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GOODWILL & INTANGIBLE ASSETS (Tables)
 12 Months Ended
Mar. 31, 2019
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, 2019 and 2018 are as follows (in thousands):
 
 
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

    Divestiture of the HNT tools business
(4,414
)
    Foreign currency translation impact
7,135

Balance as of March 31, 2019
$
1,715,485
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, 2019 (in thousands):
 
Cost
 
Accumulated
Amortization
 
Net
Developed technology
$
242,259

 
$
(168,289
)
 
$
73,970

Customer relationships
772,969

 
(218,043
)
 
554,926

Distributor relationships and technology licenses
6,882

 
(5,237
)
 
1,645

Definite-lived trademark and trade name
39,304

 
(20,586
)
 
18,718

Core technology
7,192

 
(6,845
)
 
347

Net beneficial leases
336

 
(336
)
 
—

Non-compete agreements
292

 
(292
)
 
—

Leasehold interest
500

 
(500
)
 
—

Backlog
16,397

 
(16,397
)
 
—

Capitalized software
3,317

 
(2,690
)
 
627

Other
1,208

 
(923
)
 
285

 
$
1,090,656

 
$
(440,138
)
 
$
650,518

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
Summary of Amortization Expense
The following table provides a summary of amortization expense during the fiscal years ended March 31, 2019, 2018, and 2017 (in thousands).
 
Years Ended March 31,
 
2019
 
2018
 
2017
Amortization of intangible assets included as:
 
 
 
 
 
     Product revenue
$
—

 
$
9

 
$
11,438

     Cost of product revenue
34,039

 
40,286

 
44,326

     Operating expense
74,325

 
76,661

 
70,325

 
$
108,364

 
$
116,956

 
$
126,089
Schedule of Expected Future Amortization Expense
The following is the expected future amortization expense at March 31, 2019 for the fiscal years ended March 31 (in thousands):
2020
$
90,924

2021
79,643

2022
69,232

2023
61,511

2024
53,403

Thereafter
295,805

Total
$
650,518