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Lines of Credit - Narrative (Detail)
3 Months Ended
Aug. 13, 2018
USD ($)
Jul. 29, 2018
USD ($)
Aug. 12, 2018
USD ($)
Jul. 29, 2018
CNY (¥)
Apr. 29, 2018
USD ($)
Jul. 30, 2017
USD ($)
Aug. 03, 2016
USD ($)
Aug. 01, 2016
USD ($)
Line of Credit Facility [Line Items]                
Outstanding amount   $ 4,000,000       $ 5,000,000    
United States [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Line of credit facility remaining borrowing capacity   $ 30,000,000            
Interest rate description   Interest was charged at a rate as a variable spread over LIBOR based on our ratio of debt to EBITDA.            
Applicable interest rate at end of period   3.53%   3.53% 3.36% 2.68%    
Expiration date   Aug. 15, 2018            
Reference rate on which the interest rate is based   LIBOR            
Percentage of common stock in subsidiary pledge as collateral   65.00%            
Outstanding amount   $ 4,000,000     $ 0 $ 5,000,000    
Letters of credit, outstanding amount   $ 250,000     250,000 250,000    
United States [Member] | Revolving Credit Facility [Member] | Third Amendment to Credit Agreement [Member]                
Line of Credit Facility [Line Items]                
Maximum amount of letters of credit               $ 7,500,000
Letters of credit outstanding, additional amount             $ 5,000,000  
Letter of credit expiration date   May 15, 2018            
United States [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]                
Line of Credit Facility [Line Items]                
Line of credit facility remaining borrowing capacity $ 25,000,000   $ 30,000,000          
Expiration date Aug. 15, 2020              
Letters of credit, outstanding amount $ 250,000              
Maximum amount of letters of credit 1,000,000              
Unencumbered Liquid Assets maintenance covenant $ 15,000,000   $ 20,000,000          
China [Member] | Revolving credit agreement [Member]                
Line of Credit Facility [Line Items]                
Line of credit facility remaining borrowing capacity   $ 5,900,000   ¥ 40,000,000        
Interest rate description   This agreement has an interest rate determined by the Chinese government            
Expiration date   Mar. 02, 2019            
Outstanding amount   $ 0   ¥ 0 $ 0 $ 0