Revenue Recognition - Summary of Contract Balances (Detail) - USD ($) $ in Millions	9 Months Ended
	May 31, 2023		Aug. 31, 2022
Contract With Customer Asset And Liability [Line Items]
Contract liabilities	$ 54.5	[1],[2]	$ 30.5
Change in contract liabilities	24.0
Accounts Receivable
Contract With Customer Asset And Liability [Line Items]
Contract assets			13.0
Change in contract assets	(13.0)
Inventories
Contract With Customer Asset And Liability [Line Items]
Contract assets	7.9		$ 6.0
Change in contract assets	$ 1.9

[1] (1) Balance includes contract assets and liabilities associated with Gunderson Marine which was disposed of in May 2023. See Note 4 for further discussion.

[2] (2) Contract liabilities balance includes deferred revenue within the scope of Revenue from Contracts with Customers (Topic 606).