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Fair Value Measurements - Securities Carried at Amortized Cost Plus Accrued Interest (Details) - USD ($) $ in Thousands | Feb. 02, 2019 | Feb. 03, 2018
--- | --- | ---
Investment securities classified as held to maturity |  |
Amortized Cost | $ 59,233 | $ 56,951
Fair Market Value | 59,184 | 56,809
Short-term Investments |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 50,350 | 31,500
Gross Unrealized Gains | 4 | 1
Gross Unrealized Losses | (37) | (27)
Fair Market Value | 50,317 | 31,474
Short-term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 1 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 38,706 |
Gross Unrealized Gains | 4 |
Gross Unrealized Losses | (37) |
Fair Market Value | 38,673 |
Short-term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost |  | 10,162
Gross Unrealized Losses |  | (25)
Fair Market Value |  | 10,137
Short-term Investments | Obligations of states and municipalities | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 95 | 8,111
Gross Unrealized Gains |  | 1
Gross Unrealized Losses |  | (2)
Fair Market Value | 95 | 8,110
Short-term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 1 |  |
Investment securities classified as held to maturity |  |
Amortized Cost |  | 13,227
Fair Market Value |  | 13,227
Short-term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 11,549 |
Fair Market Value | 11,549 |
Long Term Investments |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 8,883 | 25,451
Gross Unrealized Losses | (16) | (116)
Fair Market Value | 8,867 | 25,335
Long Term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 1 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 4,956 | 9,967
Gross Unrealized Losses | (16) | (116)
Fair Market Value | 4,940 | 9,851
Long Term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 3,927 | 15,484
Fair Market Value | $ 3,927 | $ 15,484

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