Fair Value Measures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Nov. 30, 2024	Aug. 31, 2024
Assets:
Nonqualified savings plan investments		$ 64.4	$ 54.5
Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments		28.8	24.0
Nonqualified savings plan investments		64.4	54.5
Cash equivalents		151.2	195.3
Assets, Fair Value Disclosure, Total		244.4	273.8
Liabilities:
Derivative financial instruments		1.1	1.4
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Assets:
Nonqualified savings plan investments		64.4	54.5
Cash equivalents		151.2	195.3
Assets, Fair Value Disclosure, Total		215.6	249.8
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments	[1]	28.8	24.0
Assets, Fair Value Disclosure, Total	[1]	28.8	24.0
Liabilities:
Derivative financial instruments	[1]	$ 1.1	$ 1.4

[1] Level 2 assets and liabilities include derivative financial instruments that are valued based on observable inputs. See Note 11 - Derivative Instruments to the Condensed Consolidated Financial Statements for further discussion.