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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended
May. 30, 2015
May. 31, 2014
Feb. 28, 2015
Non-financial assets measured on a non-recurring basis      
Outstanding derivative financial instruments $ 0   $ 0
Nonrecurring basis      
Non-financial assets measured on a non-recurring basis      
Carrying value of long-lived assets 1,289 $ 358  
Impairment charges 273 151  
Nonrecurring basis | Fair Value      
Non-financial assets measured on a non-recurring basis      
Fair value of Long-lived assets held for use 1,016 207  
Fair value of Total 1,016 207  
Nonrecurring basis | Level 1      
Non-financial assets measured on a non-recurring basis      
Carrying value of total long-term indebtedness 7,147,615    
Estimated fair value of total long-term indebtedness 7,428,669    
Nonrecurring basis | Level 3      
Non-financial assets measured on a non-recurring basis      
Fair value of Long-lived assets held for use 1,016 207  
Fair value of Total $ 1,016 $ 207