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Dividend Program (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 15, 2016
May 01, 2016
Jan. 31, 2016
Nov. 01, 2015
Aug. 02, 2015
May 03, 2015
Feb. 01, 2015
Nov. 02, 2014
Aug. 03, 2014
May 01, 2016
May 03, 2015
Apr. 27, 2014
Dividends [Line Items]                        
Cash dividends paid   $ 859 $ 864 $ 741 $ 5,676 $ 733 $ 733 $ 611 $ 5,502 $ 8,140 $ 7,579 $ 2,204
Cash dividend payment, per share   $ 0.07 $ 0.07 $ 0.06 $ 0.46 $ 0.06 $ 0.06 $ 0.05 $ 0.45      
Special Dividend [Member]                        
Dividends [Line Items]                        
Cash dividends paid         $ 5,000       $ 4,900      
Cash dividend payment, per share         $ 0.40       $ 0.40      
Quarterly Dividend [Member]                        
Dividends [Line Items]                        
Cash dividends paid                   $ 3,100 $ 2,700 $ 2,200
Quarterly Dividend [Member] | Minimum [Member]                        
Dividends [Line Items]                        
Cash dividend payment, per share                   $ 0.06 $ 0.05 $ 0.04
Quarterly Dividend [Member] | Maximum [Member]                        
Dividends [Line Items]                        
Cash dividend payment, per share                   $ 0.07 $ 0.06 $ 0.05
Subsequent Event [Member] | Special Dividend [Member]                        
Dividends [Line Items]                        
Cash dividend declared, per share $ 0.21                      
Subsequent Event [Member] | Quarterly Dividend [Member]                        
Dividends [Line Items]                        
Cash dividend declared, per share $ 0.07                      
Date of payment to shareholders entitled to dividends Jul. 15, 2016                      
Date of record of shareholders entitled to dividends Jul. 01, 2016