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Intangible Assets and Goodwill (Tables)
 12 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible assets consist of the following (amounts in thousands):
 
 
March 31, 2015
 
 
Gross Amount
 
Accumulated Amortization
 
Net Amount
Developed technology
 
$
569,942

 
$
(209,676
)
 
$
360,266

Customer-related
 
263,969

 
(193,483
)
 
70,486

Trademarks and trade names
 
15,730

 
(9,529
)
 
6,201

Backlog
 
26,304

 
(26,304
)
 
—

In-process technology
 
67,142

 
—

 
67,142

Distribution rights
 
5,580

 
(5,258
)
 
322

Covenants not to compete
 
400

 
(400
)
 
—

 
 
$
949,067

 
$
(444,650
)
 
$
504,417


 
 
March 31, 2014
 
 
Gross Amount
 
Accumulated Amortization
 
Net Amount
Developed technology
 
$
402,669

 
$
(117,222
)
 
$
285,447

Customer-related
 
195,800

 
(109,170
)
 
86,630

Trademarks and trade names
 
15,730

 
(7,118
)
 
8,612

Backlog
 
24,610

 
(24,610
)
 
—

In-process technology
 
64,396

 
—

 
64,396

Distribution rights
 
5,585

 
(5,171
)
 
414

Covenants not to compete
 
400

 
(400
)
 
—

 
 
$
709,190

 
$
(263,691
)
 
$
445,499
Projected Amortization Expense
The following is an expected amortization schedule for the intangible assets for fiscal 2016 through fiscal 2020, absent any future acquisitions or impairment charges (amounts in thousands):

Year ending
March 31,
Projected Amortization
Expense
2016
$144,229
2017
92,642
2018
69,428
2019
56,577
2020
40,718
Goodwill Activity
Goodwill activity for fiscal years 2015 and 2014 was as follows (amounts in thousands):
 
Semiconductor Products
Reporting Unit
 
Technology
Licensing
Reporting Unit
Balance at March 31, 2013
$
252,148

 
$
19,200

Adjustments due to acquisition of SMSC
(3,473
)
 
—

Additions due to other acquisitions
8,111

 
—

Additions due to contingent consideration payments
111

 
—

Balance at March 31, 2014
256,897

 
19,200

Additions due to the acquisition of Supertex
143,160

 
—

Additions due to acquisition of controlling interest in ISSC
154,399

 
—

Adjustments due to other acquisitions
624

 
—

Foreign currency translation adjustments
(3,009
)
 
—

Balance at March 31, 2015
$
552,071

 
$
19,200