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INCOME TAXES (Details) (USD $)
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Current:   
Federal$ 42,377,000$ 31,312,000$ 45,780,000
Foreign14,259,00013,215,00013,442,000
State8,112,0001,937,0008,889,000
Total current64,748,00046,464,00068,111,000
Deferred:   
Federal185,076,000100,206,000148,367,000
Foreign(4,117,000)7,846,0002,865,000
State6,692,000(2,361,000)8,507,000
Total deferred187,651,000105,691,000159,739,000
Total provision252,399,000152,155,000227,850,000
Domestic and foreign income before income taxes and equity in income of affiliate   
Domestic666,073,000389,383,000571,028,000
Foreign20,994,00048,853,00027,257,000
Income from continuing operations before income taxes and equity in income of affiliate687,067,000438,236,000598,285,000
Deferred tax liabilities:   
Property, plant and equipment898,657,000703,404,000 
Available-for-sale securities119,464,000107,917,000 
Other62,000136,000 
Total deferred tax liabilities1,018,183,000811,457,000 
Deferred tax assets:   
Pension reserves14,260,00015,549,000 
Self-insurance reserves8,344,0004,249,000 
Net operating loss and foreign tax credit carryforwards54,967,00045,343,000 
Financial accruals36,672,00031,102,000 
Other3,224,0003,456,000 
Total deferred tax assets117,467,00099,699,000 
Valuation allowance54,709,00045,343,000 
Net deferred tax assets62,758,00054,356,000 
Net deferred tax liabilities955,425,000757,101,000 
Effective income tax rates as compared to the U.S. Federal income tax rate   
U.S. Federal income tax rate (as a percent)35.00%35.00%35.00%
Effect of foreign taxes (as a percent)1.00%1.00%1.00%
State income taxes (as a percent)1.00%(1.00%)2.00%
Effective income tax rate (as a percent)37.00%35.00%38.00%
Accrued interest and penalties related to unrecognized tax benefits5,400,0003,200,000 
Reconciliation of the change in gross unrecognized tax benefits   
Unrecognized tax benefits at the beginning of the period5,549,0005,244,000 
Gross decreases - tax positions in prior periods(249,000)  
Gross increases - tax positions in prior periods2,561,000177,000 
Gross increases - current period effect of tax positions434,000128,000 
Expiration of statute of limitations for assessments(1,417,000)  
Unrecognized tax benefits at the end of the period6,878,0005,549,0005,244,000
Liability for unrecognized tax benefits which would affect the effective tax rate if recognized6,900,0005,600,000 
Operating Loss Carryforwards   
Amount of foreign tax credit carryforwards for income tax purposes44,000,000  
State and Local jurisdiction
   
Operating Loss Carryforwards   
Amount of net operating loss carryforwards for income tax purposes10,300,000  
Foreign jurisdiction
   
Operating Loss Carryforwards   
Amount of net operating loss carryforwards for income tax purposes$ 29,000,000