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Income taxes - Income (loss) before income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Income Tax Disclosure [Abstract]
Domestic	$ 2,803	$ (25,005)	$ (47,285)
Foreign	(17,351)	8,497	11,715
Income (loss) before provision for (benefit from) income taxes	$ (14,548)	$ (16,508)	$ (35,570)

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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-SubTopic 10
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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

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