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Marketable Securities (Tables)
 12 Months Ended
Mar. 04, 2017
Marketable Securities [Abstract]  
Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale
(In thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated
Fair
Value
March 4, 2017
 
 
 
 
 
 
 
Municipal bonds
$
9,595

 
$
91

 
$
(97
)
 
$
9,589

Total marketable securities
$
9,595

 
$
91

 
$
(97
)
 
$
9,589

February 27, 2016
 
 
 
 
 
 
 
Mutual fund
$
30,178

 
$
—

 
$
(55
)
 
$
30,123

Municipal bonds
12,393

 
285

 
(109
)
 
12,569

Total marketable securities
$
42,571


$
285


$
(164
)

$
42,692
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions
The following table presents the length of time that our securities were in continuous unrealized loss positions, but were not deemed to be other than temporarily impaired, as of March 4, 2017: 
 
Less Than 12 Months
 
Greater Than or Equal  to
12 Months
 
Total
(In thousands)
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Municipal bonds
$
1,413

 
$
(14
)
 
$
1,167

 
$
(83
)
 
$
2,580

 
$
(97
)
Schedule of amortized cost and estimated fair values of investments by contractual maturity
The amortized cost and estimated fair values of our municipal bonds at March 4, 2017, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities, as borrowers may have the right to call or prepay obligations with or without penalty. Gross realized gains and losses were insignificant for all periods presented.
(In thousands)
Amortized Cost
 
Estimated Market Value
Due within one year
$
548

 
$
548

Due after one year through five years
3,003

 
3,028

Due after five years through 10 years
4,553

 
4,605

Due after 10 years through 15 years
1,491

 
1,408

Total
$
9,595

 
$
9,589