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Commitments and Contingencies (Litigations and Patent Reexaminations) (Details) $ in Millions			6 Months Ended	15 Months Ended
	Oct. 31, 2017 patent	Sep. 01, 2016 patent	Jun. 30, 2018 USD ($) claim patent	Mar. 31, 2018 USD ($)
Commitments and Contingencies
Legal expenses excluded as a result of TRGP's payment of these expenses under the TRGP Agreement | $			$ 1.5	$ 11.7
Inphi Litigation
Commitments and Contingencies
Number of patents claimed to be invalid			3
912 Patent Reexamination
Commitments and Contingencies
Number of claims rejected | claim			11
SK Hynix Litigation
Commitments and Contingencies
Number of patents infringed upon	2	6

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