XML 31 R21.htm IDEA: XBRL DOCUMENT v3.22.2.2
Marketable Securities (Tables)
 9 Months Ended
Oct. 31, 2022
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, 2022, January 31, 2022 and October 31, 2021 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2022

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

85,788

 

 

$

—

 

 

$

(1,626

)

 

$

84,162

 

Municipal and pre-refunded municipal bonds

 

 

58,417

 

 

 

—

 

 

 

(910

)

 

 

57,507

 

US Treasury securities

 

 

4,750

 

 

 

—

 

 

 

(55

)

 

 

4,695

 

 

 

 

148,955

 

 

 

—

 

 

 

(2,591

)

 

 

146,364

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

61,707

 

 

 

—

 

 

 

(4,472

)

 

 

57,235

 

Municipal and pre-refunded municipal bonds

 

 

28,803

 

 

 

—

 

 

 

(1,801

)

 

 

27,002

 

Mutual funds, held in rabbi trust

 

 

12,546

 

 

 

—

 

 

 

(1,786

)

 

 

10,760

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

 

103,305

 

 

 

—

 

 

 

(8,059

)

 

 

95,246

 

 

 

$

252,260

 

 

$

—

 

 

$

(10,650

)

 

$

241,610

 

As of January 31, 2022

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

85,062

 

 

$

1

 

 

$

(200

)

 

$

84,863

 

Municipal and pre-refunded municipal bonds

 

 

128,984

 

 

 

1

 

 

 

(273

)

 

 

128,712

 

US Treasury securities

 

 

14,999

 

 

 

—

 

 

 

(38

)

 

 

14,961

 

Commercial paper

 

 

10,884

 

 

 

—

 

 

 

—

 

 

 

10,884

 

 

 

 

239,929

 

 

 

2

 

 

 

(511

)

 

 

239,420

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

148,830

 

 

 

—

 

 

 

(2,478

)

 

 

146,352

 

Municipal and pre-refunded municipal bonds

 

 

60,533

 

 

 

1

 

 

 

(912

)

 

 

59,622

 

Mutual funds, held in rabbi trust

 

 

12,419

 

 

 

—

 

 

 

(606

)

 

 

11,813

 

US Treasury securities

 

 

5,222

 

 

 

—

 

 

 

(46

)

 

 

5,176

 

Federal government agencies

 

 

350

 

 

 

—

 

 

 

(5

)

 

 

345

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

 

227,603

 

 

 

1

 

 

 

(4,047

)

 

 

223,557

 

 

 

$

467,532

 

 

$

3

 

 

$

(4,558

)

 

$

462,977

 

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2021

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

53,744

 

 

$

3

 

 

$

(71

)

 

$

53,676

 

Municipal and pre-refunded municipal bonds

 

 

114,818

 

 

 

9

 

 

 

(73

)

 

 

114,754

 

US Treasury securities

 

 

16,849

 

 

 

—

 

 

 

(3

)

 

 

16,846

 

Commercial paper

 

 

3,099

 

 

 

—

 

 

 

—

 

 

 

3,099

 

 

 

 

188,510

 

 

 

12

 

 

 

(147

)

 

 

188,375

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

174,884

 

 

 

1

 

 

 

(1,125

)

 

 

173,760

 

Municipal and pre-refunded municipal bonds

 

 

78,955

 

 

 

8

 

 

 

(362

)

 

 

78,601

 

Mutual funds, held in rabbi trust

 

 

11,540

 

 

 

542

 

 

 

(1

)

 

 

12,081

 

US Treasury securities

 

 

4,748

 

 

 

—

 

 

 

(7

)

 

 

4,741

 

Federal government agencies

 

 

350

 

 

 

—

 

 

 

(2

)

 

 

348

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

 

270,726

 

 

 

551

 

 

 

(1,497

)

 

 

269,780

 

 

 

$

459,236

 

 

$

563

 

 

$

(1,644

)

 

$

458,155