Securities Available for Sale - Fair Value, Amortized Cost and Gross Unrealized Gains and Losses of the Securities (Detail) (State and Municipal Obligations [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Aug. 02, 2014	Jan. 31, 2014
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 14,774	$ 18,729
Gross Unrealized Gains	34	37
Gross Unrealized Losses
Fair Value	$ 14,808	$ 18,766