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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Common shareholders' equity, beginning balance at Sep. 30, 2008 $ 454$ 1,744,384$ (35,947)$ 343,601
Common stock shares outstanding, balance at Sep. 30, 2008 90,814,683   
Comprehensive income:     
Net income (loss)190,978   190,978
Unrealized holding gains (losses) on investments, net   (1,820) 
Other than temporary impairment of investments, net   3,370 
Treasury Lock Agreements Net   3,606 
Cash flow hedges, net   10,607 
Change in measurement date for employee benefit plans    (7,766)
Cash dividends    (121,460)
Common stock issued:     
Direct stock purchase plan, amount 28,743  
Direct stock purchase plan, shares 407,262   
Retirement savings plan, amount 316,571  
Retirement savings plan, shares 640,639   
1998 Long-term incentive plan, amount 48,075  
1998 Long-term incentive plan, shares 686,046   
Employee stock-based compensation  13,280  
Outside directors stock-for-fee-plan, amount  76  
Stock Issued During Period Shares Directors Stock For Fee Plan 3,079   
Common shareholders' equity, ending balance at Sep. 30, 2009 4631,791,129(20,184)405,353
Common stock shares outstanding, ending balance at Sep. 30, 2009 92,551,709   
Comprehensive income:     
Net income (loss)205,839   205,839
Unrealized holding gains (losses) on investments, net   1,745 
Treasury Lock Agreements Net   2,030 
Cash flow hedges, net(4,933)  (6,963) 
Repurchase of common stock, amount (15)(100,435)  
Repurchase of common stock, shares (2,958,580)   
Repurchase of equity awards, amount  (1,191)  
Repurchase of equity awards, shares (37,365)   
Cash dividends    (124,287)
Common stock issued:     
Direct stock purchase plan, amount 12,881  
Direct stock purchase plan, shares 103,529   
Retirement savings plan, amount  2,281  
Retirement savings plan, shares 79,722   
1998 Long-term incentive plan, amount 28,708  
1998 Long-term incentive plan, shares 421,706   
Employee stock-based compensation  10,894  
Outside directors stock-for-fee-plan, amount  97  
Stock Issued During Period Shares Directors Stock For Fee Plan 3,382   
Common shareholders' equity, ending balance at Sep. 30, 20102,178,3484511,714,364(23,372)486,905
Common stock shares outstanding, ending balance at Sep. 30, 2010 90,164,103   
Comprehensive income:     
Net income (loss)207,601   207,601
Unrealized holding gains (losses) on investments, net   (1,647) 
Treasury Lock Agreements Net   (28,689) 
Cash flow hedges, net(23,441)  5,248 
Repurchase of common stock, amount (2)2  
Repurchase of common stock, shares (375,468)   
Repurchase of equity awards, amount  (5,298)  
Repurchase of equity awards, shares (169,793)   
Cash dividends    (124,011)
Common stock issued:     
Direct stock purchase plan, amount 0(54)  
Direct stock purchase plan, shares 0   
Retirement savings plan, amount  0  
Retirement savings plan, shares 0   
1998 Long-term incentive plan, amount 313,886  
1998 Long-term incentive plan, shares 675,255   
Employee stock-based compensation  9,958  
Outside directors stock-for-fee-plan, amount  77  
Stock Issued During Period Shares Directors Stock For Fee Plan 2,385   
Common shareholders' equity, ending balance at Sep. 30, 2011$ 2,255,421$ 451$ 1,732,935$ (48,460)$ 570,495
Common stock shares outstanding, ending balance at Sep. 30, 2011 90,296,482