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Marketable Securities
 9 Months Ended
Oct. 31, 2018
Investments Debt And Equity Securities [Abstract]  
Marketable Securities

4. Marketable Securities

During all periods shown, marketable securities are classified as available-for-sale. 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, 2018, January 31, 2018 and October 31, 2017 were as follows:

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Fair

 

 

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Value

 

As of October 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

200,910

 

 

$

—

 

 

$

(466

)

 

$

200,444

 

Municipal and pre-refunded municipal bonds

 

 

33,291

 

 

 

—

 

 

 

(59

)

 

 

33,232

 

Certificates of deposit

 

 

755

 

 

 

—

 

 

 

—

 

 

 

755

 

Commercial paper

 

 

2,960

 

 

 

—

 

 

 

—

 

 

 

2,960

 

 

 

 

237,916

 

 

 

—

 

 

 

(525

)

 

 

237,391

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

24,793

 

 

 

—

 

 

 

(175

)

 

 

24,618

 

Municipal and pre-refunded municipal bonds

 

 

2,573

 

 

 

—

 

 

 

(7

)

 

 

2,566

 

Mutual funds, held in rabbi trust

 

 

6,932

 

 

 

—

 

 

 

(473

)

 

 

6,459

 

Certificates of deposit

 

 

2,390

 

 

 

—

 

 

 

—

 

 

 

2,390

 

 

 

 

36,688

 

 

 

—

 

 

 

(655

)

 

 

36,033

 

 

 

$

274,604

 

 

$

—

 

 

$

(1,180

)

 

$

273,424

 

As of January 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

111,612

 

 

$

—

 

 

$

(184

)

 

$

111,428

 

Municipal and pre-refunded municipal bonds

 

 

52,474

 

 

 

11

 

 

 

(39

)

 

 

52,446

 

Certificates of deposit

 

 

1,251

 

 

 

—

 

 

 

—

 

 

 

1,251

 

 

 

 

165,337

 

 

 

11

 

 

 

(223

)

 

 

165,125

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

39,853

 

 

 

—

 

 

 

(228

)

 

 

39,625

 

Municipal and pre-refunded municipal bonds

 

 

9,873

 

 

 

8

 

 

 

(24

)

 

 

9,857

 

Mutual funds, held in rabbi trust

 

 

5,973

 

 

 

274

 

 

 

(10

)

 

 

6,237

 

Certificates of deposit

 

 

2,969

 

 

 

—

 

 

 

—

 

 

 

2,969

 

 

 

 

58,668

 

 

 

282

 

 

 

(262

)

 

 

58,688

 

 

 

$

224,005

 

 

$

293

 

 

$

(485

)

 

$

223,813

 

As of October 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

67,275

 

 

$

2

 

 

$

(71

)

 

$

67,206

 

Municipal and pre-refunded municipal bonds

 

 

24,676

 

 

 

4

 

 

 

(14

)

 

 

24,666

 

Certificates of deposit

 

 

1,356

 

 

 

—

 

 

 

—

 

 

 

1,356

 

 

 

 

93,307

 

 

 

6

 

 

 

(85

)

 

 

93,228

 

Long-term Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

 

30,051

 

 

 

2

 

 

 

(87

)

 

 

29,966

 

Municipal and pre-refunded municipal bonds

 

 

1,362

 

 

 

—

 

 

 

(2

)

 

 

1,360

 

Mutual funds, held in rabbi trust

 

 

5,639

 

 

 

109

 

 

 

(2

)

 

 

5,746

 

Certificates of deposit

 

 

4,182

 

 

 

—

 

 

 

—

 

 

 

4,182

 

 

 

 

41,234

 

 

 

111

 

 

 

(91

)

 

 

41,254

 

 

 

$

134,541

 

 

$

117

 

 

$

(176

)

 

$

134,482

 

 

Proceeds from the sales and maturities of available-for-sale securities were $211,174 and $209,937 for the nine months ended October 31, 2018 and 2017, respectively. The Company included in “Other income (expense), net,” in the Condensed Consolidated Statements of Income, net realized losses of $3 and $16 for the three and nine months ended October 31, 2018, respectively, and net realized losses of $2 and $11 for the three and nine months ended October 31, 2017, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other income (expense), net” of $328 and $1,479 for the three and nine months ended October 31, 2018, respectively, and $538 and $2,066 for the three and nine months ended October 31, 2017, respectively. Mutual funds represent assets held in an irrevocable rabbi trust for the Company’s Non-qualified Deferred Compensation Plan (“NQDC”). These assets are a source of funds to match the funding obligations to participants in the NQDC but are subject to the Company’s general creditors. The Company elected the fair value option for financial assets for the mutual funds held in the rabbi trust resulting in all unrealized gains and losses being recorded in “Other income (expense), net” in the Condensed Consolidated Statements of Income.