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CASH, CASH EQUIVALENTS, AND INVESTMENTS (Tables)
 3 Months Ended
Jun. 30, 2017
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]  
Cash, Cash Equivalents, and Investments
The following tables summarize the Company’s cash and available-for-sale securities’ 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 June 30, 2017 and March 31, 2017 (in thousands):
June 30, 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
 
$
283,289

 
$
—

 
$
—

 
$
283,289

 
$
283,289

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mutual Funds
 
13,143

 
436

 
(27
)
 
13,552

 
—

 
13,552

 
—

US Treasury Notes
 
38,914

 
—

 
(78
)
 
38,836

 
—

 
20,417

 
18,419

Subtotal
 
52,057

 
436

 
(105
)
 
52,388

 
—

 
33,969

 
18,419

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government Agency Securities
 
52,412

 
—

 
(172
)
 
52,240

 
—

 
31,739

 
20,501

Commercial Paper
 
47,642

 
—

 
—

 
47,642

 
7,195

 
40,447

 
—

Corporate Bonds
 
145,498

 
97

 
(148
)
 
145,447

 
—

 
73,493

 
71,954

Certificates of Deposits ("CDs")
 
18,551

 
9

 
—

 
18,560

 
—

 
17,344

 
1,216

Subtotal
 
264,103

 
106

 
(320
)
 
263,889

 
7,195

 
163,023

 
93,671

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents
and investments measured at fair value
 
$
599,449

 
$
542

 
$
(425
)
 
$
599,566

 
$
290,484

 
$
196,992

 
$
112,090


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