Business Acquisitions Schedule of Preliminary Allocation of Purchase Price (Details) (USD $)				3 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Jul. 17, 2014 ISSC Technologies Corporation [Member]	Sep. 30, 2014 Supertex Inc.	Jun. 30, 2014 Supertex Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 15,120,000	$ 14,790,000	$ 14,790,000
Short-term investments			27,063,000	140,984,000	140,984,000
Accounts receivable, net			8,792,000	7,047,000	7,047,000
Inventories			19,160,000	27,630,000	27,630,000
Prepaid expenses and other current assets			2,501,000
Prepaid expenses				1,493,000	1,493,000
Deferred tax assets				3,997,000	3,997,000
Other current assets				16,113,000	16,113,000
Property, plant and equipment, net			2,637,000	15,679,000	15,679,000
Goodwill	557,965,000	276,097,000	152,243,000	132,508,000	133,713,000
Purchased intangible assets			147,800,000	89,600,000	89,600,000
Other assets			1,370,000	325,000	325,000
Total assets acquired			376,686,000	450,166,000	451,371,000
Accounts payable			(9,860,000)	(8,481,000)	(8,481,000)
Other current liabilities			(16,997,000)
Accrued liabilities				(19,370,000)	(19,345,000)
Long-term income tax payable			(4,402,000)	(3,796,000)	(3,796,000)
Deferred tax liability			(25,126,000)	(26,742,000)	(27,972,000)
Other long-term liabilities			(245,000)
Total liabilities assumed			(56,630,000)	(58,389,000)	(59,594,000)
Net assets acquired			320,056,000	391,777,000	391,777,000
Less: noncontrolling interest			(52,467,000)
Net assets acquired			267,589,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Goodwill				(1,205,000)
Total assets acquired				(1,205,000)
Accrued liabilities				(25,000)
Deferred tax liability				1,230,000
Total liabilities assumed				$ (1,205,000)