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Dividend Program (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Apr. 27, 2014
Apr. 28, 2013
Apr. 27, 2014
Quarterly Dividend [Member]
Jan. 26, 2014
Quarterly Dividend [Member]
Oct. 27, 2013
Quarterly Dividend [Member]
Jul. 28, 2013
Quarterly Dividend [Member]
Apr. 28, 2013
Quarterly Dividend [Member]
Jan. 27, 2013
Quarterly Dividend [Member]
Oct. 28, 2012
Quarterly Dividend [Member]
Jul. 29, 2012
Quarterly Dividend [Member]
Apr. 28, 2013
Quarterly Dividend [Member]
Nov. 25, 2013
Quarterly Dividend [Member]
Jun. 12, 2013
Quarterly Dividend [Member]
Dec. 28, 2012
Special Dividend [Member]
Apr. 28, 2013
Special Dividend [Member]
Jun. 12, 2014
Subsequent Event [Member]
Jun. 12, 2014
Subsequent Event [Member]
Quarterly Dividend [Member]
Jun. 12, 2014
Subsequent Event [Member]
Special Dividend [Member]
Dividends [Line Items]                                    
Cash dividend payment, per share     $ 0.05 $ 0.05 $ 0.04 $ 0.04 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03     $ 0.50 $ 0.50      
Dividend declared date     Nov. 25, 2013 Nov. 25, 2013 Jun. 12, 2013 Jun. 12, 2013 Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012       Nov. 27, 2012      
Cash dividends paid $ 2,204 $ 7,593                 $ 1,500       $ 6,100      
Percentage increase in payment of quarterly cash dividend                       25.00% 33.00%          
Cash dividend declared, per share                                 $ 0.05 $ 0.40
Date of payment to shareholders entitled to dividends                               Jul. 15, 2014    
Date of record of shareholders entitled to dividends                               Jul. 01, 2014