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Income Taxes (Activity In Deferred Income Tax Asset Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Income Taxes [Abstract]
Beginning balance	$ 1,685	$ 4,530	$ 15,076
Charged to costs and expenses	212	683	394
Deductions	(584)	(3,528)	(10,940)
Ending balance	$ 1,313	$ 1,685	$ 4,530

X

- Definition

Deferred Tax Assets Valuation Allowance, Charged To Costs And Expenses

+ References

No definition available.

+ Details

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Namespace Prefix:	fc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Assets Valuation Allowance, Deductions

+ References

No definition available.

+ Details

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Namespace Prefix:	fc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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