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Dividend Program (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Nov. 29, 2018
Oct. 28, 2018
Oct. 29, 2017
Dividends [Line Items]      
Cash dividends paid   $ 2,253 $ 4,603
Quarterly Dividend [Member]      
Dividends [Line Items]      
Cash dividends paid   $ 2,253 $ 2,000
Cash dividend payment, per share   $ 0.09 $ 0.08
Special Dividend [Member]      
Dividends [Line Items]      
Cash dividends paid     $ 2,600
Cash dividend payment, per share     $ 0.21
Subsequent Event [Member] | Quarterly Dividend [Member]      
Dividends [Line Items]      
Cash dividend declared, per share $ 0.10    
Date of payment to shareholders entitled to dividends Jan. 16, 2019    
Date of record of shareholders entitled to dividends Jan. 02, 2019