Fair value measurements (Details 2) - USD ($)
$ in Thousands
May. 30, 2015
Feb. 28, 2015
May. 31, 2014
Carrying value      
Fair value measurements      
Fair value $ 338,836 $ 332,094 $ 338,047
Fair value      
Fair value measurements      
Fair value 336,608 327,830 337,227
Level 2 | Carrying value | Elfa | Elfa Term Loan Facility      
Fair value measurements      
Fair value     935
Level 2 | Carrying value | Elfa | 2014 Elfa term loan facility      
Fair value measurements      
Fair value 5,983 6,463  
Level 2 | Carrying value | Senior secured term loan facility      
Fair value measurements      
Fair value 324,005 324,911 327,628
Level 2 | Fair value | Elfa | Elfa Term Loan Facility      
Fair value measurements      
Fair value     935
Level 2 | Fair value | Elfa | 2014 Elfa term loan facility      
Fair value measurements      
Fair value 5,983 6,463  
Level 2 | Fair value | Senior secured term loan facility      
Fair value measurements      
Fair value 321,777 320,647 326,808
Level 3 | Carrying value | Revolving credit facility      
Fair value measurements      
Fair value 8,000   8,000
Level 3 | Carrying value | Other loans      
Fair value measurements      
Fair value     1,484
Level 3 | Carrying value | Other loans and capital leases      
Fair value measurements      
Fair value 848 720  
Level 3 | Fair value | Revolving credit facility      
Fair value measurements      
Fair value 8,000   8,000
Level 3 | Fair value | Other loans      
Fair value measurements      
Fair value     $ 1,484
Level 3 | Fair value | Other loans and capital leases      
Fair value measurements      
Fair value $ 848 $ 720