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3. REVISIONS TO PREVIOUSLY ISSUED FINANCIAL STATEMENTS - A summary of the corrections to the impacted financial statement line items from previously issued financial statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Statement of Financial Position [Abstract]        
Deferred income taxes $ 5,761 $ 2,416    
Total Liabilities 201,821 85,910    
Accumulated deficit (479,218) (334,202)    
Total stockholders' equity 1,760,841 675,668 $ 404,012 $ 305,716
Statement of Comprehensive Income [Abstract]        
Income tax expense 3,344 2,416 0  
Loss from continuing operations (145,777) (133,719) (40,089)  
Net loss (145,777) (138,148) (57,326)  
Net loss attributable to common shareholders (149,199) (138,148) (57,662)  
Total comprehensive loss attributable to common shareholders (149,007) $ (138,032) (57,547)  
Earnings Per Share Basic   $ (1.3)    
Earnings Per Share Diluted   $ (1.3)    
Statement of Cash Flows [Abstract]        
Net Income (Loss) (145,777) $ (138,148) (57,326)  
Increase in accounts payable and accrued liabilities 19,721 13,244 16,040  
(Increase) decrease in prepaid expenses and other current assets   2,555 (1,046)  
Deferred income taxes 3,344 2,416 0  
Net cash (used in) provided by operating activities of continuing operations (233,154) (18,573) 79,820  
Net cash (used in) provided by operating activities (233,662) (17,247) 73,458  
Payments of taxes on shares withheld for net settlement of restricted stock units (5,571) (5,571)    
Proceeds from equity offerings, net   376,200 123,034  
NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 1,249,123 357,928 139,946  
Net cash provided by financing activities $ 1,249,123 357,928 139,946  
Restatement Adjustment [Member]        
Statement of Cash Flows [Abstract]        
(Increase) decrease in prepaid expenses and other current assets   7,576 2,014  
Scenario Previously Reported [Member]        
Statement of Financial Position [Abstract]        
Deferred income taxes   857    
Total Liabilities   84,351    
Accumulated deficit   (332,643)    
Total stockholders' equity   677,227    
Statement of Comprehensive Income [Abstract]        
Income tax expense   857    
Loss from continuing operations   (132,160)    
Net loss   (136,589)    
Net loss attributable to common shareholders   (136,589)    
Total comprehensive loss attributable to common shareholders   $ (136,473)    
Earnings Per Share Basic   $ (1.29)    
Earnings Per Share Diluted   $ (1.29)    
Statement of Cash Flows [Abstract]        
Net Income (Loss)   $ (136,589)    
Increase in accounts payable and accrued liabilities   7,673    
(Increase) decrease in prepaid expenses and other current assets   (5,021) (3,060)  
Deferred income taxes   857    
Net cash (used in) provided by operating activities of continuing operations   (31,720) 77,806  
Net cash (used in) provided by operating activities   (30,394) 71,444  
Payments of taxes on shares withheld for net settlement of restricted stock units      
Proceeds from equity offerings, net   383,776 125,048  
NetCashProvidedByUsedInFinancingActivitiesContinuingOperations   371,075 141,960  
Net cash provided by financing activities   $ 371,075 $ 141,960