Fair Value Measurement - Amortized Cost and Fair Market Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands |
Oct. 29, 2016 |
Jan. 30, 2016 |
|---|---|---|
| Amortized Cost | ||
| Mature in one year or less | $ 34,132 | $ 32,671 |
| Mature after one year through five years | 29,183 | 30,890 |
| Total | 63,315 | 63,561 |
| Fair Market Value | ||
| Mature in one year or less | 34,135 | 32,675 |
| Mature after one year through five years | 29,213 | 30,916 |
| Total Fair Market Value | 63,348 | $ 63,591 |
| Changes among the fair value levels | ||
| Changes between Level 1 to Level 2, Assets | $ 0 |