Reconciliation of Assets Measured at Fair Value On Recurring Basis Using Unobservable Inputs (Level 3) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 6,347	$ 9,615
Settlements	(5,789)	(2,300)
Reported in earnings	(304)	233
Ending Balance	254	7,548
ARS | State and local government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	5,500	9,200
Settlements	(5,500)	(2,300)
Ending Balance		6,900
ARS Call Option
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	847	415
Settlements	(289)
Reported in earnings	(304)	233
Ending Balance	$ 254	$ 648