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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Nov. 26, 2011
Nov. 27, 2010
Nov. 26, 2011
Nov. 27, 2010
Feb. 26, 2011
Nov. 26, 2011
Favorable leases and other
Y
Feb. 26, 2011
Favorable leases and other
Y
Nov. 26, 2011
Prescription files
Y
Feb. 26, 2011
Prescription files
Y
Nov. 26, 2011
Unfavorable lease intangibles
Feb. 26, 2011
Unfavorable lease intangibles
Finite-lived intangible assets                      
Gross carrying amount $ 1,859,772   $ 1,859,772   $ 1,837,998 $ 625,436 $ 620,786 $ 1,234,336 $ 1,217,212    
Accumulated amortization (1,298,809)   (1,298,809)   (1,191,821) (369,997) (335,692) (928,812) (856,129)    
Remaining weighted average amortization period (in years)           10 10 5 6    
Net carrying amount                   84,955 93,952
Amortization expense for intangible assets and liabilities 34,327 43,106 109,561 131,106              
Anticipated annual amortization expense for intangible assets and liabilities                      
2012     138,411                
2013     114,981                
2014     89,435                
2015     72,323                
2016     $ 60,995