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Intangible Assets, by Major Class (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Mar. 31, 2014
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Sep. 30, 2014
Core/developed technology
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Mar. 31, 2014
Core/developed technology
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Sep. 30, 2014
Customer Relationships [Member]
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Mar. 31, 2014
Customer Relationships [Member]
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Sep. 30, 2014
Trademarks and trade names [Member]
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Mar. 31, 2014
Trademarks and trade names [Member]
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Sep. 30, 2014
Backlog [Member]
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Mar. 31, 2014
Backlog [Member]
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Sep. 30, 2014
In-process technology [Member]
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Mar. 31, 2014
In-process technology [Member]
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Sep. 30, 2014
Distribution rights [Member]
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Mar. 31, 2014
Distribution rights [Member]
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Sep. 30, 2014
Covenants not to compete [Member]
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Mar. 31, 2014
Covenants not to compete [Member]
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Sep. 30, 2014
Minimum [Member]
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Sep. 30, 2014
Maximum [Member]
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Apr. 01, 2014
Supertex Inc. [Member]
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Apr. 01, 2014
Supertex Inc. [Member]
Core/developed technology
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Apr. 01, 2014
Supertex Inc. [Member]
Backlog [Member]
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Sep. 30, 2014
Cost of Sales [Member]
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Sep. 30, 2013
Cost of Sales [Member]
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Sep. 30, 2014
Cost of Sales [Member]
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Sep. 30, 2013
Cost of Sales [Member]
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Sep. 30, 2014
Operating Expense [Member]
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Sep. 30, 2013
Operating Expense [Member]
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Sep. 30, 2014
Operating Expense [Member]
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Sep. 30, 2013
Operating Expense [Member]
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| Finite-Lived Intangible Assets, Net [Abstract] | ||||||||||||||||||||||||||||||||
| Gross Amount | $ 946,930,000 | $ 946,930,000 | $ 709,190,000 | $ 559,828,000 | $ 402,669,000 | $ 263,805,000 | $ 195,800,000 | $ 15,730,000 | $ 15,730,000 | $ 26,302,000 | $ 24,610,000 | $ 75,280,000 | $ 64,396,000 | $ 5,585,000 | $ 5,585,000 | $ 400,000 | $ 400,000 | |||||||||||||||
| Accumulated Amortization | (347,905,000) | (347,905,000) | (263,691,000) | (161,145,000) | (117,222,000) | (147,489,000) | (109,170,000) | (8,323,000) | (7,118,000) | (25,331,000) | (24,610,000) | 0 | 0 | (5,217,000) | (5,171,000) | (400,000) | (400,000) | |||||||||||||||
| Net Amount | 599,025,000 | 599,025,000 | 445,499,000 | 398,683,000 | 285,447,000 | 116,316,000 | 86,630,000 | 7,407,000 | 8,612,000 | 971,000 | 0 | 75,280,000 | 64,396,000 | 368,000 | 414,000 | 0 | 0 | |||||||||||||||
| In-process technology reaching technological feasibility and reclassified | 24,400,000 | |||||||||||||||||||||||||||||||
| Purchased Intangible Assets | 89,600,000 | 68,900,000 | 1,100,000 | |||||||||||||||||||||||||||||
| Useful Life | 1 year | 15 years | 10 years | 1 year | ||||||||||||||||||||||||||||
| Minimum expected useful life of finite lived intangible assets (in years) | 1 year | 15 years | 10 years | 1 year | ||||||||||||||||||||||||||||
| Amortization of Intangible Assets | 46,500,000 | 25,100,000 | 84,200,000 | 54,000,000 | 1,000,000 | 1,300,000 | 2,000,000 | 2,500,000 | 45,500,000 | 23,800,000 | 82,200,000 | 51,500,000 | ||||||||||||||||||||
| Impairment of Intangible Assets | 150,000 | 556,000 | 350,000 | |||||||||||||||||||||||||||||
| Future Amortization Expense, Remainder of Fiscal Year | 99,063,000 | 99,063,000 | ||||||||||||||||||||||||||||||
| Future Amortization Expense, Year Two | 150,298,000 | 150,298,000 | ||||||||||||||||||||||||||||||
| Future Amortization Expense, Year Three | 92,227,000 | 92,227,000 | ||||||||||||||||||||||||||||||
| Future Amortization Expense, Year Four | 73,926,000 | 73,926,000 | ||||||||||||||||||||||||||||||
| Future Amortization Expense, Year Five | $ 65,650,000 | $ 65,650,000 | ||||||||||||||||||||||||||||||