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Share-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Mar. 02, 2013
Feb. 25, 2012
Mar. 02, 2013
Feb. 25, 2012
Mar. 02, 2013
Performance Awards [Member]
Feb. 25, 2012
Performance Awards [Member]
Mar. 02, 2013
Performance Awards [Member]
Feb. 25, 2012
Performance Awards [Member]
Aug. 31, 2013
Performance Awards [Member]
Scenario, Forecast [Member]
Mar. 02, 2013
Management Stock Loan Shares [Member]
Mar. 02, 2013
Management Stock Loan Shares [Member]
Mar. 02, 2013
Unvested Share Awards [Member]
Feb. 25, 2012
Unvested Share Awards [Member]
Mar. 02, 2013
Unvested Share Awards [Member]
Feb. 25, 2012
Unvested Share Awards [Member]
Aug. 31, 2012
Unvested Share Awards [Member]
Mar. 02, 2013
Tranche 2 [Member]
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Revenue milestone goal $ 20,500,000                                
Transfer of common stock shares as payment on the loans 3,300,000                                
Share-based compensation expense 971,000 1,054,000 1,445,000 2,245,000 354,000 949,000 701,000 1,873,000   497,000 497,000 96,000 85,000 184,000 165,000    
Whole-share grant per eligible director                               50,000  
Vesting period of awards                               1 year  
Shares issued under terms of the award         10,610       16,000             30,672 18,028
Unrecognized compensation expense                       $ 300,000   $ 300,000      
Price of common stock as a percent of the average fair market value     85.00%                            
Shares issued to employee stock purchase plan participants 9,083   20,814