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Business Acquisitions (Narrative) (Details) (USD $)
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6 Months Ended | 0 Months Ended | 3 Months Ended | 0 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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Jul. 17, 2014
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Jul. 17, 2014
ISSC Technologies Corporation [Member]
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Sep. 30, 2014
ISSC Technologies Corporation [Member]
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Jul. 17, 2014
ISSC Technologies Corporation [Member]
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Apr. 01, 2014
Supertex Inc.
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Sep. 30, 2014
Supertex Inc.
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Sep. 30, 2014
Supertex Inc.
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Apr. 01, 2014
Supertex Inc.
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| Business Acquisition [Line Items] | ||||||||||
| Tendered offer price per share | $ 33.00 | |||||||||
| Percentage of interest acquired in acquisition | 83.50% | |||||||||
| Purchased price paid | $ 267,600,000 | |||||||||
| Consideration transferred | 391,800,000 | |||||||||
| Non cash consideration of certain share-based payment awards | 1,600,000 | |||||||||
| Cash and short-term investments acquired | 155,800,000 | |||||||||
| Amount of cash paid, net of cash and short-term investments acquired | 375,365,000 | 0 | 234,400,000 | |||||||
| Net deferred tax liability for future amortization expense of acquired intangible assets | 25,100,000 | 22,800,000 | ||||||||
| Revenue of acquiree included in statement of income since the acquisition date | 16,900,000 | 16,600,000 | 34,400,000 | |||||||
| Net income (loss) of acquiree included in statement of income since the acquisition date | $ (8,200,000) | |||||||||