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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. 28, 2013
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]
Dec. 28, 2012
Special Dividend [Member]
Apr. 28, 2013
Special Dividend [Member]
Jun. 12, 2013
Quarterly dividends declared [Member]
Dividends [Line Items]                  
Cash dividend payment, per share   $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.50    
Dividend declared date   Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012   Nov. 27, 2012  
Cash dividends paid $ 7,593         $ 1,500   $ 6,100  
Percentage increase in payment of quarterly cash dividend                 33.00%
Quarterly cash dividend payment, per share                 $ 0.04
Date of payment to shareholders entitled to dividends                 Jul. 15, 2013
Date of record of shareholders entitled to dividends                 Jul. 01, 2013