Supplemental Executive Retirement Plan (Details) (USD $)	3 Months Ended
	Apr. 28, 2012	Apr. 30, 2011	Jan. 28, 2012
Components of net periodic benefit cost
Interest cost	$ 598,000	$ 657,000
Net amortization of unrecognized prior service cost	155,000	388,000
Net amortization of actuarial losses	835,000	589,000
Net periodic defined benefit pension cost	1,588,000	1,634,000
Cash surrender values of the insurance policies held in a rabbi trust	39,600,000		38,400,000
Gain as a result of the change in value of the insurance policy investments, included in other income	$ 1,200,000	$ 1,500,000