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Stock-based compensation (Tables)

12 Months Ended

Sep. 29, 2018

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

Schedule of stock option activity

Stock option activity was as follows:

	Number of Options			Weighted Average Exercise Price				Weighted Average Remaining Contractual Term		Weighted Average Intrinsic Value
								(in years)		(in thousands)
Outstanding at September 30, 2017	45,817,252			$	9.20			6.9		$	199,663
Granted	9,316,926			15.12
Exercised	(2,657,436	)		3.52
Forfeited	(3,971,280	)		13.14
Expired	(1,280	)		15.11
Outstanding at September 29, 2018	48,504,182			$	10.33			6.6		$	276,959
At September 29, 2018
Options exercisable	31,194,219			$	8.13			5.4		$	246,847
Options vested and expected to vest	45,662,090			$	10.07			6.5		$	272,699

Schedule of fair value of options

The fair value of options at the date of grant was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:

	2018			2017			2016
Expected term (years)	6.25			6.25			6.25
Risk-free interest rate	2.73	%		1.95	%		1.29	%
Expected volatility	30.19	%		32.40	%		36.64	%
Expected dividend yield	—	%		—	%		—	%

Schedule of stock-based compensation expense

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

	2018				2017				2016
(In thousands)
Cost of revenue	$	198			$	240			$	211
Research and development	13,960				13,605				8,260
Sales and marketing	15,885				15,086				11,742
General and administrative	8,602				7,619				5,750
Total stock-based compensation expense	$	38,645			$	36,550			$	25,963

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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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 significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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