Investments (Textuals) (Details) (USD $)	3 Months Ended
Apr. 28, 2012	Apr. 30, 2011
Investment [Line Items]
Held-to-maturity Securities, Debt Maturity, Date Range, High	29 years
Held-to-maturity Securities, Debt Maturity, Date Range, Low	22 years
Realized gains resulted from the change in cash surrender value of insurance policies	$ 800,000	$ 700,000
Payments to Acquire Life Insurance Policies	$ 0	$ 0

The cash outflow for payments to purchase life insurance policies for which the entity is the beneficiary.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireLifeInsurancePolicies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration