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Common Stock Repurchase Program (Detail) (USD $)
9 Months Ended 12 Months Ended 21 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
Jan. 27, 2013
Apr. 29, 2012
Jan. 27, 2013
Aug. 29, 2012
Common Stock Repurchase Program August 2012 [Member]
Common Stock
Jan. 27, 2013
Common Stock Repurchase Program June 2012 [Member]
Common Stock
Apr. 29, 2012
Common Stock Repurchase Program Fiscal 2012 [Member]
Common Stock
Stockholders Equity Note [Line Items]            
Authorization amount for repurchase of common stock       $ 2,000,000 $ 5,000,000 $ 7,000,000
Cost of common stock repurchased $ 5,022,000 $ 5,384,000 $ 10,400,000   $ 5,000,000 $ 5,384,000
Common stock repurchased     1,100,000   502,595