Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Derivatives - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
Derivatives - Narrative (Details) - USD ($)	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018	Sep. 29, 2018
Estimated unrealized gains (losses), net of tax, expected to be reclassified in next 12 months			$ 700,000
Gains (losses) recognized in income for derivatives related to ineffective portions and amounts excluded from effectiveness testing	$ 0	$ 0	0	$ 0
Derivatives designated as hedging instruments \| Derivatives in Cash Flow Hedging Relationships \| Foreign currency forward contracts
Notional amount of forward exchange contracts	77,100,000		77,100,000		$ 74,000,000
Fair value of derivative asset	700,000		700,000
Fair value of derivative liability					1,700,000
Derivatives not designated as hedging instruments \| Foreign currency forward contracts
Notional amount of forward exchange contracts	34,600,000		34,600,000		28,600,000
Fair value of derivative asset	$ 300,000		$ 300,000
Fair value of derivative liability					$ 100,000