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Investments (Tables)
9 Months Ended
Oct. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
At October 31, 2017, marketable securities consisted of the following (in thousands):
Investments classified as Marketable Securities
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
Corporate notes and obligations
$
939,959

 
$
2,246

 
$
(2,435
)
 
$
939,770

U.S. treasury securities
137,172

 
29

 
(491
)
 
136,710

Mortgage backed obligations
98,226

 
22

 
(532
)
 
97,716

Asset backed securities
202,180

 
96

 
(219
)
 
202,057

Municipal securities
56,387

 
81

 
(201
)
 
56,267

Foreign government obligations
68,845

 
2

 
(524
)
 
68,323

U.S. agency obligations
10,506

 
1

 
(9
)
 
10,498

Covered bonds
45,485

 
63

 
(61
)
 
45,487

Total marketable securities
$
1,558,760


$
2,540


$
(4,472
)

$
1,556,828

At January 31, 2017, marketable securities consisted of the following (in thousands):
Investments classified as Marketable Securities
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
Corporate notes and obligations
$
321,284

 
$
887

 
$
(1,531
)
 
$
320,640

U.S. treasury securities
62,429

 
68

 
(674
)
 
61,823

Mortgage backed obligations
74,882

 
39

 
(669
)
 
74,252

Asset backed securities
101,913

 
74

 
(197
)
 
101,790

Municipal securities
33,523

 
35

 
(183
)
 
33,375

Foreign government obligations
10,491

 
3

 
(36
)
 
10,458

Total marketable securities
$
604,522


$
1,106


$
(3,290
)

$
602,338

Schedule of Short-Term and Long-Term Marketable Securities
The contractual maturities of the investments classified as marketable securities are as follows (in thousands):
 
As of
 
October 31,
2017
 
January 31,
2017
Due within 1 year
$
226,929

 
$
104,631

Due in 1 year through 5 years
1,314,352

 
494,127

Due in 5 years through 10 years
15,547

 
3,580

 
$
1,556,828

 
$
602,338

Schedule of Marketable Securities in a Unrealized Loss Position
As of October 31, 2017, the following marketable securities were in an unrealized loss position (in thousands):
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Corporate notes and obligations
$
424,101

 
$
(2,052
)
 
$
28,653

 
$
(383
)
 
$
452,754

 
$
(2,435
)
U.S. treasury securities
114,724

 
(491
)
 
0

 
0

 
114,724

 
(491
)
Mortgage backed obligations
68,841

 
(315
)
 
16,564

 
(217
)
 
85,405

 
(532
)
Asset backed securities
126,186

 
(210
)
 
3,461

 
(9
)
 
129,647

 
(219
)
Municipal securities
30,671

 
(148
)
 
2,788

 
(53
)
 
33,459

 
(201
)
Foreign government obligations
62,697

 
(520
)
 
1,027

 
(4
)
 
63,724

 
(524
)
U.S. agency obligations
6,746

 
(9
)
 
0

 
0

 
6,746

 
(9
)
Covered bonds
5,861

 
(61
)
 
0

 
0

 
5,861

 
(61
)
 
$
839,827

 
$
(3,806
)
 
$
52,493

 
$
(666
)
 
$
892,320

 
$
(4,472
)
Schedule of Components of Investment Income
The components of investment income are presented below (in thousands):
 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2017
 
2016
 
2017
 
2016
Interest income
$
10,038

 
$
3,642

 
$
24,433

 
$
17,961

Realized gains
258

 
210

 
770

 
7,771

Realized losses
(247
)
 
(143
)
 
(1,134
)
 
(1,985
)
Total investment income
$
10,049

 
$
3,709

 
$
24,069

 
$
23,747