Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative contracts designated as hedging instruments, Assets	$ 8,473	$ 13,932
Derivative contracts not designated as hedging instruments, Assets	745	284
Embedded derivatives, Assets	1,118	746
Derivative contracts designated as hedging instruments, Liabilities	2,378	464
Derivative contracts not designated as hedging instruments, Liabilities	874	2,440
Embedded derivatives, Liabilities	1,191	2,239
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated value of assets held for sale	18,418	19,835
Estimated value of liabilities held for sale	$ 7,636	$ 8,908