Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010
Significant Accounting Policies [Abstract]
Maximum original maturity of investments to be considered as cash equivalents	90 days
Advertising costs	$ 285,000	$ 232,000	$ 249,000
Income received for nonrecurring engineering services	$ 5,700,000	$ 11,700,000	$ 2,700,000