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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basic and diluted net income per ordinary share (Details) - USD ($)
 3 Months Ended 4 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2026
Class A ordinary shares        
Numerator:        
Allocation of net income $ 1,622,540 $ 415,147 $ 336,523 $ 3,373,716
Denominator:        
Weighted-average shares outstanding 23,660,000 8,241,124 5,642,000 23,660,000
Basic net income per ordinary share $ 0.07 $ 0.05 $ 0.06 $ 0.14
Numerator:        
Allocation of net income $ 1,622,540 $ 400,645 $ 320,186 $ 3,373,716
Denominator:        
Weighted-average shares outstanding 23,660,000 8,241,124 5,642,000 23,660,000
Diluted net income per ordinary share $ 0.07 $ 0.05 $ 0.06 $ 0.14
Class B ordinary shares        
Numerator:        
Allocation of net income $ 394,320 $ 265,036 $ 297,428 $ 819,902
Denominator:        
Weighted-average shares outstanding 5,750,000 5,261,236 4,986,538 5,750,000
Basic net income per ordinary share $ 0.07 $ 0.05 $ 0.06 $ 0.14
Numerator:        
Allocation of net income $ 394,320 $ 279,538 $ 313,765 $ 819,902
Denominator:        
Weighted-average shares outstanding 5,750,000 5,750,000 5,528,846 5,750,000
Diluted net income per ordinary share $ 0.07 $ 0.05 $ 0.06 $ 0.14