Derivatives and Fair Value Measurements - Narrative (Details) - USD ($)	12 Months Ended
Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Estimated unrealized losses, net of tax, expected to be reclassified in next 12 months	$ 600,000
Gains (losses) recognized in income for derivatives related to ineffective portions and amounts excluded from effectiveness testing	0	$ 0	$ 0
Derivatives designated as hedging instruments \| Derivatives in Cash Flow Hedging Relationships \| Forward currency forward contracts
Notional amount of forward exchange contracts	80,000,000.0	74,000,000.0
Fair value of derivative liability	600,000	1,700,000
Derivatives not designated as hedging instruments \| Forward currency forward contracts
Notional amount of forward exchange contracts	34,400,000	28,600,000
Fair value of derivative liability		$ 100,000
Fair value of derivative asset	$ 900,000

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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Nominal or face amount used to calculate payments on the derivative asset.

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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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