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Share-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 21, 2016 | Oct. 27, 2014 | May 27, 2017 | Aug. 25, 2018 | Aug. 26, 2017 | Aug. 27, 2016 | Aug. 29, 2009 | Oct. 30, 2010 | Nov. 30, 1996
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Closing share price (in dollars per share) | $ 111.13 |  |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage vested after each anniversary of the grant date |  |  |  | 20.00% |  |  |  |  |
Period awards become fully vested or exercisable |  |  |  | 5 years |  |  |  |  |
Expiration period |  |  |  | 10 years |  |  |  |  |
Weighted average fair values of Share-Based Awards granted (in dollars per share) |  |  |  | $ 47.51 | $ 34.74 | $ 35.81 |  |  |
Time-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Period awards become fully vested or exercisable |  |  |  | 5 years |  |  |  |  |
Time-Based Restricted Stock Units | Tranche One |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage vested after each anniversary of the grant date |  |  |  | 20.00% |  |  |  |  |
Period awards become fully vested or exercisable |  |  |  | 5 years |  |  |  |  |
Time-Based Restricted Stock Units | Tranche Two |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage vested after each anniversary of the grant date |  |  |  | 33.00% |  |  |  |  |
Period awards become fully vested or exercisable |  |  |  | 3 years |  |  |  |  |
Time-Based Restricted Stock Units | Tranche Three |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Period awards become fully vested or exercisable |  |  |  | 5 years |  |  |  |  |
Share-Based Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total compensation cost not yet recognized related to non-vested awards |  |  |  | $ 9.1 |  |  |  |  |
Period for recognition |  |  |  | 2 years 1 month 6 days |  |  |  |  |
Non-Employee Directors |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration period |  |  |  | 8 years |  |  |  |  |
Potential expiration period, period post date Director ceases to be a member of the Board of Directors |  |  |  | 2 years |  |  |  |  |
Non-Employee Directors | Unrestricted Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 234 | 735 | 885 |  |  |
Non-Employee Directors | Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration period |  |  |  | 8 years |  |  | 10 years |  |
Potential expiration period, period post date Director ceases to be a member of the Board of Directors |  |  |  | 2 years |  |  |  |  |
The 1996 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 1,500,000
The 2010 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance (in shares) |  |  |  |  |  |  |  | 600,000 |
Number of additional shares reserved for issuance (in shares) |  | 750,000 |  |  |  |  |  |  |
Shares available for future grants (in shares) |  |  |  | 475,045 |  |  |  |  |
The 2010 Plan | Non-Employee Directors | Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 5,000 | 4,940 | 6,675 |  |  |
Restricted Stock Award Agreement | Mr. Croatti |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expense recognized |  |  |  |  | $ 8.8 |  |  |  |
Expense recognized due to accelerated vesting |  |  | $ 5.4 |  | $ 5.4 |  |  |  |
Restricted Stock Award Agreement | Mr. Croatti | Performance Restricted Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) | 140,000 |  |  |  |  |  |  |  |
Shares forfeited (in shares) |  |  | 46,666 |  |  |  |  |  |
Shares earned in the performance period (in shares) |  |  |  |  | 22,333 |  |  |  |
Restricted Stock Award Agreement | Mr. Croatti | Performance Restricted Shares | Class B Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares vested (in shares) |  |  | 46,667 |  |  |  |  |  |
Shares earned in the performance period (in shares) |  |  |  |  | 24,334 |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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