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Dividend Program (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 29, 2018
Jul. 29, 2018
Jul. 30, 2017
Dividends [Line Items]      
Cash dividends paid   $ 1,127 $ 3,608
Special Dividend [Member]      
Dividends [Line Items]      
Cash dividends paid     $ 2,600
Cash dividend payment, per share     $ 0.21
Quarterly Dividend [Member]      
Dividends [Line Items]      
Cash dividends paid   $ 1,127 $ 1,000
Cash dividend payment, per share   $ 0.09 $ 0.08
Subsequent Event [Member] | Quarterly Dividend [Member]      
Dividends [Line Items]      
Cash dividend declared, per share $ 0.09    
Date of payment to shareholders entitled to dividends Oct. 15, 2018    
Date of record of shareholders entitled to dividends Oct. 01, 2018