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GOODWILL AND INTANGIBLE ASSETS (Tables)
 12 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the fiscal years ended March 31, 2018 and 2017 are as follows (in thousands):
 
 
Balance at March 31, 2016
$
1,709,369

    Goodwill attributable to the Avvasi acquisition
1,950

    Purchase accounting adjustments
3,792

    Foreign currency translation impact and other adjustments
3,051

Balance at March 31, 2017
$
1,718,162

    Goodwill attributable to the Efflux acquisition
6,077

    Foreign currency translation impact
(11,475
)
Balance as of March 31, 2018
$
1,712,764
Schedule of Intangible Assets
Intangible assets include the indefinite lived trade name with a carrying value of $18.6 million and the following amortizable intangible assets at March 31, 2018 (in thousands):
 
Cost
 
Accumulated
Amortization
 
Net
Developed technology
$
259,758

 
$
(148,937
)
 
$
110,821

Customer relationships
845,490

 
(176,425
)
 
669,065

Distributor relationships and technology licenses
9,019

 
(5,389
)
 
3,630

Definite-lived trademark and trade name
44,387

 
(18,138
)
 
26,249

Core technology
7,345

 
(6,712
)
 
633

Net beneficial leases
336

 
(336
)
 
—

Non-compete agreements
317

 
(317
)
 
—

Leasehold interest
2,600

 
(2,130
)
 
470

Backlog
18,544

 
(18,544
)
 
—

Capitalized software
3,183

 
(1,621
)
 
1,562

Other
1,247

 
(903
)
 
344

 
$
1,192,226

 
$
(379,452
)
 
$
812,774

Intangible assets include the indefinite lived trade name with a carrying value of $18.6 million and the following amortizable intangible assets at March 31, 2017 (in thousands):
 
Cost
 
Accumulated
Amortization
 
Net
Developed technology
$
254,005

 
$
(110,200
)
 
$
143,805

Customer relationships
831,731

 
(105,319
)
 
726,412

Distributor relationships and technology licenses
8,290

 
(3,068
)
 
5,222

Definite-lived trademark and trade name
43,817

 
(12,078
)
 
31,739

Core technology
7,108

 
(6,009
)
 
1,099

Net beneficial leases
336

 
(336
)
 
—

Non-compete agreements
278

 
(278
)
 
—

Leasehold interest
2,600

 
(998
)
 
1,602

Backlog
18,142

 
(18,133
)
 
9

Capitalized software
3,047

 
(594
)
 
2,453

Other
1,208

 
(880
)
 
328

 
$
1,170,562

 
$
(257,893
)
 
$
912,669
Summary of Amortization Expense
The following table provides a summary of amortization expense during the fiscal years ended March 31, 2018, 2017, and 2016 (in thousands).
 
Years Ended March 31,
 
2018
 
2017
 
2016
Amortization of intangible assets included as:
 
 
 
 
 
     Product revenue
$
9

 
$
11,438

 
$
6,747

     Cost of product revenue
40,286

 
44,326

 
45,127

     Operating expense
76,661

 
70,325

 
32,547

 
$
116,956

 
$
126,089

 
$
84,421
Schedule of Expected Future Amortization Expense
The following is the expected future amortization expense at March 31, 2018 for the fiscal years ended March 31 (in thousands):
2019
$
130,108

2020
116,494

2021
80,232

2022
69,778

2023
62,045

Thereafter
354,117

Total
$
812,774