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Fair Value - Additional Information (Detail) - USD ($)
9 Months Ended
Feb. 01, 2017
Oct. 28, 2017
Feb. 28, 2017
Term Loan [Member]      
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]      
Credit facility, maximum borrowing capacity   $ 8,648,000  
Bank of America, N.A. [Member] | Term Loan [Member]      
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]      
Credit facility, maximum borrowing capacity     $ 9,200,000
Contingent Consideration Liability [Member]      
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]      
Estimated target period   7 years  
Estimated earnout targets $ 407,000 $ 400,000  
Estimated earnout targets $ 1,280,000 $ 1,400,000  
Contingent Consideration Liability [Member] | Minimum [Member]      
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]      
Fair value assumptions, risk-adjusted discount rate 1.77% 1.58%  
Probability of success 1.60% 0.00%  
Contingent Consideration Liability [Member] | Maximum [Member]      
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]      
Fair value assumptions, risk-adjusted discount rate 3.35% 2.76%  
Probability of success 87.20% 46.80%