Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Oct. 02, 2015
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative contracts designated as hedging instruments, Assets	$ 2,948	$ 1,386
Derivative contracts not designated as hedging instruments, Assets	143	189
Embedded derivatives, Assets	2,485	3,992
Derivative contracts designated as hedging instruments, Liabilities	7,828	24,660
Derivative contracts not designated as hedging instruments, Liabilities	6,720	2,324
Embedded derivatives, Liabilities	985	380
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated value of assets held for sale	26,850	52,768
Estimated value of liabilities held for sale	11,133	19,515
Contingent purchase obligation	$ 0	$ 3,750