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Contingencies and Certain Matters Resolved During Fiscal Year 2015 - Additional Information 1 (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
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Sep. 05, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Apr. 03, 2015
Gain Contingencies [Line Items] |  |  |  |
Litigation settlement amount | $ 108,712 |  |  |
Proceeds from legal settlement |  | $ 27,500 | $ 27,500 | $ 53,700
Product revenues |  | 713,936 | 664,821 | 728,074
Interest income |  | 700 | 2,200 | 2,000
Implied License [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Litigation settlement amount | $ 85,132 |  |  |
Satellite Services [Member] | Operating Segments [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Product revenues |  | 27,711 | 25,606 | 33,576
Satellite Services [Member] | Operating Segments [Member] | Implied License [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Product revenues |  | $ 26,800 | $ 25,300 | 33,000
Selling, General and Administrative Expenses [Member] | Satellite Services [Member] | Operating Segments [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Litigation settlement amount |  |  |  | $ 18,700

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