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Activity of Auction Rate Securities, Fair Value Measured using Level Three Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
May 04, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Carrying value beginning balance $ 1,730
Redemptions (50) [1]
Total gains  
Included in earnings   
Included in other comprehensive income 4 [2]
Carrying value ending balance $ 1,684
[1] Redemptions of $50,000 occurred during the first quarter of fiscal 2013.
[2] Unrealized losses of $6,000 and a recovery in fair value of $10,000 occurred during the first quarter of fiscal 2013.