Investments (Amortized Cost And Fair Value Of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 28, 2012	Jan. 28, 2012	Apr. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 10,736	$ 10,934	$ 14,720
Unrealized gains	1,015	1,055	779
Unrealized losses	(51)	(78)	(33)
Fair value	11,700	11,911	15,466
Short-term	721	658	3,275
Long-term	10,979	11,253	12,191
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value			7,745
U.S. Government And Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value			6,669
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value			1,052
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,615	5,808
Unrealized gains	513	530
Unrealized losses	(51)	(78)
Fair value	6,077	6,260
Short-term	463	658
Long-term	5,614	5,602
Investments [Member] \| Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,105	5,080	7,170
Unrealized gains	484	501	608
Unrealized losses	(51)	(78)	(33)
Fair value	5,538	5,503	7,745
Short-term	397	401
Long-term	5,141	5,102	7,745
Investments [Member] \| U.S. Government And Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost			6,589
Unrealized gains			80
Fair value			6,669
Short-term			2,809
Long-term			3,860
Investments [Member] \| Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	510	728	961
Unrealized gains	29	29	91
Unrealized losses
Fair value	539	757	1,052
Short-term	66	257	466
Long-term	473	500	586
Restricted Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,121	5,126
Unrealized gains	502	525
Unrealized losses
Fair value	5,623	5,651
Short-term	258
Long-term	5,365	5,651
Restricted Investments [Member] \| Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,358	1,357
Unrealized gains	81	94
Unrealized losses
Fair value	1,439	1,451
Short-term	258
Long-term	1,181	1,451
Restricted Investments [Member] \| U.S. Government And Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,763	3,769
Unrealized gains	421	431
Unrealized losses
Fair value	4,184	4,200
Short-term
Long-term	$ 4,184	$ 4,200

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References+ Details

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

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+ Details

- Definition

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details