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Intangible Assets and Goodwill (Notes) | 6 Months Ended
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Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Intangible Assets and Goodwill Intangible assets consist of the following (amounts in thousands):
|  | September 30, 2014
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Developed technology |  | $ | 559,828 |  |  | $ | (161,145 | ) |  | $ | 398,683 |
Customer-related |  | 263,805 |  |  | (147,489 | ) |  | 116,316 |
Trademarks and trade names |  | 15,730 |  |  | (8,323 | ) |  | 7,407 |
Backlog |  | 26,302 |  |  | (25,331 | ) |  | 971 |
In-process technology |  | 75,280 |  |  | — |  |  | 75,280 |
Distribution rights |  | 5,585 |  |  | (5,217 | ) |  | 368 |
Covenants not to compete |  | 400 |  |  | (400 | ) |  | — |
|  | $ | 946,930 |  |  | $ | (347,905 | ) |  | $ | 599,025 |
|  | 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 |
The Company amortizes intangible assets over their expected useful lives, which range between 1 and 15 years. During the six months ended September 30, 2014, $24.4 million of in-process technology reached technological feasibility and was reclassified as developed technology and began being amortized over its estimated useful life. The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2015 through fiscal 2019, absent any future acquisitions or impairment charges (amounts in thousands):
Year ending March 31, | Projected Amortization Expense
2015 | $99,063
2016 | 150,298
2017 | 92,227
2018 | 73,926
2019 | 65,650
Amortization expense attributed to intangible assets was $46.5 million and $84.2 million for the three and six months ended September 30, 2014, respectively. Amortization expense attributed to intangible assets was $25.1 million and $54.0 million for the three and six months ended September 30, 2013, respectively. In the three and six months ended September 30, 2014, approximately $1.0 million and $2.0 million was charged to cost of sales, respectively, and approximately $45.5 million and $82.2 million was charged to operating expenses, respectively. In the three months and six months ended September 30, 2013, approximately $1.3 million and $2.5 million was charged to cost of sales, respectively, and approximately $23.8 million and $51.5 million was charged to operating expenses, respectively. The Company recognized impairment charges of $0.2 million and $0.6 million in the three and six months ended September 30, 2014, respectively. The Company recognized impairment charges of $0.4 million in the three and six months ended September 30, 2013. Goodwill activity for the six months ended September 30, 2014 was as follows (amounts in thousands):
| Semiconductor Products Reporting Unit |  | Technology Licensing Reporting Unit
Balance at March 31, 2014 | $ | 256,897 |  |  | $ | 19,200 |
Additions due to the acquisition of Supertex | 132,508 |  |  | — |
Additions due to acquisition of controlling interest in ISSC | 152,243 |  |  | — |
Adjustments due to other acquisitions | 625 |  |  | — |
Foreign currency translation adjustments | (3,508 | ) |  | — |
Balance at September 30, 2014 | $ | 538,765 |  |  | $ | 19,200 |
At September 30, 2014, $538.8 million of goodwill was recorded in the Company's semiconductor products reporting unit and $19.2 million was recorded in the Company's technology licensing reporting unit. At March 31, 2014, the Company applied a qualitative goodwill impairment screen to its two reporting units, concluding it was not more likely than not that goodwill was impaired. Through September 30, 2014, the Company had never recorded an impairment charge against its goodwill balance.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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