Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 29, 2017	Sep. 30, 2016
Foreign Exchange Forward | Other Current Assets
Derivatives Fair Value [Line Items]
Derivative Instruments, Assets	$ 11,433	$ 1,803
Foreign Exchange Forward | Other Assets
Derivatives Fair Value [Line Items]
Derivative Instruments, Assets	2,783	1,470
Foreign Exchange Forward | Other Liabilities
Derivatives Fair Value [Line Items]
Derivative Instruments, Liabilities	398	3,187
Foreign Exchange Forward | Accrued Liabilities
Derivatives Fair Value [Line Items]
Derivative Instruments, Liabilities	2,506	11,006
Embedded Derivative Financial Instruments | Other Current Assets
Derivatives Fair Value [Line Items]
Derivative Instruments, Assets	604	1,864
Embedded Derivative Financial Instruments | Other Assets
Derivatives Fair Value [Line Items]
Derivative Instruments, Assets	142	621
Embedded Derivative Financial Instruments | Other Liabilities
Derivatives Fair Value [Line Items]
Derivative Instruments, Liabilities	582	119
Embedded Derivative Financial Instruments | Accrued Liabilities
Derivatives Fair Value [Line Items]
Derivative Instruments, Liabilities	$ 1,657	$ 866