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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Beginning balance (in shares) at Sep. 30, 2022   30,880    
Beginning balance at Sep. 30, 2022 $ 939,286 $ 31 $ 859,856 $ 79,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 102,855     102,855
Stock-based compensation expense 5,247   5,247  
Stock option exercises (in shares)   2    
Stock option exercises 12   12  
Shares issued under employee stock plans, net (in shares)   675    
Forfeiture and other settlements of restricted stock (in shares)   (12)    
Common stock redeemed for tax liability (in shares)   (206)    
Common stock redeemed for tax liability (2,615)   (2,615)  
Ending balance (in shares) at Jun. 30, 2023   31,339    
Ending balance at Jun. 30, 2023 1,044,785 $ 31 862,500 182,254
Beginning balance (in shares) at Mar. 31, 2023   31,347    
Beginning balance at Mar. 31, 2023 998,985 $ 31 860,517 138,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 43,817     43,817
Stock-based compensation expense 1,989   1,989  
Stock option exercises (in shares)   2    
Stock option exercises 12   12  
Forfeiture and other settlements of restricted stock (in shares)   (9)    
Common stock redeemed for tax liability (in shares)   (1)    
Common stock redeemed for tax liability (18)   (18)  
Ending balance (in shares) at Jun. 30, 2023   31,339    
Ending balance at Jun. 30, 2023 1,044,785 $ 31 862,500 182,254
Beginning balance (in shares) at Sep. 30, 2023   31,351    
Beginning balance at Sep. 30, 2023 1,102,819 $ 31 864,778 238,010
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 88,109     88,109
Stock-based compensation expense 5,536   5,536  
Stock option exercises (in shares)   2    
Stock option exercises 16   16  
Shares issued under employee stock plans, net (in shares)   383    
Shares issued under employee stock plans, net 1 $ 1    
Forfeiture and other settlements of restricted stock (in shares)   (26)    
Common stock redeemed for tax liability (in shares)   (173)    
Common stock redeemed for tax liability $ (5,237)   (5,237)  
Share repurchases (in shares) (455) (455)    
Share repurchases $ (12,929) $ (1) (12,928)  
Ending balance (in shares) at Jun. 30, 2024   31,082    
Ending balance at Jun. 30, 2024 1,178,315 $ 31 852,165 326,119
Beginning balance (in shares) at Mar. 31, 2024   31,547    
Beginning balance at Mar. 31, 2024 1,161,577 $ 32 862,636 298,909
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income 27,210     27,210
Stock-based compensation expense 2,474   2,474  
Shares issued under employee stock plans, net (in shares)   7    
Forfeiture and other settlements of restricted stock (in shares)   (16)    
Common stock redeemed for tax liability (in shares)   (1)    
Common stock redeemed for tax liability $ (17)   (17)  
Share repurchases (in shares) (455) (455)    
Share repurchases $ (12,929) $ (1) (12,928)  
Ending balance (in shares) at Jun. 30, 2024   31,082    
Ending balance at Jun. 30, 2024 $ 1,178,315 $ 31 $ 852,165 $ 326,119