CONDENSED CONSOLIDATED INTERIM STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical)	3 Months Ended	9 Months Ended
Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2026	Aug. 31, 2025
Common stock, not subject to possible redemption
Exchange ratio	5.8349	5.8349	5.8349	5.8349

Exchange ratio for issuance of shares under reverse recapitalization.

No definition available.

Name:	nucl_ReverseRecapitalizationExchangeRatio
Namespace Prefix:	nucl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration