Derivatives - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018
Estimated unrealized gains (losses), net of tax, expected to be reclassified in next 12 months			$ 300,000
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	78,300,000		78,300,000		$ 74,000,000.0
Fair value of derivative asset	300,000		300,000
Fair value of derivative liability					1,700,000
Derivatives Not Designated as Hedging Instruments \| Foreign currency forward contracts
Notional amount of forward exchange contracts	33,800,000		33,800,000		28,600,000
Fair value of derivative liability	$ 300,000		$ 300,000		$ 100,000

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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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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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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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