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Unaudited Condensed Consolidated Statements of Loss and Comprehensive Loss - USD ($)
 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Sales $ 20,843,086 $ 14,973,048
Cost of sales (18,941,243) (14,082,663)
Gross profit 1,901,843 890,385
Operating expenses:    
Selling and marketing expenses (1,010,350) (897,059)
General and administrative expenses (4,202,385) (2,900,993)
Research and development costs (1,564,969) (965,157)
Gain from disposal of property, plant and equipment 81,036
Total operating expenses (6,777,704) (4,682,173)
Operating loss (4,875,861) (3,791,788)
Other income (expenses):    
Interest expense, net (1,227,192) (1,102,464)
Other income, net 422,009 244,873
Total other expenses, net (805,183) (857,591)
Loss before income taxes (5,681,044) (4,649,379)
Income tax expense (42)
Net loss (5,681,086) (4,649,379)
Net loss attributable to non-controlling interests (501,672) (8,158)
Net loss attributable to Ostin Technology Group Co., Ltd. (5,179,414) (4,641,221)
Other comprehensive income (loss):    
Foreign currency translation adjustment 953,158 56,198
Comprehensive loss (4,727,928) (4,593,181)
Comprehensive (loss) income attributable to non-controlling interests (559,681) 60,215
Comprehensive loss attributable to Ostin Technology Group Co., Ltd. $ (4,168,247) $ (4,653,396)
Loss per share    
Basic Loss per share (in Dollars per share) [1] $ (2.98) $ (0.29)
Diluted Loss per share (in Dollars per share) [1] $ (2.98) $ (0.29)
Weighted average number of ordinary shares outstanding    
Basic Weighted average number of ordinary shares outstanding (in Shares) 1,735,977 15,844,501
Diluted Weighted average number of ordinary shares outstanding (in Shares) 1,735,977 15,844,501
[1] The financial statements give retroactive effect to the December 31, 2024 one-for-ten reverse share split.