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Fair Value Measures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Aug. 31, 2021	Aug. 31, 2020
Assets:
Nonqualified savings plan investments		$ 47,653	$ 35,744
Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments		118	582
Nonqualified savings plan investments		47,653	35,744
Cash equivalents		228,905	203,509
Assets, Fair Value Disclosure, Total		276,676	239,835
Liabilities:
Derivative financial instruments		10,451	15,907
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Assets:
Nonqualified savings plan investments		47,653	35,744
Cash equivalents		228,905	203,509
Assets, Fair Value Disclosure, Total		276,558	239,253
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments	[1]	118	582
Assets, Fair Value Disclosure, Total	[1]	118	582
Liabilities:
Derivative financial instruments	[1]	$ 10,451	$ 15,907
[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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