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Derivatives - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Sep. 30, 2017
Estimated unrealized gains, net of tax, expected to be reclassified in next 12 months	$ 3,600,000
Gains (losses) recognized in income for derivatives related to ineffective portions and amounts excluded from effectiveness testing	0	$ 0
Derivatives designated as hedging instruments | Derivatives in Cash Flow Hedging Relationships | Forward currency forward contracts
Notional amount of forward exchange contracts	68,400,000		$ 67,000,000
Fair value of derivative asset	3,600,000		2,000,000
Derivatives not designated as hedging instruments | Forward currency forward contracts
Notional amount of forward exchange contracts	17,800,000		10,600,000
Fair value of derivative liability	$ 300,000		$ 100,000

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
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-Subparagraph (a)
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Section 50
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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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