Subsequent Events	12 Months Ended
Jun. 30, 2026
Subsequent Events [Abstract]
Subsequent Events	Note 17 – Subsequent Events EP 117, 98 and 76 Permit Applications A variation application was submitted to DME in September 2025 to vary the minimum work program for years 3, 4 and 5. On July 3, 2026 the DME approved variations to the minimum work program commitments of EP 98 for years 3, 4 and 5 and EP 117 for years 3 and 4. The DME did not approve variations to years 4 and 5 for EP 76. Beetaloo JOA Letter Agreement On July 8, 2026, the Company and DWE entered into a letter agreement establishing interim funding and voting arrangements under the Beetaloo JOA, pending the grant of the retention licences and the interest realignment contemplated by the JVSA Addendum and the Checkerboard Strategy. During this interim period, the Group and DWE will each fund, and be deemed entitled to vote, an agreed percentage of the obligations and rights attributable to each area, without amending their respective equity interests in TB1 or the voting thresholds under the TB1 JVSA, and the arrangements terminate upon the grant of the last of the retention licenses (subject to earlier termination rights held by DWE over the BCDA and South FSDA areas). Acquisition of Redeemable Noncontrolling Interest On July 23, 2026, the Company completed the acquisition of FOGA minority stock held by sophisticated investors in exchange of 60,259 shares of Tamboran common stock. EP 136 Permit Application A renewal application for EP 136 was submitted to the Department of Mining and Energy (“DME”) in November 2025, requesting an extension of the permit for a period of 18 months to January 2031. On July 28, 2026 the request for this extension was not granted but the DME did grant changes to the program which varied the work program conditions for years 2 through 5, suspended the work program conditions of year 2 for a period of twelve (12) months from July 23, 2026 to July 23, 2027 and extended the term of the EP for a period of twelve (12) months from July 23, 2029 to July 23, 2030. These changes were effective as of July 23, 2026. Stamp Duty Payments On July 23, 2026, the Company lodged the stamp duty assessment for the Falcon Acquisition with the NT Government and subsequently paid the stamp duty on July 28, 2026 (Refer to Note 7). In September 2026, the stamp duty assessed for the Checkerboard Sale and Purchase Deeds (Refer to Note 7) was paid to the NT Government. Commencement of Natural Gas Production & SPCF Commissioning SPP achieved practical completion on July 17, 2026. On August 26, 2026, Tamboran commenced the commissioning of the SPCF with gas backflowed from the SPP. In early September 2026, Tamboran commenced initial gas sales from the Group's Shenandoah South 2 pad. The Group’s exploration and evaluation projects remain pending the determination of economically recoverable proven and probable reserves for the fiscal year ended June 30, 2026 and through the date this report is available for issuance. The Group has evaluated its subsequent events occurring after June 30, 2026, through September 25, 2026, which represents the date the audited financial statements were available to be issued. No further material subsequent events have been identified that would require disclosure in these audited financial statements.

A variation application was submitted to DME in September 2025 to vary the minimum work program for years 3, 4 and 5. On July 3, 2026 the DME approved variations to the minimum work program commitments of EP 98 for years 3, 4 and 5 and EP 117 for years 3 and 4. The DME did not approve variations to years 4 and 5 for EP 76.

On July 8, 2026, the Company and DWE entered into a letter agreement establishing interim funding and voting arrangements under the Beetaloo JOA, pending the grant of the retention licences and the interest realignment contemplated by the JVSA Addendum and the Checkerboard Strategy. During this interim period, the Group and DWE will each fund, and be deemed entitled to vote, an agreed percentage of the obligations and rights attributable to each area, without amending their respective equity interests in TB1 or the voting thresholds under the TB1 JVSA, and the arrangements terminate upon the grant of the last of the retention licenses (subject to earlier termination rights held by DWE over the BCDA and South FSDA areas).

On July 23, 2026, the Company completed the acquisition of FOGA minority stock held by sophisticated investors in exchange of 60,259 shares of Tamboran common stock.

A renewal application for EP 136 was submitted to the Department of Mining and Energy (“DME”) in November 2025, requesting an extension of the permit for a period of 18 months to January 2031. On July 28, 2026 the request for this extension was not granted but the DME did grant changes to the program which varied the work program conditions for years 2 through 5, suspended the work program conditions of year 2 for a period of twelve (12) months from July 23, 2026 to July 23, 2027 and extended the term of the EP for a period of twelve (12) months from July 23, 2029 to July 23, 2030. These changes were effective as of July 23, 2026.

On July 23, 2026, the Company lodged the stamp duty assessment for the Falcon Acquisition with the NT Government and subsequently paid the stamp duty on July 28, 2026 (Refer to Note 7).

SPP achieved practical completion on July 17, 2026. On August 26, 2026, Tamboran commenced the commissioning of the SPCF with gas backflowed from the SPP. In early September 2026, Tamboran commenced initial gas sales from the Group's Shenandoah South 2 pad. The Group’s exploration and evaluation projects remain pending the determination of economically recoverable proven and probable reserves for the fiscal year ended June 30, 2026 and through the date this report is available for issuance.

The Group has evaluated its subsequent events occurring after June 30, 2026, through September 25, 2026, which represents the date the audited financial statements were available to be issued. No further material subsequent events have been identified that would require disclosure in these audited financial statements.