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Credit Arrangements (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Jun. 19, 2013
$200 million notes at 5.625% due November 2013 [Member]
May 31, 2013
CMCP [Member]
May 31, 2013
Revolving Credit Facility [Member]
May 31, 2013
Letter of Credit [Member]
May 31, 2013
$330 million notes at 4.875% due May 2023 [Member]
May 31, 2013
Change of control triggering event
May 31, 2013
$200 million notes at 5.625% due November 2013 [Member]
May 31, 2013
$200 million notes at 5.625% due November 2013 [Member]
May 20, 2013
$200 million notes at 5.625% due November 2013 [Member]
May 06, 2013
$200 million notes at 5.625% due November 2013 [Member]
Aug. 31, 2012
$200 million notes at 5.625% due November 2013 [Member]
Debt Instrument [Line Items]                              
Debt instrument, face amount                 $ 330,000,000   $ 200,000,000 $ 200,000,000     $ 200,000,000
Debt instrument, interest rate, stated percentage                 4.875%   5.625% 5.625%     5.625%
Debt Instrument, Maturity Date                 May 15, 2023            
Proceeds from issuance of debt, net of underwriting discounts and debt issuance costs                 325,000,000            
Redemption purchase price to principal amount, percentage                 100.00% 101.00%     100.00% 102.45%  
Repayments of Long-term Debt     63,442,000 63,542,000 140,000,000           60,000,000        
Losses on Extinguishment of Debt     1,502,000 0 3,100,000           1,500,000 1,502,000      
Outstanding principal balance of debt                         140,000,000    
Line of credit facility, current borrowing capacity           73,400,000 300,000,000 50,000,000              
Revolving credit facility, maturity date             Dec. 27, 2016                
Revolving credit facility, maximum borrowing capacity             400,000,000                
Stand by letters of credit outstanding amount               31,900,000              
Minimum interest coverage ratio             300.00%                
Actual interest coverage ratio             557.00%                
Maximum debt to capitalization ratio             60.00%                
Actual debt to capitalization ratio             55.00%                
Net proceeds from termination of interest rate swaps   53,000,000 0 52,733,000                      
Deferred gain on termination of interest rate swaps 38,200,000   38,200,000                        
Amortization of interest rate swaps termination gain 2,900,000   8,723,000 2,908,000                      
Line of credit facility, amount outstanding           0                  
Short-term debt weighted average interest rate           4.57%                  
Interest paid $ 7,500,000 $ 5,200,000 $ 45,800,000 $ 39,800,000