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Fair Value Measurements - Securities Carried at Amortized Cost Plus Accrued Interest (Details) - USD ($) $ in Thousands | Feb. 03, 2018 | Jan. 28, 2017
--- | --- | ---
Investment securities classified as held to maturity |  |
Amortized Cost | $ 56,951 | $ 64,717
Total Fair Market Value | 56,809 | 64,668
Short-term Investments |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 31,500 | 38,026
Gross Unrealized Gains | 1 | 3
Gross Unrealized Losses | (27) | (1)
Total Fair Market Value | 31,474 | 38,028
Short-term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 1 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 10,162 | 13,215
Gross Unrealized Losses | (25) |
Total Fair Market Value | 10,137 | 13,215
Short-term Investments | Obligations of states and municipalities | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 8,111 | 14,816
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (2) | (1)
Total Fair Market Value | 8,110 | 14,817
Short-term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 13,227 | 9,995
Gross Unrealized Gains |  | 1
Total Fair Market Value | 13,227 | 9,996
Long Term Investments |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 25,451 | 26,691
Gross Unrealized Losses | (116) | (51)
Total Fair Market Value | 25,335 | 26,640
Long Term Investments | Obligations of the U.S. Treasury | Fair Value, Inputs, Level 1 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 9,967 | 15,011
Gross Unrealized Losses | (116) | (51)
Total Fair Market Value | 9,851 | 14,960
Long Term Investments | Bank certificates of deposit | Fair Value, Inputs, Level 2 |  |
Investment securities classified as held to maturity |  |
Amortized Cost | 15,484 | 11,680
Total Fair Market Value | $ 15,484 | $ 11,680

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