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CASH, CASH EQUIVALENTS, AND INVESTMENTS (Tables)
 9 Months Ended
Dec. 31, 2016
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 December 31, 2016 and March 31, 2016 (in thousands):
December 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
 
$
242,461

 
$
—

 
$
—

 
$
242,461

 
$
242,461

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mutual Funds
 
11,970

 
177

 
(97
)
 
12,050

 
—

 
12,050

 
—

US Treasury Notes
 
25,610

 
—

 
(41
)
 
25,569

 
—

 
13,519

 
12,050

Subtotal
 
37,580

 
177

 
(138
)
 
37,619

 
—

 
25,569

 
12,050

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government Agency Securities
 
59,332

 
6

 
(144
)
 
59,194

 
—

 
15,226

 
43,968

Commercial Paper
 
49,904

 
—

 
—

 
49,904

 
—

 
49,904

 
—

Corporate Bonds
 
144,291

 
8

 
(269
)
 
144,030

 
—

 
68,804

 
75,226

Certificates of Deposits ("CDs")
 
21,646

 
—

 
—

 
21,646

 
—

 
17,939

 
3,707

Subtotal
 
275,173

 
14

 
(413
)
 
274,774

 
—

 
151,873

 
122,901

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total cash, cash equivalents
and investments measured at fair value
 
$
555,214

 
$
191

 
$
(551
)
 
$
554,854

 
$
242,461

 
$
177,442

 
$
134,951


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