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Purchase Obligations (Detail)
$ in Thousands
Sep. 28, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Purchase obligations, Total $ 776,221
Purchase obligations, Less than 1 year 714,048
Purchase obligations, 1-3 years 61,540
Purchase obligations, 4-5 years 633
Purchase obligations, After 5 years $ 0