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Dividend Program (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Jan. 26, 2014
Jan. 27, 2013
Jan. 26, 2014
Quarterly Dividend [Member]
Oct. 27, 2013
Quarterly Dividend [Member]
Jan. 26, 2014
Quarterly Dividend [Member]
Jan. 27, 2013
Quarterly Dividend [Member]
Apr. 28, 2013
Quarterly Dividend [Member]
Nov. 25, 2013
Quarterly Dividend [Member]
Jun. 12, 2013
Quarterly Dividend [Member]
Jan. 27, 2013
Special Dividend [Member]
Feb. 25, 2014
Subsequent Event [Member]
Quarterly Dividend [Member]
Dividends [Line Items]                      
Percentage increase in payment of quarterly cash dividend               25.00% 33.00%    
Cash dividend payment, per share     $ 0.05 $ 0.04   $ 0.03 $ 0.03     $ 0.50  
Cash dividend declared, per share                     $ 0.05
Date of payment to shareholders entitled to dividends                     Apr. 15, 2014
Date of record of shareholders entitled to dividends                     Apr. 01, 2014
Cash dividends paid $ 1,592 $ 7,226     $ 1,592 $ 1,100       $ 6,100