Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($)	Jan. 28, 2017	Jan. 30, 2016
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 46,000	$ 37,127,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	29,000
Held-to-maturity Securities, Fair Value	45,000	37,098,000
Corporate Bond Securities [Member] | Other Long-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	6,265
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0
Held-to-maturity Securities, Fair Value	6,000
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment		6,916,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		6,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities, Fair Value		6,923,000
Municipal Bonds [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	78,000	46,335,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	6,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	29,000
Held-to-maturity Securities, Fair Value	78,000	46,312,000
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	32,000	2,291,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity Securities, Fair Value	32,000	$ 2,291,000
Municipal Bonds [Member] | Other Long-term Investments [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	11,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0
Held-to-maturity Securities, Fair Value	11,000
Municipal Bonds [Member] | Other Long-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	4,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0
Held-to-maturity Securities, Fair Value	$ 4,000