Goodwill - Schedule of Changes in Carrying Value of Goodwill (Detail) $ in Millions	12 Months Ended
	Aug. 31, 2022 USD ($)
Goodwill [Line Items]
Beginning balance	$ 132.1
Translation and other adjustments	(4.8)
Ending balance	127.3
Gross goodwill balance before accumulated goodwill impairment losses and other reductions	290.1
Accumulated goodwill impairment losses	(138.2)
Accumulated other reductions	(24.6)
Manufacturing
Goodwill [Line Items]
Beginning balance	88.8
Translation and other adjustments	(4.5)
Ending balance	84.3
Maintenance Services
Goodwill [Line Items]
Beginning balance	43.3
Translation and other adjustments	(0.3)
Ending balance	$ 43.0