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Debt And Capital Lease Obligations (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Jun. 08, 2011
Apr. 22, 2013
New Credit Facility [Member]
Aug. 31, 2013
New Credit Facility [Member]
Aug. 31, 2013
Revolving Credit Facility [Member]
Aug. 31, 2013
Federal Funds Effective Rate Plus [Member]
Aug. 31, 2013
LIBOR Interest Period Plus [Member]
New Credit Facility [Member]
Aug. 31, 2013
One-Month Interest Period [Member]
LIBOR Interest Period Plus [Member]
Aug. 31, 2013
Minimum [Member]
Aug. 31, 2013
Minimum [Member]
LIBOR Loans Rate Applicable Margin [Member]
New Credit Facility [Member]
Aug. 31, 2013
Maximum [Member]
Aug. 31, 2013
Maximum [Member]
LIBOR Loans Rate Applicable Margin [Member]
New Credit Facility [Member]
Aug. 31, 2013
Corporate Bond Securities [Member]
Debt Instrument [Line Items]                            
Unsecured credit facility     $ 200,000 $ 650,000                    
Unsecured revolving loan facility, Term       5 years                    
Unsecured revolving loan facility, Amount       400,000                    
Unsecured term loan facility, Term       5 years                    
Unsecured term loan facility, Amount       250,000                    
Line of credit increase         200,000                  
Maturity date       Apr. 22, 2018                    
Percentage points in addition to reference rate used in computation of variable rate on debt instrument         1.19%   0.50% 1.00% 1.00% 0.00% 1.00% 0.375% 1.375%  
Quarterly undrawn fee                   0.10%   0.20%    
Quarterly letter of credit usage fees                   1.00%   1.375%    
Quarterly fronting fee 0.125%                          
Capital leases and financing obligations for certain information technology equipment entered into 1,854 4,582                        
Maximum consolidated leverage ratio of total indebtness to EBITDA 300.00%                          
Minimum consolidted interest coverage ratio of EBITDA to total interest expense 300.00%                          
Amount of purchase price financed           370,000                
Repayment of loan facility           120,000                
Outstanding balance 0                          
Amount due under all capital leases and financing agreements 5,750                         2,000
Total borrowings outstanding         250,000                  
Less: current portion 1,684                          
Current maturities         12,500                  
Property and equipment acquired under capital leases and financing agreements 5,594                          
Amortization expense of property and equipment acquired under capital leases and financing arrangements $ 176                          
Lease term 20 years                          
Lease prepayment option without penalty period                   7 years   20 years