XML 34 R22.htm IDEA: XBRL DOCUMENT v3.20.2
Marketable Securities (Tables)
 6 Months Ended
Jul. 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 July 31, 2020, January 31, 2020 and July 31, 2019 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of July 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

291

 

 

$

—

 

 

$

—

 

 

$

291

 

Municipal and pre-refunded municipal bonds

 

 

210

 

 

 

—

 

 

 

—

 

 

 

210

 

 

 

 

501

 

 

 

—

 

 

 

—

 

 

 

501

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mutual funds, held in rabbi trust

 

 

8,767

 

 

 

365

 

 

 

—

 

 

 

9,132

 

Corporate bonds

 

 

30

 

 

 

—

 

 

 

—

 

 

 

30

 

Municipal and pre-refunded municipal bonds

 

 

53

 

 

 

1

 

 

 

—

 

 

 

54

 

 

 

 

8,850

 

 

 

366

 

 

 

—

 

 

 

9,216

 

 

 

$

9,351

 

 

$

366

 

 

$

—

 

 

$

9,717

 

As of January 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

166,790

 

 

$

318

 

 

$

(26

)

 

$

167,082

 

Municipal and pre-refunded municipal bonds

 

 

38,617

 

 

 

20

 

 

 

(11

)

 

 

38,626

 

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

 

Corporate bonds

 

 

47,352

 

 

 

205

 

 

 

(40

)

 

 

47,517

 

Municipal and pre-refunded municipal bonds

 

 

30,340

 

 

 

35

 

 

 

(17

)

 

 

30,358

 

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 July 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

125,943

 

 

$

190

 

 

$

(31

)

 

$

126,102

 

Municipal and pre-refunded municipal bonds

 

 

42,023

 

 

 

40

 

 

 

(9

)

 

 

42,054

 

Certificates of deposit

 

 

1,745

 

 

 

—

 

 

 

—

 

 

 

1,745

 

Federal government agencies

 

 

1,495

 

 

 

2

 

 

 

—

 

 

 

1,497

 

 

 

 

171,206

 

 

 

232

 

 

 

(40

)

 

 

171,398

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mutual funds, held in rabbi trust

 

 

7,826

 

 

 

56

 

 

 

(7

)

 

 

7,875

 

Corporate bonds

 

 

49,385

 

 

 

174

 

 

 

(33

)

 

 

49,526

 

Municipal and pre-refunded municipal bonds

 

 

19,526

 

 

 

6

 

 

 

(50

)

 

 

19,482

 

Certificates of deposit

 

 

1,847

 

 

 

—

 

 

 

—

 

 

 

1,847

 

Federal government agencies

 

 

126

 

 

 

1

 

 

 

—

 

 

 

127

 

 

 

 

78,710

 

 

 

237

 

 

 

(90

)

 

 

78,857

 

 

 

$

249,916

 

 

$

469

 

 

$

(130

)

 

$

250,255