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Investments (Tables)
 3 Months Ended
May 05, 2018
Schedule of Investments [Abstract]  
Schedule of investments, cost and fair value
The following is a summary of investments as of May 5, 2018:
 
 
Amortized
Cost or
Par Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Other-than-
Temporary
Impairment
 
Estimated
Fair
Value
Available-for-Sale Securities:
 
 
 
 
 
 
 
 
 
Auction-rate securities
$
1,675

 
$
—

 
$
(120
)
 
$
—

 
$
1,555

 
 
 
 
 
 
 
 
 
 
Held-to-Maturity Securities:
 
 
 

 
 

 
 

 
 

State and municipal bonds
$
55,684

 
$
1

 
$
(106
)
 
$
—

 
$
55,579

 
 
 
 
 
 
 
 
 
 
Trading Securities:
 

 
 

 
 

 
 

 
 

Mutual funds
$
14,125

 
$
1,212

 
$
—

 
$
—

 
$
15,337

 
The following is a summary of investments as of February 3, 2018:
 
 
Amortized
Cost or
Par Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Other-than-
Temporary
Impairment
 
Estimated
Fair
Value
Available-for-Sale Securities:
 
 
 
 
 
 
 
 
 
Auction-rate securities
$
1,725

 
$
—

 
$
(120
)
 
$
—

 
$
1,605

 
 
 
 
 
 
 
 
 
 
Held-to-Maturity Securities:
 
 
 

 
 

 
 

 
 

State and municipal bonds
$
55,527

 
$
9

 
$
(76
)
 
$
—

 
$
55,460

 
 
 
 
 
 
 
 
 
 
Trading Securities:
 

 
 

 
 

 
 

 
 

Mutual funds
$
13,746

 
$
1,408

 
$
—

 
$
—

 
$
15,154
Schedule of amortized cost and fair value of debt securities by contractual maturity
The amortized cost and fair value of debt securities by contractual maturity as of May 5, 2018 is as follows:
 
 
Amortized
Cost
 
Fair
Value
Held-to-Maturity Securities
 
 
 
Less than 1 year
$
54,700

 
$
54,596

1 - 5 years
984

 
983

 
$
55,684

 
$
55,579