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Condensed Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock Outstanding [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Treasury Stock [Member]
Balance (in shares) at Jun. 30, 2023   27,528,000      
Balance at Jun. 30, 2023 $ 862,267 $ 143,870 $ 1,503,963 $ (9,365) $ (776,201)
Net income 43,951   43,951    
Net pension and postretirement benefit gains (losses), net of tax effect 76     76  
Cash dividends - common stock (23,445)   (23,445)    
Purchase of treasury stock (in shares)   (40,000)      
Purchase of treasury stock (6,650)       (6,650)
Stock-based plans (in shares)   29,000      
Stock-based plans 0 $ 0      
Stock-based compensation expense 2,569 $ 2,569      
Balance (in shares) at Sep. 30, 2023   27,517,000      
Balance at Sep. 30, 2023 878,768 $ 146,439 1,524,469 (9,289) (782,851)
Balance (in shares) at Jun. 30, 2023   27,528,000      
Balance at Jun. 30, 2023 862,267 $ 143,870 1,503,963 (9,365) (776,201)
Net income 123,785        
Net pension and postretirement benefit gains (losses), net of tax effect 226        
Balance (in shares) at Mar. 31, 2024   27,527,000      
Balance at Mar. 31, 2024 912,852 $ 151,178 1,554,635 (9,139) (783,822)
Balance (in shares) at Sep. 30, 2023   27,517,000      
Balance at Sep. 30, 2023 878,768 $ 146,439 1,524,469 (9,289) (782,851)
Net income 51,484   51,484    
Net pension and postretirement benefit gains (losses), net of tax effect 75     75  
Cash dividends - common stock (24,810)   (24,810)    
Purchase of treasury stock (in shares)   0      
Purchase of treasury stock (42)       (42)
Stock-based plans (in shares)   4,000      
Stock-based plans (3) $ (3)      
Stock-based compensation expense 2,854 $ 2,854      
Balance (in shares) at Dec. 31, 2023   27,521,000      
Balance at Dec. 31, 2023 908,326 $ 149,290 1,551,143 (9,214) (782,893)
Net income 28,350   28,350    
Net pension and postretirement benefit gains (losses), net of tax effect 75     75  
Cash dividends - common stock (24,858)   (24,858)    
Purchase of treasury stock (in shares)   (5,000)      
Purchase of treasury stock (929)       (929)
Stock-based plans (in shares)   11,000      
Stock-based plans (1,610) $ (1,610)      
Stock-based compensation expense 3,498 $ 3,498      
Balance (in shares) at Mar. 31, 2024   27,527,000      
Balance at Mar. 31, 2024 $ 912,852 $ 151,178 1,554,635 (9,139) (783,822)
Balance (in shares) at Jun. 30, 2024 27,527,090 27,527,000      
Balance at Jun. 30, 2024 $ 925,772 $ 153,616 1,564,642 (8,640) (783,846)
Net income 44,701   44,701    
Net pension and postretirement benefit gains (losses), net of tax effect 67     67  
Cash dividends - common stock (24,866)   (24,866)    
Purchase of treasury stock (in shares)   (7,000)      
Purchase of treasury stock (1,440)       (1,440)
Stock-based plans (in shares)   46,000      
Stock-based plans (1,551) $ (1,551)      
Stock-based compensation expense 2,369 $ 2,369      
Balance (in shares) at Sep. 30, 2024   27,566,000      
Balance at Sep. 30, 2024 $ 945,052 $ 154,434 1,584,477 (8,573) (785,286)
Balance (in shares) at Jun. 30, 2024 27,527,090 27,527,000      
Balance at Jun. 30, 2024 $ 925,772 $ 153,616 1,564,642 (8,640) (783,846)
Net income 134,818        
Net pension and postretirement benefit gains (losses), net of tax effect $ 9,604        
Balance (in shares) at Mar. 31, 2025 27,569,107 27,569,000      
Balance at Mar. 31, 2025 $ 996,248 $ 158,494 1,622,155 964 (785,365)
Balance (in shares) at Sep. 30, 2024   27,566,000      
Balance at Sep. 30, 2024 945,052 $ 154,434 1,584,477 (8,573) (785,286)
Net income 48,993   48,993    
Pension settlement charge, net of tax effect 10,704     10,704  
Other net pension and postretirement benefit losses, net of tax effect (1,121)     (1,121)  
Cash dividends - common stock (26,259)   (26,259)    
Purchase of treasury stock (in shares)   0      
Purchase of treasury stock (3)       (3)
Stock-based plans (in shares)   6,000      
Stock-based plans (46) $ (46)      
Stock-based compensation expense 2,546 $ 2,546      
Balance (in shares) at Dec. 31, 2024   27,572,000      
Balance at Dec. 31, 2024 979,866 $ 156,934 1,607,211 1,010 (785,289)
Net income 41,124   41,124    
Net pension and postretirement benefit gains (losses), net of tax effect (46)     (46)  
Cash dividends - common stock (26,180)   (26,180)    
Purchase of treasury stock (in shares)   (1,000)      
Purchase of treasury stock (76)       (76)
Stock-based plans (in shares)   (2,000)      
Stock-based plans 0 $ 0      
Stock-based compensation expense $ 1,560 $ 1,560      
Balance (in shares) at Mar. 31, 2025 27,569,107 27,569,000      
Balance at Mar. 31, 2025 $ 996,248 $ 158,494 $ 1,622,155 $ 964 $ (785,365)