Investments (Details Textuals) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2011	Jul. 31, 2010	Jul. 30, 2011	Jul. 31, 2010
Investments (Textuals) [Abstract]
Realized gains resulted from the change in cash surrender value of insurance policies	$ 0.7	$ 0.6	$ 1.4	$ 1.1
Minimum [Member]
Investment [Line Items]
Maturity range of Company's marketable securities			17 years
Maximum [Member]
Investment [Line Items]
Maturity range of Company's marketable securities			32 years