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Variable Interest Entity (Narrative) (Details)
$ in Thousands
9 Months Ended
Aug. 18, 2017
USD ($)
Oct. 29, 2017
USD ($)
entity
Jan. 29, 2017
USD ($)
entity
Variable Interest Entities [Line Items]      
Property and equipment   $ 85,462 $ 56,325
Non-current liability related to build-to-suit lease transactions   18,484 $ 3,349
Amount invested in a trust   $ 6,323  
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Number of variable interest entity | entity   1 1
Mt. Horeb, Wisconsin [Member] | Corporate Trust [Member] | TRI Holdings, LLC [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Amount invested in a trust $ 6,300    
Build-to-Suit Lease [Member] | Capitalized [member]      
Variable Interest Entities [Line Items]      
Property and equipment   $ 27,500 $ 6,600