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Dividend Program (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 12, 2019
Apr. 28, 2019
Jan. 27, 2019
Oct. 28, 2018
Jul. 29, 2018
Apr. 29, 2018
Jan. 28, 2018
Oct. 29, 2017
Jul. 30, 2017
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Dividends [Line Items]                        
Cash dividends paid   $ 1,239 $ 1,240 $ 1,126 $ 1,127 $ 1,121 $ 1,119 $ 995 $ 3,608 $ 4,732 $ 6,843 $ 6,280
Cash dividend payment, per share   $ 0.10 $ 0.10 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.08 $ 0.29      
Quarterly Dividend [Member]                        
Dividends [Line Items]                        
Cash dividends paid                   $ 4,700 $ 4,200 $ 3,700
Quarterly Dividend [Member] | Minimum [Member]                        
Dividends [Line Items]                        
Cash dividend payment, per share                   $ 0.09 $ 0.08 $ 0.07
Quarterly Dividend [Member] | Maximum [Member]                        
Dividends [Line Items]                        
Cash dividend payment, per share                   $ 0.10 $ 0.09 $ 0.08
Special Dividend [Member]                        
Dividends [Line Items]                        
Cash dividends paid                     $ 2,600 $ 2,600
Cash dividend payment, per share                     $ 0.21 $ 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 Jul. 16, 2019                      
Date of record of shareholders entitled to dividends Jul. 05, 2019