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Fair Value of Financial Instruments Fair Value Disclosures (Tables)
 6 Months Ended
Jul. 29, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements of Investments
The following table details the fair value measurements of the Company's investments as of July 29, 2017 and January 28, 2017 (in thousands):
 
Level 1
 
Level 2
 
Level 3
 
July 29, 2017
 
January 28, 2017
 
July 29, 2017
 
January 28, 2017
 
July 29, 2017
 
January 28, 2017
Cash equivalents(1)
$
2,957

 
$
—

 
$
11,362

 
$
—

 
$
—

 
$
—

Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
    Municipal securities
—

 
—

 
4,872

 
—

 
—

 
—

    Commercial paper
—

 
—

 
3,992

 
—

 
—

 
—

    U.S. corporate debt securities
—

 
—

 
6,634

 
—

 
—

 
—

    Non-U.S. corporate debt securities
—

 
—

 
2,943

 
—

 
—

 
—

    Certificate of deposit
—

 
—

 
—

 
30,152

 
—

 
—

Long-term investments:
 
 
 
 
 
 
 
 
 
 
 
    U.S. corporate debt securities
—

 
—

 
8,655

 
—

 
—

 
—

    Non-U.S. corporate debt securities
—

 
—

 
5,794

 
—

 
—

 
—

    Municipal securities
—

 
—

 
1,059

 
—

 
—

 
—

    U.S. treasury securities
2,018

 
—

 
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
(1) Cash equivalents include a money market fund, commercial paper, non-U.S. corporate debt securities and municipal securities that have a maturity of three months or less at the date of purchase. Due to their short maturity, the Company believes the carrying value approximates fair value.