing & Management Services
Lessor and Lessee, Lease, Description [Line Items]
Operating lease rental revenues	$ 19.6	$ 15.0
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
Minimum
Lessor and Lessee, Lease, Description [Line Items]
Sublease period	1 year
Financing lease remaining lease term	1 year
Maximum
Lessor and Lessee, Lease, Description [Line Items]
Sublease period	13 years
Financing lease remaining lease term	76 years
Equipment on Operating Lease
Lessor and Lessee, Lease, Description [Line Items]
Accumulated depreciation	$ 54.0		$ 48.6
Depreciation expense	$ 6.0	$ 5.1