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Segment Information - Segments Internal Financial Reports (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020	Aug. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 450,143	$ 762,557	$ 1,148,754	$ 2,155,764
Earnings (loss) from operations	25,709	66,812	(2,132)	147,032
Assets	3,210,167		3,210,167		$ 3,173,834
Manufacturing
Segment Reporting Information [Line Items]
Revenue	341,939	653,007	852,755	1,800,317
Earnings (loss) from operations	31,341	68,445	23,811	167,693
Wheels, Repair & Parts
Segment Reporting Information [Line Items]
Revenue	80,871	82,024	218,050	259,857
Earnings (loss) from operations	4,173	3,785	6,406	8,219
Leasing & Services
Segment Reporting Information [Line Items]
Revenue	27,333	27,526	77,949	95,590
Earnings (loss) from operations	12,280	11,837	24,590	34,407
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Earnings (loss) from operations	(22,085)	(17,255)	(56,939)	(63,287)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(12,029)	(17,519)	(42,727)	(45,610)
Earnings (loss) from operations	(2,839)	(14,156)	(10,340)	(29,297)
Intersegment Eliminations | Manufacturing
Segment Reporting Information [Line Items]
Revenue	7,451	1,151	30,467	1,269
Earnings (loss) from operations	492	95	3,097	73
Intersegment Eliminations | Wheels, Repair & Parts
Segment Reporting Information [Line Items]
Revenue	2,292	1,527	4,196	12,511
Earnings (loss) from operations	75	(393)	52	(903)
Intersegment Eliminations | Leasing & Services
Segment Reporting Information [Line Items]
Revenue	2,286	14,841	8,064	31,830
Earnings (loss) from operations	2,272	14,454	7,191	30,127
Operating Segments
Segment Reporting Information [Line Items]
Earnings (loss) from operations	(22,085)	(17,255)	(56,939)	(63,287)
Operating Segments | Manufacturing
Segment Reporting Information [Line Items]
Revenue	349,390	654,158	883,222	1,801,586
Earnings (loss) from operations	31,833	68,540	26,908	167,766
Assets	1,413,590		1,413,590		1,301,715
Operating Segments | Wheels, Repair & Parts
Segment Reporting Information [Line Items]
Revenue	83,163	83,551	222,246	272,368
Earnings (loss) from operations	4,248	3,392	6,458	7,316
Assets	265,847		265,847		271,862
Operating Segments | Leasing & Services
Segment Reporting Information [Line Items]
Revenue	29,619	42,367	86,013	127,420
Earnings (loss) from operations	14,552	$ 26,291	31,781	$ 64,534
Assets	878,743		878,743		739,025
Operating Segments | Unallocated, including cash
Segment Reporting Information [Line Items]
Assets	$ 651,987		$ 651,987		$ 861,232

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