Purchased Intangible Assets and Goodwill - Acquisitions (Details) - USD ($) $ in Thousands	Sep. 14, 2018	May 09, 2018	Sep. 28, 2012
Certain Flash Memory Product Assets from Atmel Corporation [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired			$ 16,400
S3 Asic Semiconductors Limited [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 15,340
Echelon Corporation [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 17,690