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Fair value measurements (Details 2) (Level 3, USD $)
In Thousands, unless otherwise specified
Nov. 30, 2013
Mar. 02, 2013
Nov. 24, 2012
Carrying value
     
Fair value measurements      
Fair value $ 351,838 $ 285,371 $ 302,589
Carrying value | U.S. | Secured revolving credit
     
Fair value measurements      
Fair value 14,000   15,000
Carrying value | Secured term loan | U.S.
     
Fair value measurements      
Fair value 329,439 272,938 273,625
Carrying value | Secured term loan | Sweden
     
Fair value measurements      
Fair value 2,864 5,812 6,570
Carrying value | Other loans
     
Fair value measurements      
Fair value 5,535 6,621 7,394
Fair value
     
Fair value measurements      
Fair value 351,919 274,257 291,498
Fair value | U.S. | Secured revolving credit
     
Fair value measurements      
Fair value 14,000   15,000
Fair value | Secured term loan | U.S.
     
Fair value measurements      
Fair value 329,439 261,718 262,406
Fair value | Secured term loan | Sweden
     
Fair value measurements      
Fair value 2,959 5,864 6,628
Fair value | Other loans
     
Fair value measurements      
Fair value $ 5,521 $ 6,675 $ 7,464