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Activity of Auction Rate Securities, Fair Value Measured using Level 3 Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 28, 2012
Apr. 28, 2012
Jul. 28, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Carrying value beginning balance   $ 1,722 $ 1,722
Total gains      
Included in earnings       
Included in other comprehensive (loss) income (3) 5 2 [1]
Carrying value ending balance $ 1,724   $ 1,724
[1] Unrealized gains of $5,000 and unrealized losses $3,000 occurred during the first and second quarters of fiscal 2012, respectively.