Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Aug. 03, 2013	Jul. 28, 2012	Aug. 03, 2013	Jul. 28, 2012
Benefit Plans
Employer contributions to pension plan	$ 700,000		$ 1,400,000
Expected employer contributions to pension plan for remainder of current fiscal year	1,300,000		1,300,000
Components of net periodic benefit costs:
Service cost	1,059,000	817,000	2,118,000	1,634,000
Interest cost	1,695,000	1,823,000	3,391,000	3,647,000
Net actuarial loss	753,000	1,283,000	1,506,000	2,566,000
Amortization of prior service cost	24,000	157,000	48,000	313,000
Plan curtailment gain			(1,480,000)
Net periodic benefit costs	$ 3,531,000	$ 4,080,000	$ 5,583,000	$ 8,160,000