Stockholders' Equity and Stock Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Schedule of the stock-based compensation and related income tax benefits

The stock-based compensation and related income tax benefits were as follows:

	Fiscal Year Ended
	September 30, 2018			October 1, 2017			October 2, 2016
	(in thousands)
Total stock-based compensation	$	19,582		$	13,450		$	12,964
Income tax benefit related to stock-based compensation	(5,288		)	(4,715		)	(4,656		)
Stock-based compensation, net of tax benefit	$	14,294		$	8,735		$	8,308

Schedule of stock option activity

Stock option activity for the fiscal year ended September 30, 2018 was as follows:

	Number of Options (in thousands)		Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding on October 1, 2017	1,753		$	27.18
Granted	171		48.01
Exercised	(549	)	50.85
Forfeited	(20	)	26.90
Outstanding at September 30, 2018	1,355		30.87		5.17	$	50,689
Vested or expected to vest at September 30, 2018	1,330		30.94		5.13	49,694
Exercisable on September 30, 2018	929		27.21		3.93	38,152

Schedule of assumptions used in the calculation of the fair value of stock options using the Black-Scholes option pricing model

The fair value of our stock options was estimated on the date of grant using the Black-Scholes option pricing model. The following assumptions were used in the calculation:

	Fiscal Year Ended
	September 30, 2018	October 1, 2017	October 2, 2016
Dividend yield	1.0%	1.0%	1.2%
Expected stock price volatility	36.1% - 38.8%	36.1% - 38.8%	36.1% - 38.8%
Risk-free rate of return, annual	1.7% - 2.9%	1.7% - 1.9%	1.6% - 1.8%

Schedule of RSU and PSU activity

A summary of the RSU and PSU activity under our stock plans is as follows:

	RSU				PSU
	Number of Shares (in thousands)		Weighted- Average Grant Date Fair Value per Share		Number of Shares (in thousands)		Weighted- Average Grant Date Fair Value per Share
Nonvested balance at September 27, 2015	483		$	26.75	139		$	31.66
Granted	217		27.14		138		31.63
Vested	(180	)	26.03		—		—
Forfeited	(21	)	27.11		—		—
Nonvested balance at October 2, 2016	499		27.16		277		31.65
Granted	226		41.00		99		48.36
Vested	(186	)	26.98		—		—
Forfeited	(28	)	30.15		—		—
Nonvested balance at October 1, 2017	511		33.19		376		36.05
Granted	199		48.16		99		57.40
Vested	(184	)	31.85		(139	)	31.66
Forfeited	(38	)	36.39		(13	)	41.80
Nonvested balance at September 30, 2018	488		39.56		323		44.27

Summary of shares purchased, weighted-average purchase price, cash received, and the aggregate intrinsic value for shares purchased under the ESPP

The following table summarizes shares purchased, weighted-average purchase price, cash received and the aggregate intrinsic value for shares purchased under the ESPP:

	Fiscal Year Ended
	September 30, 2018		October 1, 2017		October 2, 2016
	(in thousands, except for purchase price)
Shares purchased	141		190		209
Weighted-average purchase price	$	40.38	$	26.02	$	22.54
Cash received from exercise of purchase rights	$	5,727	$	4,940	$	4,707
Aggregate intrinsic value	$	337	$	—	$	710

Schedule of the assumptions used in the Black-Scholes option pricing model in estimating the grant date fair value of each award granted under the ESPP

The grant date fair value of each award granted under the ESPP was estimated using the Black-Scholes option pricing model with the following assumptions:

	Fiscal Year Ended
	September 30, 2018	October 1, 2017	October 2, 2016
Dividend yield	1.0%	1.0%	1.3%
Expected stock price volatility	24.0%	22.4%	23.7%
Risk-free rate of return, annual	1.8%	0.9%	0.2%
Expected life (in years)	1	1	1