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Short-Term Investments (Tables)
12 Months Ended
Jan. 31, 2017
Investments Debt And Equity Securities [Abstract]  
Schedule of Short-Term Investments

At January 31, 2017, short-term investments consisted of the following (in thousands):

 

 

 

 

 

 

Gross

 

 

Gross

 

 

Estimated

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

Cost

 

 

Gains

 

 

Losses

 

 

Value

 

Available-for-sale securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Asset-backed securities

$

20,729

 

 

$

5

 

 

$

(16

)

 

$

20,718

 

Commercial paper

 

20,567

 

 

 

4

 

 

 

(1

)

 

 

20,570

 

Corporate notes and bonds

 

92,843

 

 

 

14

 

 

 

(101

)

 

 

92,756

 

U.S. agency obligations

 

87,091

 

 

 

12

 

 

 

(51

)

 

 

87,052

 

U.S. treasury securities

 

80,277

 

 

 

4

 

 

 

(111

)

 

 

80,170

 

Total available-for-sale securities

$

301,507

 

 

$

39

 

 

$

(280

)

 

$

301,266

 

 

At January 31, 2016, short-term investments consisted of the following (in thousands):

 

 

 

 

 

 

Gross

 

 

Gross

 

 

Estimated

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

Cost

 

 

Gains

 

 

Losses

 

 

Value

 

Available-for-sale securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Asset-backed securities

$

5,456

 

 

$

—

 

 

$

(2

)

 

$

5,454

 

Commercial paper

 

5,970

 

 

 

—

 

 

 

—

 

 

 

5,970

 

Corporate notes and bonds

 

38,341

 

 

 

26

 

 

 

(40

)

 

 

38,327

 

U.S. agency obligations

 

124,626

 

 

 

14

 

 

 

(54

)

 

 

124,586

 

U.S. treasury securities

 

39,720

 

 

 

4

 

 

 

(37

)

 

 

39,687

 

Total available-for-sale securities

$

214,113

 

 

$

44

 

 

$

(133

)

 

$

214,024

 

 

Summary of Estimated Fair Value of Short-Term Investments, Designated as Available-for-Sale and Classified by Contractual Maturity

The following table summarizes the estimated fair value of our short-term investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of the dates shown (in thousands):

 

 

January 31,

 

 

2017

 

 

2016

 

Due in one year or less

$

225,183

 

 

$

151,214

 

Due in greater than one year

 

76,083

 

 

 

62,810

 

Total

$

301,266

 

 

$

214,024

 

 

Schedule of Fair Values and Gross Unrealized Losses (Aggregated by Investment Category) of Available-for-Sale Securities

The following table shows the fair values and the gross unrealized losses (aggregated by investment category) of our available-for-sale securities which were in gross unrealized loss position as of January 31, 2017 (in thousands):   

 

 

 

 

 

 

Gross

 

 

Fair

 

 

Unrealized

 

 

Value

 

 

Losses

 

Asset-backed securities

$

14,027

 

 

$

(16

)

Commercial paper

 

5,694

 

 

 

(1

)

Corporate notes and bonds

 

67,220

 

 

 

(101

)

U.S. agency obligations

 

40,549

 

 

 

(51

)

U.S. treasury securities

 

68,704

 

 

 

(111

)

 

The following table shows the fair values and the gross unrealized losses (aggregated by investment category) of our available-for-sale securities which were in gross unrealized loss position as of January 31, 2016 (in thousands):   

 

 

 

 

 

 

Gross

 

 

Fair

 

 

Unrealized

 

 

Value

 

 

Losses

 

Asset-backed securities

$

2,249

 

 

$

(2

)

Corporate notes and bonds

 

14,296

 

 

 

(40

)

U.S. agency obligations

 

82,806

 

 

 

(54

)

U.S. treasury securities

 

33,486

 

 

 

(37

)