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6. Intangible Assets (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 30, 2017
May 01, 2016
Jan. 28, 2018
6. Intangible Assets (Details) [Line Items]      
Amortization of Intangible Assets $ 334,000 $ 1,654,000  
Scenario, Forecast [Member]      
6. Intangible Assets (Details) [Line Items]      
Amortization of Intangible Assets     $ 334,000