Fair Value Measurements (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Jan. 30, 2016 |
Jan. 31, 2015 |
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
$ 63,561
|
$ 38,297
|
| Total Fair Market Value |
63,591
|
38,330
|
| Short-term Investments |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
32,671
|
15,850
|
| Gross Unrealized Gains |
5
|
9
|
| Gross Unrealized Losses |
1
|
|
| Total Fair Market Value |
32,675
|
15,859
|
| Short-term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 1 |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
8,763
|
8,780
|
| Gross Unrealized Gains |
3
|
9
|
| Gross Unrealized Losses |
1
|
|
| Total Fair Market Value |
8,765
|
8,789
|
| Short-term Investments | Obligations of states and municipalities | Fair Value, Inputs, Level 2 |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
2,930
|
2,074
|
| Gross Unrealized Gains |
2
|
|
| Total Fair Market Value |
2,932
|
2,074
|
| Short-term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 2 |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
20,978
|
4,996
|
| Total Fair Market Value |
20,978
|
4,996
|
| Long Term Investments |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
30,890
|
22,447
|
| Gross Unrealized Gains |
33
|
24
|
| Gross Unrealized Losses |
7
|
|
| Total Fair Market Value |
30,916
|
22,471
|
| Long Term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 1 |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
20,002
|
7,543
|
| Gross Unrealized Gains |
33
|
24
|
| Gross Unrealized Losses |
7
|
|
| Total Fair Market Value |
20,028
|
7,567
|
| Long Term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 2 |
|
|
| Investment securities classified as held to maturity |
|
|
| Amortized Cost |
10,888
|
14,904
|
| Total Fair Market Value |
$ 10,888
|
$ 14,904
|