Fair Value Measurements - Amortized Cost and Fair Market Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands |
Feb. 03, 2018 |
Jan. 28, 2017 |
Jan. 30, 2016 |
|---|---|---|---|
| Amortized Cost | |||
| Mature in one year or less | $ 31,500 | $ 38,026 | |
| Mature after one year through five years | 25,451 | 26,691 | |
| Total | 56,951 | 64,717 | |
| Fair Market Value | |||
| Mature in one year or less | 31,474 | 38,028 | |
| Mature after one year through five years | 25,335 | 26,640 | |
| Total Fair Market Value | 56,809 | 64,668 | |
| Changes among the fair value levels | |||
| Changes between Level 1 to Level 2, Assets | 0 | 0 | $ 0 |
| Changes between Level 2 to Level 1, Assets | $ 0 | $ 0 | $ 0 |