v3.26.3
Subsidiaries (Details)
12 Months Ended
Aug. 29, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
9474-9454 Quebec Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   9474-9454 Québec Inc.    
Country of incorporation   Canada    
Principal activity   Exploration    
Ownership interest   100.00% 100.00% 100.00%
Lasec Exploration Canada Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Lasec Exploration Canada Inc.    
Country of incorporation   Canada    
Principal activity   Exploration    
Ownership interest   100.00% 0.00% 0.00%
North American Lithium Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries [1]   North American Lithium Inc.    
Country of incorporation [1]   Canada    
Principal activity [1]   Lithium mining and processing    
Ownership interest [1]   100.00% 75.00% 75.00%
Piedmont Lithium Carolinas, Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Carolinas, Inc.    
Country of incorporation   United States    
Principal activity   Sales, marketing and distribution    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium Cayman Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Cayman Inc.    
Country of incorporation   United Kingdom    
Principal activity   Holding company    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium Finland Holdings, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Finland Holdings, LLC    
Country of incorporation   United States    
Principal activity   Investment holding company    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium Ghana Holdings, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Ghana Holdings, LLC    
Country of incorporation   United States    
Principal activity   Holding company    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Inc.    
Country of incorporation   United States    
Principal activity   Administrative, management and support services    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium International Canada BC ULC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium International Canada BC ULC    
Country of incorporation   Canada    
Principal activity   Administrative, management and support services    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium International US, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium International US, LLC    
Country of incorporation   United States    
Principal activity   Sales, marketing and distribution    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium Newfoundland Holdings, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Newfoundland Holdings, LLC    
Country of incorporation   United States    
Principal activity   Holding company    
Ownership interest   100.00% 0.00% 0.00%
Piedmont Lithium Quebec Holdings Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Québec Holdings Inc.    
Country of incorporation   United States    
Principal activity   Investment holding company    
Ownership interest   100.00% 0.00% 0.00%
Non-controlling ownership interest   25.00%    
Piedmont Lithium Pty Ltd [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Piedmont Lithium Pty Ltd    
Country of incorporation   Australia    
Principal activity   Holding company    
Ownership interest   100.00% 0.00% 0.00%
PLNC Holdings, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   PLNC Holdings, LLC    
Country of incorporation   United States    
Principal activity   Administrative, management and support services    
Ownership interest   100.00% 0.00% 0.00%
PLNC Land, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   PLNC Land, LLC    
Country of incorporation   United States    
Principal activity   Investment holding company    
Ownership interest   100.00% 0.00% 0.00%
PLTN Holdings, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   PLTN Holdings, LLC    
Country of incorporation   United States    
Principal activity   Administrative, management and support services    
Ownership interest   100.00% 0.00% 0.00%
PLTN Land, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   PLTN Land, LLC    
Country of incorporation   United States    
Principal activity   Investment holding company    
Ownership interest   100.00% 0.00% 0.00%
PLTN Real Estate, LLC [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   PLTN Real Estate, LLC    
Country of incorporation   United States    
Principal activity   Holding company    
Ownership interest   100.00% 0.00% 0.00%
Sayona East Kimberley Pty Ltd [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Sayona East Kimberley Pty Ltd    
Country of incorporation   Australia    
Principal activity   Exploration    
Ownership interest   100.00% 100.00% 100.00%
Sayona Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Sayona Inc.    
Country of incorporation   Canada    
Principal activity   Administrative, management and support services    
Ownership interest   100.00% 100.00% 100.00%
Sayona International Pty Ltd [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Sayona International Pty Ltd    
Country of incorporation   Australia    
Principal activity   Investment holding company    
Ownership interest   100.00% 100.00% 100.00%
Sayona Lithium Pty Ltd [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Sayona Lithium Pty Ltd    
Country of incorporation   Australia    
Principal activity   Exploration    
Ownership interest   100.00% 100.00% 100.00%
Sayona North Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries   Sayona North Inc.    
Country of incorporation   Canada    
Principal activity   Exploration    
Ownership interest   100.00% 100.00% 100.00%
Sayona Quebec Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries [1]   Sayona Québec Inc.    
Country of incorporation [1]   Canada    
Principal activity [1]   Investment holding company    
Ownership interest 75.00% 100.00% [1] 75.00% [1] 75.00% [1]
Non-controlling ownership interest 25.00%      
Shock MergeCo Inc. [Member]        
List of subsidiary companies [Abstract]        
Subsidiaries [2]   Shock MergeCo Inc.    
Country of incorporation [2]   United States    
Principal activity [2]   Investment holding company    
Ownership interest [2]   0.00% 100.00% 0.00%
[1] Non-controlling ownership interest of 25 per cent is held by Piedmont Lithium Québec Holdings Inc.
[2] Shock MergeCo Inc. was incorporated on 14 November 2024. On merger completion, Piedmont Lithium Inc. merged with and into Shock MergeCo Inc., resulting in Shock MergeCo Inc. being replaced by Piedmont Lithium Inc.