XML 30 R20.htm IDEA: XBRL DOCUMENT v3.23.1
Marketable Securities (Tables)
 3 Months Ended
Apr. 30, 2023
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 April 30, 2023, January 31, 2023 and April 30, 2022 were as follows:

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of April 30, 2023

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

86,052

 

 

$

1

 

 

$

(1,214

)

 

$

84,839

 

Municipal and pre-refunded municipal bonds

 

 

45,467

 

 

 

—

 

 

 

(547

)

 

 

44,920

 

Commercial paper

 

 

35,874

 

 

 

—

 

 

 

—

 

 

 

35,874

 

US Treasury securities

 

 

22,903

 

 

 

1

 

 

 

(16

)

 

 

22,888

 

Federal government agencies

 

 

21,284

 

 

 

—

 

 

 

(28

)

 

 

21,256

 

 

 

211,580

 

 

 

2

 

 

 

(1,805

)

 

 

209,777

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

42,823

 

 

 

17

 

 

 

(2,141

)

 

 

40,699

 

Municipal and pre-refunded municipal bonds

 

 

19,071

 

 

 

5

 

 

 

(906

)

 

 

18,170

 

Federal government agencies

 

 

14,340

 

 

 

9

 

 

 

(37

)

 

 

14,312

 

Mutual funds, held in rabbi trust

 

 

12,656

 

 

 

132

 

 

 

(62

)

 

 

12,726

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

89,139

 

 

 

163

 

 

 

(3,146

)

 

 

86,156

 

 

$

300,719

 

 

$

165

 

 

$

(4,951

)

 

$

295,933

 

As of January 31, 2023

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

83,184

 

 

$

—

 

 

$

(947

)

 

$

82,237

 

Municipal and pre-refunded municipal bonds

 

 

48,141

 

 

 

—

 

 

 

(688

)

 

 

47,453

 

Commercial paper

 

 

21,636

 

 

 

—

 

 

 

—

 

 

 

21,636

 

US Treasury securities

 

 

23,561

 

 

 

1

 

 

 

(10

)

 

 

23,552

 

Federal government agencies

 

 

6,501

 

 

 

—

 

 

 

(1

)

 

 

6,500

 

 

 

183,023

 

 

 

1

 

 

 

(1,646

)

 

 

181,378

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

62,594

 

 

 

22

 

 

 

(3,319

)

 

 

59,297

 

Municipal and pre-refunded municipal bonds

 

 

23,437

 

 

 

5

 

 

 

(1,154

)

 

 

22,288

 

Federal government agencies

 

 

9,021

 

 

 

13

 

 

 

(2

)

 

 

9,032

 

Mutual funds, held in rabbi trust

 

 

13,402

 

 

 

—

 

 

 

(1,424

)

 

 

11,978

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

108,703

 

 

 

40

 

 

 

(5,899

)

 

 

102,844

 

 

$

291,726

 

 

$

41

 

 

$

(7,545

)

 

$

284,222

 

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of April 30, 2022

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

85,474

 

 

$

—

 

 

$

(857

)

 

$

84,617

 

Municipal and pre-refunded municipal bonds

 

 

86,134

 

 

 

—

 

 

 

(633

)

 

 

85,501

 

Commercial paper

 

 

7,789

 

 

 

—

 

 

 

—

 

 

 

7,789

 

US Treasury securities

 

 

9,749

 

 

 

—

 

 

 

(93

)

 

 

9,656

 

 

 

189,146

 

 

 

—

 

 

 

(1,583

)

 

 

187,563

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

117,403

 

 

 

—

 

 

 

(4,904

)

 

 

112,499

 

Municipal and pre-refunded municipal bonds

 

 

53,928

 

 

 

—

 

 

 

(2,081

)

 

 

51,847

 

Federal government agencies

 

 

350

 

 

 

—

 

 

 

(12

)

 

 

338

 

US Treasury securities

 

 

3,226

 

 

 

—

 

 

 

(138

)

 

 

3,088

 

Mutual funds, held in rabbi trust

 

 

12,393

 

 

 

—

 

 

 

(956

)

 

 

11,437

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

187,549

 

 

 

—

 

 

 

(8,091

)

 

 

179,458

 

 

$

376,695

 

 

$

—

 

 

$

(9,674

)

 

$

367,021