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Consolidated Statements of Shareholders' Equity (Unaudited) - 9 months ended Jun. 30, 2018 - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Sep. 30, 2017 19,041        
Balance at Sep. 30, 2017 $ 19,041 $ 69,817 $ 135,851 $ (1,333) $ 223,376
Net earnings     26,858   26,858
Stock options exercised, net (in shares) 24        
Stock options exercised, net $ 24 218     242
Vesting of restricted stock units (in shares) 20        
Vesting of restricted stock units $ 20 (20)    
Compensation expense associated with stock-based plans   1,241     1,241
Restricted stock units and stock options surrendered for withholding taxes payable   (274)     (274)
Cash dividends declared     (20,756)   (20,756)
Balance (in shares) at Jun. 30, 2018 19,085        
Balance at Jun. 30, 2018 $ 19,085 $ 70,982 $ 141,953 $ (1,333) $ 230,687