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Fair Value Measures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Aug. 31, 2022	Aug. 31, 2021
Assets:
Nonqualified savings plan investments		$ 40.3	$ 47.7
Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments		21.4	0.1
Nonqualified savings plan investments		40.3	47.7
Cash equivalents		119.4	228.9
Assets, Fair Value Disclosure, Total		181.1	276.7
Liabilities:
Derivative financial instruments		3.0	10.4
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Assets:
Nonqualified savings plan investments		40.3	47.7
Cash equivalents		119.4	228.9
Assets, Fair Value Disclosure, Total		159.7	276.6
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments	[1]	21.4	0.1
Assets, Fair Value Disclosure, Total	[1]	21.4	0.0
Liabilities:
Derivative financial instruments	[1]	$ 3.0	$ 10.4
[1] Level 2 assets include derivative financial instruments which are valued based on significant observable inputs. See Note 13 - Derivative Instruments for further discussion.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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