Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended
	Jan. 31, 2015 restricted_stock_award_type	Feb. 01, 2014	May 30, 2014	May 20, 2010
Defined Benefit Plan Disclosure [Line Items]
Types of restricted stock awards	2
Tax benefits (decrement) related to exercise of stock options and restricted stock dividends	$ (36,000)	$ (185,000)
Unrecognized compensation cost	1,173,000
Total reserved shares purchased	0	0
Career Based Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Expenses related to directors grants recognition period	3 years
Profit Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of months service completed by employees	6 months
Employees age	21 years
Maximum Percentage of contribution by participants under profit-sharing plan	15.00%
Percentage of employer matching contribution under profit-sharing plan	50.00%	50.00%
Percentage of maximum contributions made by employer	3.00%	3.00%
Profit-sharing plan expenses	400,000	400,000
2005 Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional share authorized for issuance under employee stock purchase plan			1,500,000
Common stock awarded			3,500,000
Shares granted under Incentive Award Plan	669,894	282,673
Stock-based compensation expense for restricted stock grants	900,000	800,000
Performance based shares vesting percentage on incremental basis over first and second fiscal year	50.00%
Common stock reserved for issuance	1,185,917
Director Restricted Stock Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expenses related to directors grants recognition period	3 years
Stock Option Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Tax benefits (decrement) related to exercise of stock options and restricted stock dividends	(36,000)	(185,000)
Options Vesting period granted prior to January 9, 2001	3 years
Options Vesting period granted After January 9, 2001	3 years
Employee Stock Purchase Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional share authorized for issuance under employee stock purchase plan				200,000
Common stock awarded				600,000
Value of common stock purchase by employees	85.00%
Total reserved shares purchased	476,041	451,914
Executive's Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash compensation deferred	0	0
Director Deferred Compensation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash compensation deferred	$ 0	$ 0