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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 03, 2012
point
Y
Feb. 26, 2011
Feb. 27, 2010
Intangible Assets      
Estimated useful life of prescription files acquired in business combinations (in years) 10    
Estimated useful life of purchased prescription files acquired in other than business combinations (in years) 5    
Deferred Financing Costs      
Amortization expenses of deferred financing costs $ 22,049 $ 23,797 $ 20,789
Revenue Recognition      
Number of points awarded for each dollar spent towards front end merchandise 1    
Number of points are awarded for each qualifying prescription 25    
Accumulated number of points in a calendar year to achieve the "Gold" tier 1,000    
Percentage discount on qualifying purchases of front end merchandise on achieving "Gold" tier 20.00%    
Advertising      
Advertising expenses, net of vendor advertising allowances 369,405 367,412 375,118
Insurance      
Workers compensation occurrences 1,000    
General liability occurrences 2,000    
Buildings
     
Property, Plant and Equipment      
Useful life minimum (in years) 30    
Useful life maximum (in years) 45    
Equipment
     
Property, Plant and Equipment      
Useful life minimum (in years) 3    
Useful life maximum (in years) 15    
Internal-use software
     
Property, Plant and Equipment      
Capitalized costs $ 6,371 $ 4,759 $ 4,256