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Commitments and contingencies - Textual (Details) $ in Thousands		12 Months Ended
	Mar. 10, 2017 patent	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)	Oct. 03, 2015 USD ($)
Loss Contingencies [Line Items]
Operating leases, rent expense		$ 14,500	$ 13,500	$ 14,500
Warranty accrual		$ 2,450	$ 2,437	$ 2,491	$ 2,722
Implicit, LLC
Loss Contingencies [Line Items]
Patents infringed upon | patent	2
Minimum
Loss Contingencies [Line Items]
Operating lease, term of contract		1 year
Maximum
Loss Contingencies [Line Items]
Operating lease, term of contract		10 years

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Number of another entity's patents that the entity has allegedly infringed.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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