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Segment Information (Tables)
 12 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment In addition, research and development and selling, general and administrative expenses are significant segment expenses regularly provided to the CEO with the following categories:
Research and Development
Year Ended September 30,
202520242023
(in thousands)
Candidate costs$347,571 $259,280 $162,459 
R&D discovery costs66,788 74,150 55,586 
Salaries109,085 96,418 73,668 
Facilities related29,233 25,782 16,267 
Total research and development expense, excluding non-cash expense$552,677 $455,630 $307,980 
Stock compensation32,582 33,586 34,332 
Depreciation and amortization21,900 16,654 10,876 
Total research and development expense$607,159 $505,870 $353,188 

General & Administrative
Year Ended September 30,
202520242023
(in thousands)
Salaries$31,916 $27,589 $22,999 
Professional, outside services, and other53,589 24,733 20,720 
Facilities related5,625 4,116 3,415 
Total general and administrative expense, excluding non-cash expense$91,130 $56,438 $47,134 
Stock compensation30,785 40,382 43,798 
Depreciation/amortization2,028 1,941 1,617 
Total general and administrative expense$123,943 $98,761 $92,549