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GOODWILL AND INTANGIBLE ASSETS (Tables)
9 Months Ended
Dec. 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 nine months ended December 31, 2018 are as follows (in thousands):
Balance at March 31, 2018
$
1,712,764

Divestiture of the HNT tools business
(4,414
)
Foreign currency translation impact
7,173

Balance at December 31, 2018
$
1,715,523

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 December 31, 2018 (in thousands):

Cost

Accumulated
Amortization

Net
Developed technology
$
242,270

 
$
(160,816
)
 
$
81,454

Customer relationships
773,004

 
(202,940
)
 
570,064

Distributor relationships and technology licenses
6,882

 
(4,880
)
 
2,002

Definite-lived trademark and trade name
39,303

 
(19,267
)
 
20,036

Core technology
7,200

 
(6,781
)
 
419

Net beneficial leases
336

 
(336
)
 

Non-compete agreements
293

 
(293
)
 

Leasehold interest
500

 
(500
)
 

Backlog
16,383

 
(16,383
)
 

Capitalized software
3,315

 
(2,417
)
 
898

Other
1,208

 
(918
)
 
290

 
$
1,090,694

 
$
(415,531
)
 
$
675,163

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

Finite-lived Intangible Assets Amortization Expense
The following table provides a summary of amortization expense for the three and nine months ended December 31, 2018 and 2017, respectively (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
December 31,
 
December 31,
 
2018
 
2017
 
2018
 
2017
Amortization of intangible assets included as:
 
 
 
 
 
 
 
    Product revenue
$

 
$
3

 
$

 
$
7

    Cost of product revenue
8,176

 
10,088

 
25,858

 
30,032

    Operating expense
16,438

 
18,227

 
57,894

 
54,919

 
$
24,614

 
$
28,318

 
$
83,752

 
$
84,958

Schedule of Expected Future Amortization Expense
The following is the expected future amortization expense at December 31, 2018 for the fiscal years ending March 31 (in thousands):
2019 (remaining three months)
$
24,619

2020
90,926

2021
79,645

2022
69,234

2023
61,515

Thereafter
349,224


$
675,163