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Share-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Dec. 01, 2012
Dec. 01, 2012
Performance Awards [Member]
Aug. 31, 2012
Unvested Share Awards [Member]
Dec. 01, 2012
Unvested Share Awards [Member]
Dec. 01, 2012
Adjusted EBITDA [Member]
Performance Awards [Member]
item
Dec. 01, 2012
Adjusted EBITDA [Member]
Tranche 1 [Member]
Performance Awards [Member]
Dec. 01, 2012
Adjusted EBITDA [Member]
Tranche 2 [Member]
Performance Awards [Member]
Dec. 01, 2012
Adjusted EBITDA [Member]
Tranche 3 [Member]
Performance Awards [Member]
Dec. 01, 2012
Productivity Practice Sales [Member]
Performance Awards [Member]
item
Dec. 01, 2012
Productivity Practice Sales [Member]
Tranche 1 [Member]
Performance Awards [Member]
Dec. 01, 2012
Productivity Practice Sales [Member]
Tranche 2 [Member]
Performance Awards [Member]
Dec. 01, 2012
Productivity Practice Sales [Member]
Tranche 3 [Member]
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Shares authorized to be issued   68,085                    
Number of tranches         3       3      
Shares to vest after meeting certain requirements         15,887       6,808      
Adjusted EBITDA           $ 33,000,000 $ 40,000,000 $ 47,000,000        
Productivity Practice sales                   23,500,000 26,500,000 29,500,000
Life of performance awards   6 years                    
Whole-share grant per eligible director     50,000                  
Vesting period of awards     1 year                  
Shares issued under terms of the award     37,275                  
Unrecognized compensation expense       $ 29,000                
Price of common stock as a percent of the average fair market value 85.00%                      
Shares issued to employee stock purchase plan participants 11,731