Goodwill - Schedule of Changes in Carrying Value of Goodwill (Detail) $ in Thousands	12 Months Ended
	Aug. 31, 2018 USD ($)
Goodwill [Line Items]
Beginning balance	$ 68,590
Addition	8,702	[1]
Translation	919
Ending balance	78,211
Gross goodwill balance before accumulated goodwill impairment losses and other reductions	230,736
Accumulated goodwill impairment losses	(128,209)
Accumulated other reductions	(24,316)
Manufacturing
Goodwill [Line Items]
Beginning balance	25,325
Addition	839	[1]
Translation	919
Ending balance	27,083
Wheels, Repair & Parts
Goodwill [Line Items]
Beginning balance	43,265
Addition	7,863	[1]
Ending balance	$ 51,128

[1] Additions to goodwill relate to the GBW repair shop transaction and Manufacturing includes final adjustments to the Astra purchase price allocation. See Note 3 - Acquisitions.