Mandatory Redeemable Preferred Stock, Effective Conversion Price per Share

No definition available.

Name:	jef_MandatoryRedeemablePreferredStockEffectiveConversionPricePerShare
Namespace Prefix:	jef_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Mandatory Redeemable Preferred Stock, Number of Shares in Conversion

+ References

No definition available.

+ Details

Name:	jef_MandatoryRedeemablePreferredStockNumberOfSharesInConversion
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Other shares issuable

+ References

No definition available.

+ Details

Name:	jef_OtherSharesIssuable
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Potential Maximum Increase to Common Shares Outstanding from Restricted Stock and Other Shares

+ References

No definition available.

+ Details

Name:	jef_PotentialMaximumIncreaseToCommonSharesOutstandingFromRestrictedStockAndOtherShares
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Restricted Cash Awards, Compensation Cost Not Yet Recognized

+ References

No definition available.

+ Details

Name:	jef_RestrictedCashAwardsCompensationCostNotYetRecognized
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Restricted Cash Awards, Compensation Cost Not Yet Recognized, Period For Recognition

+ References

No definition available.

+ Details

Name:	jef_RestrictedCashAwardsCompensationCostNotYetRecognizedPeriodForRecognition
Namespace Prefix:	jef_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_RedeemableConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=jef_SeniorExecutivesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=jef_StockOptionsAndSARsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockAppreciationRightsSARSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=jef_RestrictedStockWithFutureServiceRequiredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=jef_RestrictedStockUnitsWithFutureServiceRequiredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=jef_RestrictedStockUnitsWithNoFutureServiceRequiredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation and benefits expense		$ 10.0	$ 7.0	$ 33.0	$ 71.2
Total unrecognized compensation costs related to nonvested share-based compensation plans	$ 100.9	$ 100.9		$ 100.9
Total unrecognized compensation costs related to nonvested share-based compensation plans, period for recognition	3 years 4 months 24 days
Other shares issuable (in shares)	1,155,000	1,155,000		1,155,000
Potential maximum increase to common shares outstanding from restricted stock and other shares (in shares)	27,415,000	27,415,000		27,415,000
Restricted cash awards, cost expected to be recognized	$ 270.8	$ 270.8		$ 270.8
Restricted cash awards, cost expected to be recognized, period	3 years
Cumulative convertible preferred shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Mandatorily redeemable preferred stock, number of shares in conversion (in shares)	4,440,863	4,440,863		4,440,863
Mandatorily redeemable preferred stock, effective conversion price per share (in dollars per share)	$ 28.15	$ 28.15		$ 28.15
RSUs \| Senior Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation and benefits expense		$ 6.5		$ 18.3
Stock options and SARs \| Senior Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation and benefits expense					48.6
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	5,027,000	5,027,000		5,027,000
Stock options \| Senior Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation and benefits expense					12.9
SAR \| Senior Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation and benefits expense					$ 35.7
Restricted stock with future service required
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-option equity instruments, outstanding (in shares)	961,000	961,000		961,000
Restricted stock units with future service required
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-option equity instruments, outstanding (in shares)	4,245,000	4,245,000		4,245,000
Restricted stock units with no future service required
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-option equity instruments, outstanding (in shares)	12,547,000	12,547,000		12,547,000