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Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Balance, Beginning of period at Sep. 30, 2009 $ 1,745,485,000 $ 129,320,000 $ 1,574,555,000 $ 196,164,000 $ 54,431,000 $ (208,985,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 118,653,000     118,653,000    
Other comprehensive income adjustment, net of tax of $-2,760, $20,979, $-42,115: (4,749,000)       (4,749,000)  
Dividends paid on common stock (22,450,000)     (22,450,000)    
Compensation expense related to common stock 1,213,000   1,213,000      
Proceeds from excercise of common stock options 1,759,000 145,000 1,614,000      
Tax benefit related to exercise of common stock options 181,000   181,000      
Restricted stock 1,055,000 91,000 964,000      
Treasury stock 0          
Balance, End of period at Sep. 30, 2010 1,841,147,000 129,556,000 1,578,527,000 292,367,000 49,682,000 (208,985,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 111,141,000     111,141,000    
Other comprehensive income adjustment, net of tax of $-2,760, $20,979, $-42,115: 36,107,000       36,107,000  
Dividends paid on common stock (26,796,000)     (26,796,000)    
Compensation expense related to common stock 1,087,000   1,087,000      
Proceeds from excercise of common stock options 1,631,000 104,000 1,527,000      
Tax benefit related to exercise of common stock options 55,000   55,000      
Restricted stock 1,841,000 194,000 1,647,000      
Treasury stock (59,680,000)         (59,680,000)
Balance, End of period at Sep. 30, 2011 1,906,533,000 129,854,000 1,582,843,000 376,712,000 85,789,000 (268,665,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 138,183,000     138,183,000    
Other comprehensive income adjustment, net of tax of $-2,760, $20,979, $-42,115: (72,483,000)       (72,483,000)  
Dividends paid on common stock (34,115,000)     (34,115,000)    
Compensation expense related to common stock 848,000   848,000      
Proceeds from excercise of common stock options 357,000 29,000 328,000      
Tax benefit related to exercise of common stock options 0   0      
Restricted stock 2,343,000 67,000 2,276,000      
Treasury stock (41,914,000)         (41,914,000)
Balance, End of period at Sep. 30, 2012 $ 1,899,752,000 $ 129,950,000 $ 1,586,295,000 $ 480,780,000 $ 13,306,000 $ (310,579,000)