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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 15, 2019	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Class of Stock [Line Items]
Shares of preferred stock authorized for issuance		14,000,000.0
Preferred stock issued		0	0
Preferred stock outstanding		0	0
Number of shares purchased			5,000
Cost of common stock shares purchased			$ 200
Number of shares withheld on stock-based compensation awards		147,092
Values of shares withheld on stock-based compensation awards		$ 3,000
Number of shares withheld for minimum statutory taxes			109,896	561
Values of shares withheld for minimum statutory taxes			$ 3,700	$ 12
Stock repurchased during period, shares	40,000,000.0
Common Stock [Member]
Class of Stock [Line Items]
Number of shares withheld on stock-based compensation awards		147,092
Values of shares withheld on stock-based compensation awards		$ 3,000

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Number Of Shares Withheld For Minimum Statutory Taxes

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Shares Paid for Tax Withholding for Share Based Compensation, Value

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Values Of Withheld Shares

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Cost basis for treasury stock acquired for purposes other than retirement.

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