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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 12 Months Ended
Mar. 31, 2018
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents and Investments
The following tables summarize the Company’s cash, cash equivalents, and investments’ adjusted cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of March 31, 2017 and 2018 (in thousands):

March 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Cash & Cash Equivalents
 
Short-term investments (due in 1 year or less)
 
Long-term investments (due in 1 to 3 years)
Cash
 
$
295,877

 
$
—

 
$
—

 
$
295,877

 
$
295,877

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mutual Funds
 
12,079

 
352

 
(32
)
 
12,399

 
—

 
12,399

 
—

US Treasury Notes
 
35,960

 
—

 
(68
)
 
35,892

 
—

 
17,560

 
18,332

Subtotal
 
48,039

 
352

 
(100
)
 
48,291

 
—

 
29,959

 
18,332

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government Agency Securities
 
54,415

 
20

 
(164
)
 
54,271

 
—

 
15,309

 
38,962

Commercial Paper
 
47,152

 
—

 
—

 
47,152

 
6,093

 
41,059

 
—

Corporate Bonds
 
141,508

 
64

 
(224
)
 
141,348

 
—

 
73,676

 
67,672

Certificates of Deposits ("CDs")
 
20,383

 
3

 
—

 
20,386

 
—

 
18,176

 
2,210

Subtotal
 
263,458

 
87

 
(388
)
 
263,157

 
6,093

 
148,220

 
108,844

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents
and investments measured at fair value
 
$
607,374

 
$
439

 
$
(488
)
 
$
607,325

 
$
301,970

 
$
178,179

 
$
127,176



March 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Cash & Cash Equivalents
 
Short-term investments (due in 1 year or less)
 
Long-term investments (due in 1 to 3 years)
Cash
 
$
308,734

 
$
—

 
$
—

 
$
308,734

 
$
308,734

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mutual Funds
 
13,336

 
186

 
(67
)
 
13,455

 
—

 
13,455

 
—

US Treasury Notes
 
129,373

 
7

 
(60
)
 
129,320

 
30,178

 
99,142

 
—

Money Market Funds
 
344

 
—

 
—

 
344

 
344

 
—

 
—

Subtotal
 
143,053

 
193

 
(127
)
 
143,119

 
30,522

 
112,597

 
—

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government Agency Securities
 
46,354

 
—

 
(56
)
 
46,298

 
6,978

 
39,320

 
—

Municipal Bonds
 
3,591

 
—

 
—

 
3,591

 
3,591

 
—

 
—

Commercial Paper
 
84,512

 
—

 
—

 
84,512

 
40,836

 
43,676

 
—

Corporate Bonds
 
54,701

 
—

 
(212
)
 
54,489

 
—

 
54,489

 
—

Certificates of Deposits ("CDs")
 
19,231

 
—

 
—

 
19,231

 
—

 
19,231

 
—

Subtotal
 
208,389

 
—

 
(268
)
 
208,121

 
51,405

 
156,716

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents
and investments measured at fair value
 
$
660,176

 
$
193

 
$
(395
)
 
$
659,974

 
$
390,661

 
$
269,313

 
$
—