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Equity Plans (Tables) | 9 Months Ended
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May 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Options Granted and Valuation Assumptions |
| Quarter ended |  | Nine months ended
| May 30, 2019 |  | May 31, 2018 |  | May 30, 2019 |  | May 31, 2018
Stock options granted | — |  |  | — |  |  | — |  |  | 2 |
Weighted-average grant-date fair value per share | — |  |  | $ | 24.14 |  |  | $ | 19.50 |  |  | $ | 18.61 |
Average expected life in years | — |  |  | 5.4 |  |  | 5.4 |  |  | 5.5 |
Weighted-average expected volatility | — |  |  | 45 | % |  | 44 | % |  | 44 | %
Weighted-average risk-free interest rate | — |  |  | 2.8 | % |  | 2.9 | % |  | 2.2 | %
Expected dividend yield | — |  |  | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Schedule of Restricted Stock Awards Activity |
| Quarter ended |  | Nine months ended
| May 30, 2019 |  | May 31, 2018 |  | May 30, 2019 |  | May 31, 2018
Restricted stock award shares granted | 1 |  |  | — |  |  | 7 |  |  | 4 |
Weighted-average grant-date fair value per share | $ | 40.00 |  |  | $ | 53.77 |  |  | $ | 39.83 |  |  | $ | 42.14 |
Employee Stock Purchase Plan Valuation Assumptions |
Weighted-average grant-date fair value per share | $ | 10.92 |
Average expected life in years | 0.5 |
Weighted-average expected volatility | 47 | %
Weighted-average risk-free interest rate | 2.5 | %
Expected dividend yield | 0.0 | %
Stock-based Compensation Expense by Caption |
| Quarter ended |  | Nine months ended
| May 30, 2019 |  | May 31, 2018 |  | May 30, 2019 |  | May 31, 2018
Stock-based compensation expense by caption |  |  |  |  |  |  |
Cost of goods sold | $ | 24 |  |  | $ | 20 |  |  | $ | 73 |  |  | $ | 62 |
Selling, general, and administrative | 18 |  |  | 14 |  |  | 55 |  |  | 48 |
Research and development | 16 |  |  | 14 |  |  | 48 |  |  | 41 |
| $ | 58 |  |  | $ | 48 |  |  | $ | 176 |  |  | $ | 151 |
Stock-based compensation expense by type of award |  |  |  |  |  |  |
Restricted stock awards | $ | 44 |  |  | $ | 35 |  |  | $ | 127 |  |  | $ | 107 |
Stock options | 6 |  |  | 13 |  |  | 25 |  |  | 44 |
Employee Stock Purchase Plan | 8 |  |  | — |  |  | 24 |  |  | — |
| $ | 58 |  |  | $ | 48 |  |  | $ | 176 |  |  | $ | 151 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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 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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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