Business Acquisitions (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	Apr. 04, 2016	Mar. 31, 2017
Business Acquisition [Line Items]
Net deferred tax liability for future amortization expense of acquired intangible assets	$ 178,100
Atmel Corporation
Business Acquisition [Line Items]
Cash paid for shares	$ 2,980,000
Shares issued as part of acquisition	10.1
Value of shares issued as part of acquisition	$ 486,100
Transaction and other fees incurred in transaction	14,900
Non cash consideration of certain share-based payment awards	7,500
Total consideration transferred	3,470,000
Liabilities assumed	653,100	$ 653,058
Payments to acquire businesses portion funded by foreign subsidiaries cash balances	2,040,000
Payments to acquire businesses portion funded by additional line of credit borrowings	$ 940,000