Share-Based Payments (Tables)

12 Months Ended

Aug. 26, 2017

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

Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted and Related Share-Based Compensation Expense

The following table presents the weighted average for key assumptions used in determining the fair value of options granted and the related share-based compensation expense:

	Year Ended
	August 26, 2017		August 27, 2016		August 29, 2015
Expected price volatility		18%		18%		20%
Risk-free interest rates		1.2%		1.5%		1.4%
Weighted average expected lives (in years)		5.1		5.1		5.1
Forfeiture rate		10%		10%		9%
Dividend yield		0%		0%		0%

Stock Option Activity

The Company generally issues new shares when options are exercised. The following table summarizes information about stock option activity for the year ended August 26, 2017:

	Number of Shares			Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding – August 27, 2016		1,759,408		$	428.72
Granted		290,805			744.80
Exercised		(207,069	)		263.02
Cancelled		(45,089	)		657.78
Outstanding – August 26, 2017		1,798,055			493.18		6.17	$	199,752
Exercisable		1,041,933			362.38		4.76		189,790
Expected to vest		680,510			673.42		8.10		8,966
Available for future grants		898,992