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Fair Value Measurements and Investments Additional Information (Details)
Sep. 28, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Transfers of Assets from level 1 to level 2 $ 0
Transfer of assets from level 2 to level 1 0
Transfers of liabilitiesfrom level 1 to level 2 0
Transfer of Liabilities from level 2 to level 1 $ 0