Activity of Auction Rate Securities, Fair Value Measured using Level Three Inputs (Detail) (USD $)	3 Months Ended			12 Months Ended
	Oct. 27, 2012	Jul. 28, 2012	Apr. 30, 2012	Feb. 02, 2013		Jan. 28, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying value at beginning of year			$ 1,722,000	$ 1,722,000		$ 2,475,000
Redemptions						(850,000)
Total gains
Included in earnings
Included in other comprehensive income	(6,000)	3,000	(5,000)	8,000	[1]	97,000
Carrying value at end of year				$ 1,730,000		$ 1,722,000

[1] Unrealized gains of $5,000 and $6,000 occurred during the first and third quarters of fiscal 2012, respectively, and unrealized losses of $3,000 occurred during the second quarter of fiscal 2012.