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Purchase Obligations (Detail)
$ in Thousands
Sep. 30, 2016
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Purchase obligations, Total $ 657,396
Purchase obligations, Less than 1 year 621,660
Purchase obligations, 1-3 years 29,288
Purchase obligations, 4-5 years 5,313
Purchase obligations, After 5 years $ 1,135