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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Aug. 25, 2018
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:
| Year Ended
(In thousands) | August 25, 2018 |  | August 26, 2017 |  | August 27, 2016
Share awards: |  |  |  |  |
Performance-based | $ | 2,525 |  |  | $ | 69 |  |  | $ | 807 |
Time-based | 4,152 |  |  | 2,606 |  |  | 2,326 |
Stock options | 502 |  |  | 164 |  |  | 11 |
Other(1) | 255 |  |  | 138 |  |  | 149 |
Total stock-based compensation | $ | 7,434 |  |  | $ | 2,977 |  |  | $ | 3,293 |
(1) | Includes stock-based compensation expense related to Board of Directors stock unit 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 share award activity for Fiscal 2018, 2017 and 2016 is as follows:
| Year Ended
| August 25, 2018 |  | August 26, 2017 |  | August 27, 2016
| Shares | Weighted Average Grant Date Fair Value |  | Shares | Weighted Average Grant Date Fair Value |  | Shares | Weighted Average Grant Date Fair Value
Beginning of year | 243,769 |  | $ | 23.61 |  |  | 283,881 |  | $ | 20.45 |  |  | 163,420 |  | $ | 20.83 |
Granted | 167,781 |  | 42.54 |  |  | 156,801 |  | 28.13 |  |  | 240,270 |  | 19.72 |
Vested | (100,648 | ) | 23.96 |  |  | (159,979 | ) | 22.66 |  |  | (110,283 | ) | 19.44 |
Cancelled | (25,711 | ) | 29.64 |  |  | (36,934 | ) | 22.61 |  |  | (9,526 | ) | 20.28 |
End of year | 285,191 |  | $ | 34.08 |  |  | 243,769 |  | $ | 23.61 |  |  | 283,881 |  | $ | 20.45 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of stock option activity for Fiscal 2018, 2017 and 2016 is as follows:
| Year Ended
| August 25, 2018 |  | August 26, 2017 |  | August 27, 2016
| Shares | Wtd. Avg. Exercise Price/Share |  | Shares | Wtd. Avg. Exercise Price/Share |  | Shares | Wtd. Avg. Exercise Price/Share
Outstanding at beginning of year | 65,800 |  | $ | 28.15 |  |  | 10,000 |  | $ | 16.67 |  |  | 167,394 |  | $ | 28.30 |
Options granted | 72,710 |  | 44.40 |  |  | 63,800 |  | 29.92 |  |  | 10,000 |  | 16.67 |
Options cancelled | — |  | — |  |  | (8,000 | ) | 27.89 |  |  | (167,394 | ) | 28.30 |
Outstanding at end of year | 138,510 |  | $ | 36.68 |  |  | 65,800 |  | $ | 28.15 |  |  | 10,000 |  | $ | 16.67 |
Exercisable at end of year | 25,263 |  | $ | 26.64 |  |  | 3,333 |  | $ | 16.67 |  |  | — |  | $ | — |
Vested and expected to vest at end of year | 138,510 |  | $ | 36.68 |  |  | 65,800 |  | $ | 28.15 |  |  | 10,000 |  | $ | 16.67 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average valuation assumptions:
Valuation Assumptions(1) | Fiscal 2018 |  | Fiscal 2017 |  | Fiscal 2016
Expected dividend yield | 0.90 | % |  | 1.35 | % |  | 2.40 | %
Risk-free interest rate (2) | 1.99 | % |  | 1.47 | % |  | 1.49 | %
Expected life (in years) (3) | 5 |  |  | 5 |  |  | 5 |
Expected volatility (4) | 38.08 | % |  | 39.34 | % |  | 43.52 | %
Weighted average fair value of options granted |  | $14.78 |  |  |  | $9.58 |  |  |  | $5.31 |
(1) | Forfeitures are recorded when they occur.
(2) | Risk-free interest rate is based on Treasury Securities constant maturity interest rate whose term is consistent with the expected life of the stock options.
(3) | Expected life of stock options is based on historical experience.
(4) | Expected stock price volatility is 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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