Derivative Instruments and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Sep. 28, 2018
Minimum
Derivative [Line Items]
Derivative, Remaining Maturity	1 month
Maximum
Derivative [Line Items]
Derivative, Remaining Maturity	13 months
Foreign currency forward contracts
Derivative [Line Items]
Derivative, term of contract (in months)	1 month
Foreign currency forward contracts | Minimum
Derivative [Line Items]
Derivative, Remaining Maturity	1 month
Foreign currency forward contracts | Maximum
Derivative [Line Items]
Derivative, Remaining Maturity	13 months