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Dividend Program (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Dec. 05, 2019
Nov. 03, 2019
Oct. 28, 2018
Dividends [Line Items]      
Cash dividends paid   $ 2,482 $ 2,253
Quarterly Dividend [Member]      
Dividends [Line Items]      
Cash dividends paid   $ 2,500 $ 2,300
Cash dividend payment, per share   $ 0.10 $ 0.09
Subsequent Event [Member] | Quarterly Dividend [Member]      
Dividends [Line Items]      
Cash dividend declared, per share $ 0.105    
Date of payment to shareholders entitled to dividends Jan. 17, 2019    
Date of record of shareholders entitled to dividends Jan. 08, 2019    
Subsequent Event [Member] | Annualized Dividend [Member]      
Dividends [Line Items]      
Cash dividend declared, per share $ 0.42