XML 41 R21.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Marketable Securities (Tables)
 9 Months Ended
Oct. 31, 2019
Investments Debt And Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities The amortized cost, gross unrealized gains (losses) and fair value of available-for-sale securities by major security type and class of security as of October 31, 2019, January 31, 2019 and October 31, 2018 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

125,040

 

 

$

310

 

 

$

(12

)

 

$

125,338

 

Municipal and pre-refunded municipal bonds

 

 

39,256

 

 

 

38

 

 

 

(14

)

 

 

39,280

 

Federal government agencies

 

 

1,622

 

 

 

4

 

 

 

—

 

 

 

1,626

 

Certificates of deposit

 

 

2,466

 

 

 

—

 

 

 

—

 

 

 

2,466

 

Commercial paper

 

 

1,987

 

 

 

—

 

 

 

—

 

 

 

1,987

 

 

 

 

170,371

 

 

 

352

 

 

 

(26

)

 

 

170,697

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

45,556

 

 

 

270

 

 

 

(26

)

 

 

45,800

 

Municipal and pre-refunded municipal bonds

 

 

20,795

 

 

 

13

 

 

 

(35

)

 

 

20,773

 

Federal government agencies

 

 

6,365

 

 

 

—

 

 

 

(15

)

 

 

6,350

 

Mutual funds, held in rabbi trust

 

 

7,661

 

 

 

144

 

 

 

(1

)

 

 

7,804

 

Certificates of deposit

 

 

2,394

 

 

 

—

 

 

 

—

 

 

 

2,394

 

 

 

 

82,771

 

 

 

427

 

 

 

(77

)

 

 

83,121

 

 

 

$

253,142

 

 

$

779

 

 

$

(103

)

 

$

253,818

 

As of January 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

227,287

 

 

$

24

 

 

$

(214

)

 

$

227,097

 

Municipal and pre-refunded municipal bonds

 

 

43,677

 

 

 

15

 

 

 

(18

)

 

 

43,674

 

Federal government agencies

 

 

1,458

 

 

 

—

 

 

 

—

 

 

 

1,458

 

Certificates of deposit

 

 

1,050

 

 

 

—

 

 

 

—

 

 

 

1,050

 

Commercial paper

 

 

2,979

 

 

 

—

 

 

 

—

 

 

 

2,979

 

Treasury bills

 

 

2,975

 

 

 

—

 

 

 

(1

)

 

 

2,974

 

 

 

 

279,426

 

 

 

39

 

 

 

(233

)

 

 

279,232

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

34,265

 

 

 

34

 

 

 

(63

)

 

 

34,236

 

Municipal and pre-refunded municipal bonds

 

 

7,554

 

 

 

7

 

 

 

(3

)

 

 

7,558

 

Federal government agencies

 

 

6,603

 

 

 

2

 

 

 

(1

)

 

 

6,604

 

Mutual funds, held in rabbi trust

 

 

6,301

 

 

 

450

 

 

 

—

 

 

 

6,751

 

Certificates of deposit

 

 

2,143

 

 

 

—

 

 

 

—

 

 

 

2,143

 

 

 

 

56,866

 

 

 

493

 

 

 

(67

)

 

 

57,292

 

 

 

$

336,292

 

 

$

532

 

 

$

(300

)

 

$

336,524

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

200,910

 

 

$

—

 

 

$

(466

)

 

$

200,444

 

Municipal and pre-refunded municipal bonds

 

 

33,291

 

 

 

—

 

 

 

(59

)

 

 

33,232

 

Certificates of deposit

 

 

755

 

 

 

—

 

 

 

—

 

 

 

755

 

Commercial paper

 

 

2,960

 

 

 

—

 

 

 

—

 

 

 

2,960

 

 

 

 

237,916

 

 

 

—

 

 

 

(525

)

 

 

237,391

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

24,793

 

 

 

—

 

 

 

(175

)

 

 

24,618

 

Municipal and pre-refunded municipal bonds

 

 

2,573

 

 

 

—

 

 

 

(7

)

 

 

2,566

 

Mutual funds, held in rabbi trust

 

 

6,932

 

 

 

—

 

 

 

(473

)

 

 

6,459

 

Certificates of deposit

 

 

2,390

 

 

 

—

 

 

 

—

 

 

 

2,390

 

 

 

 

36,688

 

 

 

—

 

 

 

(655

)

 

 

36,033

 

 

 

$

274,604

 

 

$

—

 

 

$

(1,180

)

 

$

273,424