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Commitments and Contingencies (Details) - USD ($)		3 Months Ended	10 Months Ended
	May 30, 2025	Mar. 31, 2026	Dec. 31, 2025
Commitments and Contingencies [Line Items]
Underwriting discount per share (in Dollars per share)		$ 0.3
Underwriting advisory fee rate		3.00%
Advisory fee payable		$ 6,900,000	$ 6,900,000
Underwriting commission paid		250,000
Legal Fees		$ 211,390	$ 0
Over Allotment Option [Member]
Commitments and Contingencies [Line Items]
Underwriting option period		45 days
Number of additional units purchased (in Shares)	3,000,000
Underwriting discount		$ 6,900,000
Initial Public Offering [Member]
Commitments and Contingencies [Line Items]
Number of additional units purchased (in Shares)		3,000,000

X

- Definition

Represent the number of additional units issued during period shares new issues.

+ References

No definition available.

+ Details

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Namespace Prefix:	jena_
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Balance Type:	na
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X

- Definition

Represent the amount of advisory fee payable.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of underwriting agreement to an advisory fee to gross proceeds in Public Offering upon and subject to the closing of the initial Business Combination.

+ References

No definition available.

+ Details

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X

- Definition

Amounts paid or payable to underwriters, brokers, or agents for services related to the issuance and sale of securities, including underwriting commissions and fees associated with public or private offerings.

+ References

No definition available.

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X

- Definition

The amount of underwriting discount.

+ References

No definition available.

+ Details

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Namespace Prefix:	jena_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The per share amount of underwriting discount.

+ References

No definition available.

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X

- Definition

Threshold period for option to purchase additional Units to cover over-allotments.

+ References

No definition available.

+ Details

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X

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (k)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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- 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.

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- Details

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