Percentage of interest acquired in an asset acquisition.

No definition available.

Name:	nucl_AssetAcquisitionPercentageOfInterestAcquired
Namespace Prefix:	nucl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Deemed transaction price per share.

+ References

No definition available.

+ Details

Name:	nucl_DeemedTransactionPricePerShare
Namespace Prefix:	nucl_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum amount to be raised on listing event.

+ References

No definition available.

+ Details

Name:	nucl_ListingEventMinimumAmount
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The additional volume of mineral resource identified under the mineral rights agreement.

+ References

No definition available.

+ Details

Name:	nucl_MineralResourceAdditionalVolume
Namespace Prefix:	nucl_
Data Type:	dtr-types:massItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum volume of mineral resource identified under the mineral rights agreement.

+ References

No definition available.

+ Details

Name:	nucl_MineralResourceMinimumVolume
Namespace Prefix:	nucl_
Data Type:	dtr-types:massItemType
Balance Type:	na
Period Type:	duration

- Definition

The period for extension to exercise the right under the agreement.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsAgreementExtensionTerm
Namespace Prefix:	nucl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of extensions under the mineral rights agreement.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsAgreementNumberOfExtensions
Namespace Prefix:	nucl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of expenses incurred for the mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsExpenditureIncurred
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of consideration for repurchase of full of the net smelter return royalty

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsFullRepurchaseConsiderationForRepurchaseOfNetSmelterRevenue
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of consideration for repurchase of half of the net smelter return royalty

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsHalfRepurchaseConsiderationForRepurchaseOfNetSmelterRevenue
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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:	nucl_MineralRightsLineItems
Namespace Prefix:	nucl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of net smelter return royalty payable, under the mining rights transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsNetSmelterReturnsRoyaltyPercentage
Namespace Prefix:	nucl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of consideration payments to be made for the mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsPaymentsForExtension
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of ownership interests in the mineral rights property acquired during the period.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsPercentageOfInterestsInPropertyAcquired
Namespace Prefix:	nucl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expenses incurred as reimbursements made to the party for the mineral rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsReimbursementForExpenditureAmount
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Value of shares issued adjusted for the increase in the spot price for the mineral rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsSharesTransferredAdjustedValue
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase in value of shares issued for the mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsSharesTransferredIncreaseInValue
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of threshold consecutive trading days prior to announcement of mineral resource update considered in the determination of volume-weighted average trading price for issuance of common shares for mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsSharesTransferredThresholdConsecutiveTradingDaysPriorToMineralResourceUpdate
Namespace Prefix:	nucl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of threshold consecutive trading days prior to announcement of pre-feasibility study considered in the determination of volume-weighted average trading price for issuance of common shares for mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsSharesTransferredThresholdConsecutiveTradingDaysPriorToPreFeasibilityStudy
Namespace Prefix:	nucl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of threshold trading days based on which the volume-weighted average trading price is determined for issuance of common shares for mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsSharesTransferredThresholdTradingDays
Namespace Prefix:	nucl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The value of shares issued for the mining rights acquired in the transaction.

+ References

No definition available.

+ Details

Name:	nucl_MineralRightsSharesTransferredValue
Namespace Prefix:	nucl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of increase in spot price.

+ References

No definition available.

+ Details

Name:	nucl_PercentageOfIncreaseInSpotPrice
Namespace Prefix:	nucl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the threshold number of days deadline for the grant of net smelter return (NSR) after the closing of de-SPAC transaction.

+ References

No definition available.

+ Details

Name:	nucl_ThresholdNumberOfDaysForGrantOfNetSmelterReturn
Namespace Prefix:	nucl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying amount at the balance sheet date of mineral rights, or rights to extract a mineral from the earth or to receive payment in the form of a royalty for the extraction of minerals, net of amortization.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_PaymentsToAcquireMineralRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AssetAcquisitionAxis=nucl_OregonEnergyLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nucl_AuroraUraniumProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=nucl_MineralRightsFirstExtensionTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=nucl_MineralRightsSecondExtensionTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=nucl_MineralResourceOfAtLeast40MillionPoundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=nucl_MineralResourceForAdditionalOneMillionPoundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=nucl_EagleEnergyMetalsCorpMember
Namespace Prefix:
Data Type:	na
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MINERAL RIGHTS - Aurora Uranium Project (Details)							3 Months Ended
MINERAL RIGHTS - Aurora Uranium Project (Details)	Feb. 24, 2026 USD ($) $ / shares shares	Nov. 26, 2025	Nov. 18, 2025 USD ($)	May 18, 2025 USD ($)	Dec. 18, 2024 USD ($)	Nov. 18, 2024 USD ($) D item lb	Feb. 28, 2026 USD ($)	Feb. 28, 2025 USD ($)
MINERAL RIGHTS
Cash paid as consideration							$ 18,155	$ 300,000
Oregon Energy LLC
MINERAL RIGHTS
Percentage of interest acquired						100.00%
Number of common shares issued for acquisition of Oregon Energy \| shares	1,710,991
Mineral rights	$ 12,755,725
Aurora Uranium Project
MINERAL RIGHTS
Percentage of interests acquired						100.00%
Cash paid as consideration					$ 300,000
Value of common shares issued						$ 16,000,000
Minimum amount raised in connection with Listing Event						$ 6,800,000
NSR Royalty, percentage						1.00%
Consideration for half repurchase of NSR						$ 1,000,000
Consideration for full repurchase of NSR						$ 2,000,000
Number of extensions \| item						2
Extension term						6 months
Number of days deadline for the grant of net smelter return (NSR)	10 days
Adjusted value of shares	$ 17,109,910
Percentage increase in the spot price						50.00%
Increase in value of common shares issued						$ 5,000,000
Trading days						30 days
Threshold consecutive trading days prior to announcement of mineral resource update \| D						30
Threshold consecutive trading days prior to announcement of pre-feasibility study \| D						30
Deemed transaction price per share \| $ / shares	$ 10
Aurora Uranium Project \| First Six-Month Extension
MINERAL RIGHTS
Payments for extension						$ 300,000
Expenditure incurred						250,000
Aurora Uranium Project \| Second Six-Month Extension
MINERAL RIGHTS
Extension term		225 days
Payments for extension						400,000
Expenditure incurred						250,000
Aurora Uranium Project \| Mineral Resource of At Least 40 Million Pounds
MINERAL RIGHTS
Value of common shares issued						$ 4,000,000
Minimum volume of mineral resource \| lb						40,000,000
Aurora Uranium Project \| Mineral Resource for Additional 1,000,000 Pound
MINERAL RIGHTS
Additional volume of mineral resource \| lb						1,000,000
Increase in value of common shares issued						$ 200,000
Aurora Uranium Project \| Mineral Resource for Additional 1,000,000 Pound \| Maximum
MINERAL RIGHTS
Value of common shares issued						5,000,000
Increase in value of common shares issued						$ 1,000,000
Aurora Uranium Project \| Oregon Energy LLC
MINERAL RIGHTS
Number of common shares issued for acquisition of Oregon Energy \| shares	1,710,991
Mineral rights	$ 12,755,725
Eagle Energy
MINERAL RIGHTS
Reimbursement for expenses	$ 219,545
Eagle Energy \| Aurora Uranium Project \| Maximum
MINERAL RIGHTS
Expenditure incurred			$ 500,000
Eagle Energy \| Aurora Uranium Project \| First Six-Month Extension
MINERAL RIGHTS
Extension term				6 months
Payments for extension				$ 300,000
Eagle Energy \| Aurora Uranium Project \| Second Six-Month Extension
MINERAL RIGHTS
Extension term			6 months
Payments for extension			$ 400,000