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Intangible Assets (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Aug. 27, 2011
Aug. 30, 2010
Aug. 27, 2011
Aug. 28, 2010
Feb. 26, 2011
Aug. 27, 2011
Favorable leases and other
Feb. 26, 2011
Favorable leases and other
Aug. 27, 2011
Prescription files
Feb. 26, 2011
Prescription files
Aug. 27, 2011
Unfavorable lease intangibles
Feb. 26, 2011
Unfavorable lease intangibles
Finite-lived intangible assets                      
Gross carrying amount $ 1,851,798   $ 1,851,798   $ 1,837,998 $ 623,173 $ 620,786 $ 1,228,625 $ 1,217,212    
Accumulated amortization (1,266,884)   (1,266,884)   (1,191,821) (358,571) (335,692) (908,313) (856,129)    
Remaining weighted average amortization period (in years)           10Y 10Y 5Y 6Y    
Net carrying amount                   87,728 93,952
Amortization expense for intangible assets and liabilities 34,121 43,561 75,234 88,001              
Anticipated annual amortization expense for intangible assets and liabilities                      
2012     137,483                
2013     112,876                
2014     87,410                
2015     70,242                
2016     $ 58,908