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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 12 Months Ended
Mar. 31, 2017
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, 2016 and 2017 (in thousands):

March 31, 2016
 
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
 
$
232,600

 
$
—

 
$
—

 
$
232,600

 
$
232,600

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mutual Funds
 
10,025

 
32

 
(548
)
 
9,509

 
—

 
9,509

 
—

US Treasury Notes
 
25,051

 
21

 
(9
)
 
25,063

 
—

 
12,993

 
12,070

Subtotal
 
35,076

 
53

 
(557
)
 
34,572

 
—

 
22,502

 
12,070

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government Agency Securities
 
72,698

 
24

 
(20
)
 
72,702

 
—

 
10,521

 
62,181

Commercial Paper
 
37,628

 
—

 
—

 
37,628

 
650

 
36,978

 
—

Corporate Bonds
 
147,662

 
234

 
(97
)
 
147,799

 
2,016

 
77,115

 
68,668

Certificates of Deposits ("CDs")
 
15,639

 
—

 
—

 
15,639

 
—

 
12,935

 
2,704

Subtotal
 
273,627

 
258

 
(117
)
 
273,768

 
2,666

 
137,549

 
133,553

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents
and investments measured at fair value
 
$
541,303

 
$
311

 
$
(674
)
 
$
540,940

 
$
235,266

 
$
160,051

 
$
145,623



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