XML 33 R22.htm IDEA: XBRL DOCUMENT v3.20.2
Marketable Securities (Tables)
 9 Months Ended
Oct. 31, 2020
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, 2020, January 31, 2020 and October 31, 2019 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

2

 

 

$

—

 

 

$

—

 

 

$

2

 

 

 

 

2

 

 

 

—

 

 

 

—

 

 

 

2

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mutual funds, held in rabbi trust

 

 

9,393

 

 

 

17

 

 

 

(144

)

 

 

9,266

 

Municipal and pre-refunded municipal bonds

 

 

53

 

 

 

1

 

 

 

—

 

 

 

54

 

Corporate bonds

 

 

30

 

 

 

—

 

 

 

—

 

 

 

30

 

 

 

 

9,476

 

 

 

18

 

 

 

(144

)

 

 

9,350

 

 

 

$

9,478

 

 

$

18

 

 

$

(144

)

 

$

9,352

 

As of January 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

$

38,617

 

 

$

20

 

 

$

(11

)

 

$

38,626

 

Corporate bonds

 

 

166,790

 

 

 

318

 

 

 

(26

)

 

 

167,082

 

Certificates of deposit

 

 

2,593

 

 

 

—

 

 

 

—

 

 

 

2,593

 

Federal government agencies

 

 

1,152

 

 

 

3

 

 

 

—

 

 

 

1,155

 

Commercial paper

 

 

1,997

 

 

 

—

 

 

 

—

 

 

 

1,997

 

 

 

 

211,149

 

 

 

341

 

 

 

(37

)

 

 

211,453

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mutual funds, held in rabbi trust

 

 

8,448

 

 

 

36

 

 

 

(55

)

 

 

8,429

 

Municipal and pre-refunded municipal bonds

 

 

30,340

 

 

 

35

 

 

 

(17

)

 

 

30,358

 

Corporate bonds

 

 

47,352

 

 

 

205

 

 

 

(40

)

 

 

47,517

 

Certificates of deposit

 

 

3,867

 

 

 

—

 

 

 

—

 

 

 

3,867

 

Federal government agencies

 

 

6,926

 

 

 

1

 

 

 

(2

)

 

 

6,925

 

 

 

 

96,933

 

 

 

277

 

 

 

(114

)

 

 

97,096

 

 

 

$

308,082

 

 

$

618

 

 

$

(151

)

 

$

308,549

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

$

39,256

 

 

$

38

 

 

$

(14

)

 

$

39,280

 

Corporate bonds

 

 

125,040

 

 

 

310

 

 

 

(12

)

 

 

125,338

 

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:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mutual funds, held in rabbi trust

 

 

7,661

 

 

 

144

 

 

 

(1

)

 

 

7,804

 

Municipal and pre-refunded municipal bonds

 

 

20,795

 

 

 

13

 

 

 

(35

)

 

 

20,773

 

Corporate bonds

 

 

45,556

 

 

 

270

 

 

 

(26

)

 

 

45,800

 

Federal government agencies

 

 

6,365

 

 

 

—

 

 

 

(15

)

 

 

6,350

 

Certificates of deposit

 

 

2,394

 

 

 

—

 

 

 

—

 

 

 

2,394

 

 

 

 

82,771

 

 

 

427

 

 

 

(77

)

 

 

83,121

 

 

 

$

253,142

 

 

$

779

 

 

$

(103

)

 

$

253,818