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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Aug. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Total stock-based compensation expense for the past three fiscal years consisted of the following components:
(in thousands)
2019
 
2018
 
2017
Share awards:
 
 
 
 
 
Time-based
$
4,986

 
$
4,152

 
$
2,606

Performance-based
716

 
2,525

 
69

Stock options
925

 
502

 
164

Other(1)
431

 
255

 
138

Total stock-based compensation expense
$
7,058

 
$
7,434

 
$
2,977

(1)
Includes stock-based compensation expense related to Board of Directors stock award expense and ESPP expense. Directors may elect to defer all or part of their annual retainer into a deferred compensation plan. The plan allows them to defer into either money units or stock units and is more fully described in the Proxy Statement.
Schedule of Nonvested Share Activity [Table Text Block]
A summary of the status of our nonvested time-based share awards at August 31, 2019, and changes during Fiscal 2019, were as follows:
 
Shares
 
Weighted Average Fair Value
Outstanding at August 25, 2018
285,191

 
$
34.08

Granted
152,152

 
$
31.70

Vested
(213,379
)
 
$
32.88

Forfeited/canceled
(8,458
)
 
$
38.58

Outstanding at August 31, 2019
215,506

 
$
33.40
Share-based Compensation, Performance Shares Award Nonvested Activity [Table Text Block]
A summary of the status of our nonvested performance-based share awards at August 31, 2019, and changes during Fiscal 2019, were as follows:
 
Shares
 
Weighted Average Fair Value
Outstanding at August 25, 2018
127,226

 
$
35.08

Granted
80,207

 
$
31.70

Vested
—

 
$
—

Forfeited/canceled
—

 
$
—

Outstanding at August 31, 2019
207,433

 
$
33.77
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity for Fiscal 2019 is as follows:
 
Stock Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at August 25, 2018
138,510

 
$
36.68

 
 
 
 
Granted
114,635

 
$
31.70

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Forfeited/canceled
—

 
$
—

 
 
 
 
Outstanding at August 31, 2019
253,145

 
$
34.43

 
8.3
 
$
350.4

Vested and expected to vest at August 31, 2019
253,145

 
$
34.43

 
8.3
 
$
350.4

Exercisable at August 31, 2019
71,426

 
$
33.13

 
7.4
 
$
260.3
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each stock option is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions:
Valuation Assumptions(1)
2019
 
2018
 
2017
Expected dividend yield
1.3
%
 
0.9
%
 
1.4
%
Risk-free interest rate(2)
3.0
%
 
2.0
%
 
1.5
%
Expected life of stock options (in years)(3)
5

 
5

 
5

Expected stock price volatility(4)
39.1
%
 
38.1
%
 
39.3
%
Weighted average fair value of options granted
$
11.09

 
$
14.78

 
$
9.58

(1)
Forfeitures are recorded when they occur.
(2)
Based on U.S. Treasury constant maturity interest rate whose term is consistent with the expected life of our stock options.
(3)
Estimated based on historical experience.
(4)
Based on historical experience over a term consistent with the expected life of the stock options.