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Segment Information - Segments Internal Financial Reports (Detail) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2023
Segment Reporting Information [Line Items]      
Revenue $ 3,240.2 $ 3,544.7 $ 3,944.0
Total consolidated revenues 3,240.2 3,544.7 3,944.0
Cost of Revenue 2,632.7 2,986.2 3,502.9
Margin 607.5 558.5 441.1
Selling and administrative 263.3 247.1 235.3
Net gain on disposition of equipment (15.9) (13.1) (17.3)
Asset impairment, disposal, and exit costs, net     46.7
Earnings (loss) from operations 360.1 324.5 176.4
Assets 4,360.6 4,254.5 3,978.4
Depreciation and amortization 121.5 115.6 106.3
Capital expenditures 280.4 398.3 362.1
Manufacturing      
Segment Reporting Information [Line Items]      
Revenue 2,991.2 3,312.4 3,764.1
Cost of Revenue 2,556.6 2,913.0 3,447.4
Margin 434.6 399.4 316.7
Selling and administrative 106.3 90.3 95.5
Net gain on disposition of equipment 0.8 0.4 (3.3)
Asset impairment, disposal, and exit costs, net     46.7
Leasing & Fleet Management      
Segment Reporting Information [Line Items]      
Revenue 249.0 232.3 179.9
Cost of Revenue 76.1 73.2 55.5
Margin 172.9 159.1 124.4
Selling and administrative 29.0 33.6 33.8
Net gain on disposition of equipment (16.7) (13.5) (12.7)
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Revenue 99.5 238.0 284.1
Cost of Revenue 85.3 213.0 255.1
Margin (14.2) (25.0) (29.0)
Intersegment Eliminations | Manufacturing      
Segment Reporting Information [Line Items]      
Revenue 98.9 237.0 282.9
Cost of Revenue 84.7 212.1 254.2
Margin (14.2) (24.9) (28.7)
Intersegment Eliminations | Leasing & Fleet Management      
Segment Reporting Information [Line Items]      
Revenue 0.6 1.0 1.2
Cost of Revenue 0.6 0.9 0.9
Margin   (0.1) (0.3)
Corporate, Non-Segment      
Segment Reporting Information [Line Items]      
Earnings (loss) from operations 128.0 123.2 104.7
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 3,339.7 3,782.7 4,228.1
Cost of Revenue 2,718.0 3,199.2 3,758.0
Earnings (loss) from operations 488.1 447.7 281.1
Operating Segments | Manufacturing      
Segment Reporting Information [Line Items]      
Revenue 3,090.1 3,549.4 4,047.0
Cost of Revenue 2,641.3 3,125.1 3,701.6
Earnings (loss) from operations 327.5 308.7 177.8
Assets 2,085.9 2,172.4 2,141.4
Depreciation and amortization 78.4 72.1 70.8
Capital expenditures 139.9 121.3 89.2
Operating Segments | Leasing & Fleet Management      
Segment Reporting Information [Line Items]      
Revenue 249.6 233.3 181.1
Cost of Revenue 76.7 74.1 56.4
Earnings (loss) from operations 160.6 139.0 103.3
Assets 1,858.4 1,633.6 1,458.1
Depreciation and amortization 43.1 43.5 35.5
Capital expenditures 140.5 277.0 272.9
Operating Segments | Unallocated, including cash      
Segment Reporting Information [Line Items]      
Assets 416.3 448.5 378.9
Operating Segments | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Revenue $ (99.5) $ (238.0) $ (284.1)