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Share-Based Payments (Tables)
12 Months Ended
Aug. 31, 2019
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 31,
2019
  
August 25,
2018
  
August 26,
2017
 
Expected price volatility
  21  20  18
Risk-free interest rates
  3.0  1.9  1.2
Weighted average expected lives (in years)
  5.6   5.1   5.1 
Forfeiture rate
  10  10  10
Dividend yield
  0  0  0
Stock Option Activity
The following table summarizes information about stock option activity for the year ended August 31, 2019:
 
  
Number

of Shares
  
Weighted

Average

Exercise
Price
  
Weighted-
Average
Remaining
Contractual
Term

(in years)
  
Aggregate

Intrinsic
Value

(in thousands)
 
Outstanding – August 25, 2018
  1,706,866  $534.74         
Granted
  172,750   774.33         
Exercised
  (471,216  413.60         
Cancelled
  (59,089  679.92         
  
 
 
             
Outstanding – August 31, 2019
  1,349,311   601.36   6.08  $675,097 
  
 
 
             
Exercisable
  793,266   528.85   4.88   454,415 
  
 
 
             
Expected to vest
  500,441   704.81   7.80   198,614 
  
 
 
             
Available for future grants
  547,519             
  
 
 
             
Schedule of Nonvested Restricted Stock Units Activity
Transactions related to restricted stock units for the fiscal year ended August 31, 2019 as follow:
 
  
Number

of Shares
  
Weighted-
Average Grant
Date Fair Value
 
Nonvested at August 25, 2018
  —     —   
Granted
  13,021  $786.08 
Vested
  (2,514)  838.34 
Canceled or forfeited
  (458  772.80 
  
 
 
  
 
 
 
Nonvested at August 31, 2019
  10,049  $773.61