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Share-Based Payments - Additional Information (Detail) - USD ($) | 12 Months Ended
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Aug. 26, 2017 | Aug. 27, 2016 | Aug. 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense related to stock options and share purchase plans | $ 38,244,000 | $ 39,825,000 | $ 40,995,000
Share-based compensation expense for unvested awards not yet recognized in earnings | $ 37,900,000 |  |
Weighted average period recognition of share-based compensation expense for unvested awards | 1 year 11 months 23 days |  |
Excess tax benefit |  | $ 63,700,000 | $ 47,900,000
Term of options from grant date | 10 years or 10 years and one day |  |
Exercise period of vested options after death | 1 year |  |
Restricted stock units granted under Director Compensation Program, description | Under the 2011 Program, restricted stock units are granted the first day of each calendar quarter. The number of restricted stock units granted each quarter is determined by dividing one-fourth of the amount of the annual retainer by the fair market value of the shares of common stock as of the grant date |  |
Outstanding options | 1,798,055 | 1,759,408 |
Common stock reserved for future issuance | 178,300 |  |
Weighted average grant date fair value of options granted | $ 139.80 | $ 156.20 | $ 106.27
Intrinsic value of options exercised | $ 93,900,000 | $ 178,000,000 | $ 154,800,000
Total fair value of options vested | 34,700,000 | 32,200,000 | 30,600,000
Expense related to the discount on the selling of shares to employees and executives | $ 1,800,000 | $ 2,000,000 | $ 2,100,000
Percent of market price at which employees permitted to purchase through payroll deductions | 85.00% |  |
Maximum permitted annual purchases per employee | $ 15,000 |  |
Maximum permitted annual purchases per employee, Percent of Compensation | 10.00% |  |
Shares sold to employees under employee stock purchase plan | 14,205 | 12,662 | 14,222
Shares purchased from employees at fair value | 12,455 | 12,460 | 15,594
2003 Comp Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum limit of the fees a Director can elect to receive in stock | 100.00% |  |
Accrued Director fees | $ 9,500,000 | $ 13,600,000 |
Accrued Director fees in shares | 17,990 | 17,990 |
Additional shares of stock or units | 0 |  |
2003 Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares for which each new non-employee director receives an option to purchase | 3,000 |  |
2003 Option Plan [Member] | Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding options | 19,000 | 24,000 |
Common stock reserved for future issuance | 0 |  |
Share based compensation grant date vesting period | 3 years |  |
Restated Executive Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for future issuance | 239,888 |  |
Maximum permitted annual purchases per employee, Percent of Compensation | 25.00% |  |
Shares sold to employees under employee stock purchase plan | 1,865 | 1,943 | 2,229
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise period of vested options after service period | 30 days |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise period of vested options after service period | 90 days |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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