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Lines of Credit - Narrative (Detail)
6 Months Ended
Aug. 13, 2018
USD ($)
Oct. 28, 2018
USD ($)
Oct. 28, 2018
CNY (¥)
Aug. 12, 2018
USD ($)
Apr. 29, 2018
USD ($)
Oct. 29, 2017
USD ($)
Oct. 28, 2017
USD ($)
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   3.75% 3.75%   3.36% 2.69%      
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   $ 5,700,000 ¥ 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