Equity and Incentive Compensation Plans - Summary of Restricted Unit Activity (Detail) (USD $)	9 Months Ended
	Oct. 27, 2012
Time-Based Restricted Units
Number of Shares
Balance at beginning of period (shares)	175,353
Vested (shares)	(86,165)
Forfeited (shares)	(14,172)
Balance at end of period (shares)	75,016
Weighted Average Grant Date Fair Value
Balance at beginning of period (dollars per share)	$ 19.58
Vested (dollars per share)	$ 19.58
Forfeited (dollars per share)	$ 19.58
Balance at end of period (dollars per share)	$ 19.58
Performance-Based Restricted Units
Number of Shares
Balance at beginning of period (shares)	98,670
Vested (shares)	(27,871)
Forfeited (shares)	(24,796)
Balance at end of period (shares)	46,003
Weighted Average Grant Date Fair Value
Balance at beginning of period (dollars per share)	$ 19.58
Vested (dollars per share)	$ 19.58
Forfeited (dollars per share)	$ 19.58
Balance at end of period (dollars per share)	$ 19.58