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Lines of Credit - Narrative (Detail)
9 Months Ended
Aug. 13, 2018
USD ($)
Jan. 27, 2019
USD ($)
Jan. 27, 2019
CNY (¥)
Aug. 12, 2018
USD ($)
Apr. 29, 2018
USD ($)
Jan. 28, 2018
USD ($)
Aug. 03, 2016
USD ($)
Aug. 01, 2016
USD ($)
United States [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity $ 25,000,000     $ 30,000,000 $ 30,000,000      
Unencumbered Liquid Assets maintenance covenant 15,000,000     $ 20,000,000        
Maximum amount of letters of credit 1,000,000              
Letters of credit, outstanding amount $ 250,000 $ 250,000     $ 250,000 $ 250,000    
Expiration date Aug. 15, 2020              
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   3.95% 3.95%   3.36% 3.02%    
Reference rate on which the interest rate is based   LIBOR            
Percentage of common stock in subsidiary pledge as collateral   65.00%            
Outstanding amount   $ 0     $ 0 $ 0    
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            
China [Member] | Revolving credit agreement [Member]                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity   $ 6,000,000 ¥ 40,000,000          
Expiration date   Mar. 02, 2019            
Interest rate description   This agreement has an interest rate determined by the Chinese government            
Outstanding amount   $ 0 ¥ 0   $ 0 $ 0