Stock Incentive Plan (Tables)

12 Months Ended

Sep. 30, 2017

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

Schedule of Assumptions

The assumptions used in the Black-Scholes option pricing model to value the options granted and modified were as follows:    

	Fiscal Year Ended
	September 30, 2017		September 30, 2016		September 25, 2015
Expected dividend yield	—	%	—	%	—	%
Expected volatility	40	%	40	%	35	%
Range of risk-free interest rates (%)	1.95		0.74 - 1.27		0.85 - 1.74
Range of expected option lives	6.00 years		2.09 - 6.37 years		2.51 - 6.35 years

The assumptions used in the Monte-Carlo method to value the performance share awards granted during the fiscal year ended September 30, 2017 were as follows: 

	September 30, 2017
Expected dividend yield	—		%
Range of expected volatility	17.55 - 75.55
Risk free interest rates	1.35		%
Expected life	3 years
Fair value	$	29.53

Schedule of Stock Option Activity

Stock option activity for the period September 26, 2014 to September 30, 2017 was as follows: 

	Shares (in thousands)		Weighted-Average Exercise Price		Weighted-Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)		Weighted-Average Remaining Contractual Term (in years)
Outstanding as of September 26, 2014	7,673		$	7.59
Granted	290		9.04		$	9.09
Exercised	(500	)	7.30				$	914
Forfeited	(717	)	7.30
Outstanding as of September 25, 2015	6,746		7.70
Granted	72		15.79		$	7.63
Exercised	(18	)	7.95				$	43
Forfeited	(136	)	8.84
Outstanding as of September 30, 2016	6,664		7.76
Granted	171		21.45		$	8.84
Exercised	(1,629	)	7.47				$	25,757
Forfeited	(48	)	9.02
Outstanding as of September 30, 2017	5,158		8.30				$	58,175	5.6
Exercisable as of September 30, 2017	3,600		$	7.67			$	42,605	5.2

Schedule of Nonvested Share Activity

Changes to the Company's nonvested RSU awards for the year ended September 30, 2017 were as follows:

	Shares (in thousands)		Weighted-average grant-date fair value
Nonvested as of September 30, 2016	—		$	—
Granted	443		19.68
Forfeited	(8	)	21.45
Nonvested as of September 30, 2017	435		$	19.65

Changes to the Company's nonvested PSU awards for the year ended September 30, 2017 were as follows:

	Shares (in thousands)		Weighted-average grant-date fair value
Nonvested as of September 30, 2016	—		$	—
Granted	184		23.87
Forfeited	(3	)	23.87
Nonvested as of September 30, 2017	181		$	23.87