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Debt (Details) - Line of Credit - Revolving Credit Facility - USD ($)
12 Months Ended
Nov. 02, 2015
Jan. 31, 2020
Mar. 26, 2019
Feb. 01, 2019
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 30,000,000   $ 30,000,000  
Debt instrument, term 1 year      
Debt instrument, term, extension 1 year      
Maximum amount outstanding during period $ 30,000,000      
Commitment fee percentage 0.35%      
Additional borrowing capacity $ 30,000,000      
Line of credit, outstanding balance   $ 0   $ 0
London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.30%