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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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