Subsidiaries (Details)
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12 Months Ended |
Aug. 29, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2024 |
| 9474-9454 Quebec Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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9474-9454 Québec Inc.
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| Country of incorporation |
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Canada
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| Principal activity |
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Exploration
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| Ownership interest |
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100.00%
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100.00%
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100.00%
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| Lasec Exploration Canada Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Lasec Exploration Canada Inc.
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| Country of incorporation |
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Canada
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| Principal activity |
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Exploration
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| North American Lithium Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
[1] |
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North American Lithium Inc.
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| Country of incorporation |
[1] |
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Canada
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| Principal activity |
[1] |
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Lithium mining and processing
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| Ownership interest |
[1] |
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100.00%
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75.00%
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75.00%
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| Piedmont Lithium Carolinas, Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Carolinas, Inc.
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| Country of incorporation |
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United States
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| Principal activity |
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Sales, marketing and distribution
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium Cayman Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Cayman Inc.
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| Country of incorporation |
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United Kingdom
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| Principal activity |
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Holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium Finland Holdings, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Finland Holdings, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Investment holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium Ghana Holdings, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Ghana Holdings, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Inc.
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| Country of incorporation |
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United States
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| Principal activity |
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Administrative, management and support services
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium International Canada BC ULC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium International Canada BC ULC
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| Country of incorporation |
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Canada
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| Principal activity |
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Administrative, management and support services
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium International US, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium International US, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Sales, marketing and distribution
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium Newfoundland Holdings, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Newfoundland Holdings, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Piedmont Lithium Quebec Holdings Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Québec Holdings Inc.
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| Country of incorporation |
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United States
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| Principal activity |
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Investment holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Non-controlling ownership interest |
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25.00%
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| Piedmont Lithium Pty Ltd [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Piedmont Lithium Pty Ltd
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| Country of incorporation |
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Australia
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| Principal activity |
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Holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| PLNC Holdings, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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PLNC Holdings, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Administrative, management and support services
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| PLNC Land, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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PLNC Land, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Investment holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| PLTN Holdings, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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PLTN Holdings, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Administrative, management and support services
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| PLTN Land, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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PLTN Land, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Investment holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| PLTN Real Estate, LLC [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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PLTN Real Estate, LLC
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| Country of incorporation |
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United States
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| Principal activity |
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Holding company
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| Ownership interest |
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100.00%
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0.00%
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0.00%
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| Sayona East Kimberley Pty Ltd [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Sayona East Kimberley Pty Ltd
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| Country of incorporation |
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Australia
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| Principal activity |
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Exploration
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| Ownership interest |
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100.00%
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100.00%
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100.00%
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| Sayona Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Sayona Inc.
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| Country of incorporation |
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Canada
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| Principal activity |
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Administrative, management and support services
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| Ownership interest |
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100.00%
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100.00%
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100.00%
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| Sayona International Pty Ltd [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Sayona International Pty Ltd
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| Country of incorporation |
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Australia
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| Principal activity |
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Investment holding company
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| Ownership interest |
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100.00%
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100.00%
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100.00%
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| Sayona Lithium Pty Ltd [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Sayona Lithium Pty Ltd
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| Country of incorporation |
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Australia
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| Principal activity |
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Exploration
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| Ownership interest |
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100.00%
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100.00%
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100.00%
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| Sayona North Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
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Sayona North Inc.
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| Country of incorporation |
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Canada
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| Principal activity |
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Exploration
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| Ownership interest |
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100.00%
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100.00%
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100.00%
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| Sayona Quebec Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
[1] |
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Sayona Québec Inc.
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| Country of incorporation |
[1] |
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Canada
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| Principal activity |
[1] |
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Investment holding company
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| Ownership interest |
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75.00%
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100.00%
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[1] |
75.00%
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[1] |
75.00%
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[1] |
| Non-controlling ownership interest |
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25.00%
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| Shock MergeCo Inc. [Member] |
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| List of subsidiary companies [Abstract] |
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| Subsidiaries |
[2] |
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Shock MergeCo Inc.
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| Country of incorporation |
[2] |
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United States
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| Principal activity |
[2] |
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Investment holding company
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| Ownership interest |
[2] |
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0.00%
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100.00%
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0.00%
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