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Dividend Program (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Jan. 27, 2013
Feb. 27, 2013
Quarterly dividends declared [Member]
Jan. 27, 2013
Quarterly Dividend [Member]
Oct. 28, 2012
Quarterly Dividend [Member]
Jul. 29, 2012
Quarterly Dividend [Member]
Jan. 27, 2013
Quarterly Dividend [Member]
Dec. 28, 2012
Special Dividend [Member]
Jan. 27, 2013
Special Dividend [Member]
Jan. 27, 2013
Special Dividend [Member]
Dividends [Line Items]                  
Cash dividend payment, per share     $ 0.03 $ 0.03 $ 0.03   $ 0.50    
Dividend declared date     Jun. 13, 2012 Jun. 13, 2012 Jun. 13, 2012     Nov. 27, 2012  
Cash dividends paid $ 7,226         $ 1,100     $ 6,100
Quarterly cash dividend payment, per share   $ 0.03              
Date of payment to shareholders entitled to dividends   Apr. 15, 2013              
Date of record of shareholders entitled to dividends   Apr. 01, 2013