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Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Oct. 31, 2015
Jan. 31, 2015
Nov. 01, 2014
Fair value disclosures      
Subordinated debentures $ 200,000 $ 200,000 $ 200,000
Fair Value of Assets      
Fair value disclosures      
Long-term debt, including current portion, fair value 692,000    
Subordinated debentures 213,000    
Carrying value      
Fair value disclosures      
Long-term debt, including current portion 615,000    
Subordinated debentures $ 200,000