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Fair Value of Financial Instruments Fair Value Disclosures (Tables)
 9 Months Ended
Oct. 28, 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 October 28, 2017 and January 28, 2017 (in thousands):
 
Level 1
 
Level 2
 
Level 3
 
October 28, 2017
 
January 28, 2017
 
October 28, 2017
 
January 28, 2017
 
October 28, 2017
 
January 28, 2017
Cash equivalents(1)
$
1,090

 
$
—

 
$
12,566

 
$
—

 
$
—

 
$
—

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

 
—

 
9,650

 
—

 
—

 
—

    Commercial paper
—

 
—

 
4,995

 
—

 
—

 
—

    Municipal securities
—

 
—

 
3,643

 
—

 
—

 
—

    Non-U.S. corporate debt securities
—

 
—

 
3,445

 
—

 
—

 
—

    Certificate of deposit
—

 
—

 
—

 
30,152

 
—

 
—

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

 
—

 
5,617

 
—

 
—

 
—

    Non-U.S. corporate debt securities
—

 
—

 
5,284

 
—

 
—

 
—

    Municipal securities
—

 
—

 
2,147

 
—

 
—

 
—

    U.S. treasury securities
2,004

 
—

 
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
(1) Cash equivalents include a money market fund, commercial paper 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.