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GOODWILL AND INTANGIBLE ASSETS (Tables)
 6 Months Ended
Sep. 30, 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 six months ended September 30, 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
4,612

Balance at September 30, 2018
$
1,712,962
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 September 30, 2018 (in thousands):

Cost

Accumulated
Amortization

Net
Developed technology
$
243,093

 
$
(153,856
)
 
$
89,237

Customer relationships
775,868

 
(188,347
)
 
587,521

Distributor relationships and technology licenses
6,931

 
(4,571
)
 
2,360

Definite-lived trademark and trade name
39,430

 
(18,016
)
 
21,414

Core technology
7,252

 
(6,761
)
 
491

Net beneficial leases
336

 
(336
)
 
—

Non-compete agreements
301

 
(301
)
 
—

Leasehold interest
500

 
(500
)
 
—

Backlog
16,486

 
(16,486
)
 
—

Capitalized software
3,183

 
(2,152
)
 
1,031

Other
1,208

 
(913
)
 
295

 
$
1,094,588

 
$
(392,239
)
 
$
702,349

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 six months ended September 30, 2018 and 2017, respectively (in thousands):
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Amortization of intangible assets included as:
 
 
 
 
 
 
 
    Product revenue
$
—

 
$
2

 
$
—

 
$
4

    Cost of product revenue
8,491

 
10,129

 
17,682

 
19,943

    Operating expense
17,986

 
18,303

 
41,456

 
36,692

 
$
26,477

 
$
28,434

 
$
59,138

 
$
56,639
Schedule of Expected Future Amortization Expense
The following is the expected future amortization expense at September 30, 2018 for the fiscal years ending March 31 (in thousands):
2019 (remaining six months)
$
49,372

2020
91,165

2021
79,860

2022
69,437

2023
61,733

Thereafter
350,782


$
702,349