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Marketable Securities (Tables)
 3 Months Ended
Apr. 30, 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 April 30, 2020, January 31, 2020 and April 30, 2019 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of April 30, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

$

50,887

 

 

$

5

 

 

$

(31

)

 

$

50,861

 

Corporate bonds

 

 

14,246

 

 

 

21

 

 

 

(7

)

 

 

14,260

 

 

 

 

65,133

 

 

 

26

 

 

 

(38

)

 

 

65,121

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

 

2,350

 

 

 

21

 

 

 

(1

)

 

 

2,370

 

Corporate bonds

 

 

2,572

 

 

 

3

 

 

 

(4

)

 

 

2,571

 

Mutual funds, held in rabbi trust

 

 

7,400

 

 

 

682

 

 

 

—

 

 

 

8,082

 

Certificates of deposit

 

 

249

 

 

 

—

 

 

 

—

 

 

 

249

 

 

 

 

12,571

 

 

 

706

 

 

 

(5

)

 

 

13,272

 

 

 

$

77,704

 

 

$

732

 

 

$

(43

)

 

$

78,393

 

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

 

Federal government agencies

 

 

1,152

 

 

 

3

 

 

 

—

 

 

 

1,155

 

Certificates of deposit

 

 

2,593

 

 

 

—

 

 

 

—

 

 

 

2,593

 

Commercial paper

 

 

1,997

 

 

 

—

 

 

 

—

 

 

 

1,997

 

 

 

 

211,149

 

 

 

341

 

 

 

(37

)

 

 

211,453

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

 

30,340

 

 

 

35

 

 

 

(17

)

 

 

30,358

 

Corporate bonds

 

 

47,352

 

 

 

205

 

 

 

(40

)

 

 

47,517

 

Mutual funds, held in rabbi trust

 

 

8,448

 

 

 

36

 

 

 

(55

)

 

 

8,429

 

Federal government agencies

 

 

6,926

 

 

 

1

 

 

 

(2

)

 

 

6,925

 

Certificates of deposit

 

 

3,867

 

 

 

—

 

 

 

—

 

 

 

3,867

 

 

 

 

96,933

 

 

 

277

 

 

 

(114

)

 

 

97,096

 

 

 

$

308,082

 

 

$

618

 

 

$

(151

)

 

$

308,549

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of April 30, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

$

52,131

 

 

$

23

 

 

$

(6

)

 

$

52,148

 

Corporate bonds

 

 

169,627

 

 

 

72

 

 

 

(70

)

 

 

169,629

 

Federal government agencies

 

 

2,735

 

 

 

4

 

 

 

—

 

 

 

2,739

 

Certificates of deposit

 

 

1,650

 

 

 

—

 

 

 

—

 

 

 

1,650

 

Commercial paper

 

 

2,997

 

 

 

—

 

 

 

—

 

 

 

2,997

 

 

 

 

229,140

 

 

 

99

 

 

 

(76

)

 

 

229,163

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal and pre-refunded municipal bonds

 

 

11,035

 

 

 

11

 

 

 

(8

)

 

 

11,038

 

Corporate bonds

 

 

71,105

 

 

 

95

 

 

 

(46

)

 

 

71,154

 

Mutual funds, held in rabbi trust

 

 

7,733

 

 

 

208

 

 

 

 

 

 

 

7,941

 

Federal government agencies

 

 

2,351

 

 

 

7

 

 

 

—

 

 

 

2,358

 

Certificates of deposit

 

 

1,403

 

 

 

—

 

 

 

—

 

 

 

1,403

 

 

 

 

93,627

 

 

 

321

 

 

 

(54

)

 

 

93,894

 

 

 

$

322,767

 

 

$

420

 

 

$

(130

)

 

$

323,057