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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock
Treasury Stock, Common
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2020 $ 371,500,000 $ 355,000 $ (55,109,000) $ 279,741,000 $ 170,330,000 $ (23,817,000)
Beginning balance (in shares) at Sep. 30, 2020   35,513,000 6,353,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 10,366,000       10,366,000  
Other comprehensive income (loss) $ 1,071,000         1,071,000
Stock Issued During Period, Value, New Issues   $ 40,000        
Stock Issued During Period, Shares, New Issues 73,830,000 4,025,000   73,790,000    
Other $ (4,000)       (4,000)  
Employee stock purchase issuances (in shares)     (79,000)      
Employee stock purchase issuances 1,214,000   $ 694,000 $ 520,000    
Taxes paid for net share settlement of share-based payment awards (in shares)     117,000      
Taxes paid for net share settlement of share-based payment awards (2,120,000)   $ (2,120,000)      
Issuance of stock under stock award plans (in shares)   1,115,000        
Issuance of stock under stock award plans 8,525,000 $ 12,000   8,513,000    
Stock-based compensation expense 8,135,000     8,135,000    
Ending balance (in shares) at Sep. 30, 2021   40,653,000 6,391,000      
Ending balance at Sep. 30, 2021 472,517,000 $ 407,000 $ (56,535,000) 370,699,000 180,692,000 (22,746,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 19,383,000       19,383,000  
Other comprehensive income (loss) $ (3,308,000)         (3,308,000)
Stock Issued During Period, Shares, New Issues 4,025,000          
Employee stock purchase issuances (in shares)     (80,000)      
Employee stock purchase issuances $ 1,500,000   $ 726,000 774,000    
Taxes paid for net share settlement of share-based payment awards (in shares)     102,000      
Taxes paid for net share settlement of share-based payment awards (6,662,000)   $ (2,363,000) (4,299,000)    
Issuance of stock under stock award plans (in shares)   1,297,000        
Issuance of stock under stock award plans 9,505,000 $ 13,000   9,492,000    
Stock-based compensation expense 8,578,000     8,578,000    
Ending balance (in shares) at Sep. 30, 2022   41,950,000 6,413,000      
Ending balance at Sep. 30, 2022 501,513,000 $ 420,000 $ (58,172,000) 385,244,000 200,075,000 (26,054,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 24,770,000       24,770,000  
Other comprehensive income (loss) (957,000)         (957,000)
Employee stock purchase issuances (in shares)     (83,000)      
Employee stock purchase issuances 2,263,000   $ 787,000 1,476,000    
Taxes paid for net share settlement of share-based payment awards (in shares)     106,000      
Taxes paid for net share settlement of share-based payment awards (4,314,000)   $ (4,121,000) (193,000)    
Issuance of stock under stock award plans (in shares)   551,000        
Issuance of stock under stock award plans 3,927,000 $ 5,000   3,922,000    
Stock-based compensation expense 13,286,000     13,286,000    
Ending balance (in shares) at Sep. 30, 2023   42,501,000 6,436,000      
Ending balance at Sep. 30, 2023 $ 540,488,000 $ 425,000 $ (61,506,000) $ 403,735,000 $ 224,845,000 $ (27,011,000)