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Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Fair Value Disclosures [Abstract]        
Long-lived assets, impairment charges $ 105,000 $ 193,000 $ 1,700,000 $ 193,000
Remaining unamortized basis $ 153,000 $ 337,000 $ 1,200,000 $ 337,000