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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Beginning balance (in shares) at Sep. 30, 2024   31,048,000    
Beginning balance at Sep. 30, 2024 $ 1,232,111 $ 31 $ 853,895 $ 378,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) and comprehensive income (loss) 15,584     15,584
Stock-based compensation expense 5,442   5,442  
Stock option exercises (in shares)   11,000    
Stock option exercises 107   107  
Shares issued under employee stock plans, net (in shares)   286,000    
Forfeiture and other settlements of restricted stock (in shares)   (32,000)    
Common stock redeemed for tax liability (in shares)   (96,000)    
Common stock redeemed for tax liability $ (3,136)   (3,136)  
Share repurchases (in shares) (1,500,000) (1,491,000)    
Share repurchases $ (33,077) $ (1) (33,076)  
Ending balance (in shares) at Jun. 30, 2025   29,726,000    
Ending balance at Jun. 30, 2025 1,217,031 $ 30 823,232 393,769
Beginning balance (in shares) at Mar. 31, 2025   30,303,000    
Beginning balance at Mar. 31, 2025 1,228,067 $ 30 833,944 394,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) and comprehensive income (loss) (324)     (324)
Stock-based compensation expense 1,817   1,817  
Stock option exercises 1   1  
Shares issued under employee stock plans, net (in shares)   12,000    
Forfeiture and other settlements of restricted stock (in shares)   (2,000)    
Common stock redeemed for tax liability (in shares)   (1,000)    
Common stock redeemed for tax liability $ (15)   (15)  
Share repurchases (in shares) (586,000) (586,000)    
Share repurchases $ (12,515)   (12,515)  
Ending balance (in shares) at Jun. 30, 2025   29,726,000    
Ending balance at Jun. 30, 2025 1,217,031 $ 30 823,232 393,769
Beginning balance (in shares) at Mar. 31, 2025   30,303,000    
Beginning balance at Mar. 31, 2025 $ 1,228,067 $ 30 833,944 394,093
Ending balance (in shares) at Jun. 30, 2026 27,330,791 27,331,000    
Ending balance at Jun. 30, 2026 $ 1,146,990 $ 27 760,918 386,045
Beginning balance (in shares) at Sep. 30, 2025 29,762,293 29,762,000    
Beginning balance at Sep. 30, 2025 $ 1,248,906 $ 30 825,103 423,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) and comprehensive income (loss) (37,728)     (37,728)
Stock-based compensation expense 5,141   5,141  
Shares issued under employee stock plans, net (in shares)   569,000    
Shares issued under employee stock plans, net   $ 1 (1)  
Forfeiture and other settlements of restricted stock (in shares)   (10,000)    
Common stock redeemed for tax liability (in shares)   (117,000)    
Common stock redeemed for tax liability $ (2,537)   (2,537)  
Share repurchases (in shares) (2,900,000) (2,873,000)    
Share repurchases $ (66,792) $ (4) (66,788)  
Ending balance (in shares) at Jun. 30, 2026 27,330,791 27,331,000    
Ending balance at Jun. 30, 2026 $ 1,146,990 $ 27 760,918 386,045
Beginning balance (in shares) at Mar. 31, 2026   28,332,000    
Beginning balance at Mar. 31, 2026 1,170,780 $ 28 780,480 390,272
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) and comprehensive income (loss) (4,227)     (4,227)
Stock-based compensation expense 1,711   1,711  
Shares issued under employee stock plans, net (in shares)   4,000    
Forfeiture and other settlements of restricted stock (in shares)   (3,000)    
Common stock redeemed for tax liability (in shares)   (2,000)    
Common stock redeemed for tax liability $ (45)   (45)  
Share repurchases (in shares) (1,000,000.0) (1,000,000)    
Share repurchases $ (21,229) $ (1) (21,228)  
Ending balance (in shares) at Jun. 30, 2026 27,330,791 27,331,000    
Ending balance at Jun. 30, 2026 $ 1,146,990 $ 27 $ 760,918 $ 386,045