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8. Employee Benefit Plans (Detail) - Schedule of Periodic Benefit Costs (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 29, 2012
Jul. 31, 2011
Jul. 29, 2012
Jul. 31, 2011
Net periodic benefit cost        
Service cost $ 64 $ 131 $ 128 $ 262
Interest cost 74 84 148 168
Actuarial gain (14) (82) (29) (163)
Net periodic benefit cost $ 124 $ 133 $ 247 $ 267