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Stock-based compensation (Tables)

3 Months Ended

Dec. 29, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Option Activity

	Number of Options			Weighted Average Exercise Price				Weighted Average Remaining Contractual Term		Weighted Average Intrinsic Value
								(in years)		(in thousands)
Outstanding at September 29, 2018	48,504,182			$	10.33			6.6		$	276,959
Granted	976,328
Exercised	(174,453	)
Forfeited	(720,463	)
Outstanding at December 29, 2018	48,585,594			$	10.40			6.4		$	98,745
At December 29, 2018
Options exercisable	32,514,889			$	8.44			5.3		$	98,745
Options vested and expected to vest	45,915,517			$	10.16			6.3		$	98,745

Schedule of Restricted Stock Unit Activity

The summary of the Company’s unvested RSU activity is as follows:

	Number of Units			Weighted Average Grant Date Fair Value				Weighted Average Intrinsic Value
								(in thousands)
Unvested at September 29, 2018	—			$	—			$	—
Granted	579,841
Vested	—
Forfeited	—
Unvested at December 29, 2018	579,841			$	14.91			$	5,619
At December 29, 2018
Units expected to vest	434,360			$	14.92			$	4,209

Schedule of Stock-based Compensation Expense

Total stock-based compensation expense by function category was as follows:

	Three Months Ended
	December 29, 2018				December 30, 2017
(In thousands)
Cost of revenue	$	184			$	56
Research and development	3,604				3,381
Sales and marketing	2,681				3,986
General and administrative	2,563				2,114
Total stock-based compensation expense	$	9,032			$	9,537

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Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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