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Life Insurance Loans - Additional Information (Detail) - USD ($)
3 Months Ended
Sep. 03, 2017
Sep. 04, 2017
May 31, 2017
Schedule Of Life Insurance Liabilities [Line Items]      
Life insurance loans $ 4,312,000   $ 4,312,000
Subsequent Event [Member]      
Schedule Of Life Insurance Liabilities [Line Items]      
Weighted Average Interest Rate   6.30%  
Life insurance loans   $ 1,604,000  
Life Insurance Loans [Member]      
Schedule Of Life Insurance Liabilities [Line Items]      
Weighted Average Interest Rate 5.20%    
Life Insurance Loans [Member] | Minimum [Member]      
Schedule Of Life Insurance Liabilities [Line Items]      
Interest Rate 4.20%    
Life Insurance Loans [Member] | Maximum [Member]      
Schedule Of Life Insurance Liabilities [Line Items]      
Interest Rate 7.40%