XML 33 R21.htm IDEA: XBRL DOCUMENT v3.22.2.2
Marketable Securities (Tables)
 6 Months Ended
Jul. 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 July 31, 2022, January 31, 2022 and July 31, 2021 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of July 31, 2022

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

76,652

 

 

$

—

 

 

$

(1,211

)

 

$

75,441

 

Municipal and pre-refunded municipal bonds

 

 

75,518

 

 

 

—

 

 

 

(595

)

 

 

74,923

 

US Treasury securities

 

 

9,749

 

 

 

—

 

 

 

(93

)

 

 

9,656

 

 

 

 

161,919

 

 

 

—

 

 

 

(1,899

)

 

 

160,020

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

96,086

 

 

 

—

 

 

 

(4,160

)

 

 

91,926

 

Municipal and pre-refunded municipal bonds

 

 

47,437

 

 

 

—

 

 

 

(1,858

)

 

 

45,579

 

US Treasury securities

 

 

3,229

 

 

 

—

 

 

 

(129

)

 

 

3,100

 

Mutual funds, held in rabbi trust

 

 

12,361

 

 

 

—

 

 

 

(1,025

)

 

 

11,336

 

Federal government agencies

 

 

350

 

 

 

—

 

 

 

(12

)

 

 

338

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

 

159,712

 

 

 

—

 

 

 

(7,184

)

 

 

152,528

 

 

 

$

321,631

 

 

$

—

 

 

$

(9,083

)

 

$

312,548

 

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

 

US Treasury securities

 

 

5,222

 

 

 

—

 

 

 

(46

)

 

 

5,176

 

Mutual funds, held in rabbi trust

 

 

12,419

 

 

 

—

 

 

 

(606

)

 

 

11,813

 

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 July 31, 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

28,808

 

 

$

2

 

 

$

(24

)

 

$

28,786

 

Municipal and pre-refunded municipal bonds

 

 

122,173

 

 

 

14

 

 

 

(87

)

 

 

122,100

 

Commercial paper

 

 

6,096

 

 

 

—

 

 

 

—

 

 

 

6,096

 

 

 

 

157,077

 

 

 

16

 

 

 

(111

)

 

 

156,982

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

61,646

 

 

 

4

 

 

 

(159

)

 

 

61,491

 

Municipal and pre-refunded municipal bonds

 

 

40,069

 

 

 

34

 

 

 

(56

)

 

 

40,047

 

Mutual funds, held in rabbi trust

 

 

11,610

 

 

 

143

 

 

 

(42

)

 

 

11,711

 

 

 

 

113,325

 

 

 

181

 

 

 

(257

)

 

 

113,249

 

 

 

$

270,402

 

 

$

197

 

 

$

(368

)

 

$

270,231