Investments And Restricted Investments (Maturities Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 28, 2012	Jan. 28, 2012	Apr. 30, 2011
Investments and Restricted Investments [Line Items]
Total, Cost basis	$ 10,736	$ 10,934	$ 14,720
Total, Estimated fair value	11,700	11,911	15,466
Investments [Member]
Investments and Restricted Investments [Line Items]
Maturing in one year or less, Cost basis	450
Maturing after one year through five years, Cost basis	4,066
Maturing after five years through ten years, Cost basis	1,099
Total, Cost basis	5,615	5,808
Maturing in one year or less, Estimated fair value	463
Maturing after one year through five years, Estimated fair value	4,274
Maturing after five through ten years, Estimated fair value	1,340
Total, Estimated fair value	6,077	6,260
Restricted Investments [Member]
Investments and Restricted Investments [Line Items]
Maturing in one year or less, Cost basis	248
Maturing after one year through five years, Cost basis	1,954
Maturing after five years through ten years, Cost basis	2,919
Total, Cost basis	5,121	5,126
Maturing in one year or less, Estimated fair value	258
Maturing after one year through five years, Estimated fair value	2,138
Maturing after five through ten years, Estimated fair value	3,227
Total, Estimated fair value	$ 5,623	$ 5,651