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Lease Commitments - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Lessor and Lessee, Lease, Description [Line Items]      
Accumulated depreciation $ 556,051 $ 497,500  
Depreciation expense 75,300 86,600 $ 62,300
Operating lease rental revenues $ 69,400 38,700 44,700
Finance lease option to extend options to extend up to 15 years    
Lease expense     19,900
Car Hire Utilization Arrangements      
Lessor and Lessee, Lease, Description [Line Items]      
Operating lease rental revenues $ 17,100 11,200 14,000
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 15 years    
Financing lease remaining lease term 77 years    
Equipment on Operating Lease      
Lessor and Lessee, Lease, Description [Line Items]      
Accumulated depreciation $ 34,400 33,400 44,200
Depreciation expense $ 13,800 $ 11,600 $ 13,300