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Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 26, 2017 USD ($) | Aug. 31, 2019 USD ($) segment shares | Aug. 25, 2018 USD ($) shares | Aug. 26, 2017 USD ($) shares | Aug. 29, 2009 | Sep. 01, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of reporting segments | segment |  | 5 |  |  |  |
Certificates of deposit |  | $ 4,900,000 | $ 67,600,000 |  |  |
Percentage of revenues derived from route servicing fees |  | 91.60% |  |  |  |
Current assets related to deferred commissions |  | $ 12,400,000 |  |  |  |
Noncurrent assets related to deferred commissions |  | 50,300,000 |  |  |  |
Amortization expense related to deferred commissions |  | $ 11,800,000 |  |  |  |
Estimated service lives of rental merchandise, minimum |  | 6 months |  |  |  |
Estimated service lives of rental merchandise, maximum |  | 36 months |  |  |  |
Impairment charge of capitalized costs as part of ongoing CRM systems project |  |  | 55,800,000 | $ 55,800,000 |  |
Impairment of goodwill and definite-lived intangible assets |  | $ 0 | 0 | 0 |  |
Weighted average useful life |  | 11 years 3 months 18 days |  |  |  |
Discount rate, lower range |  | 1.50% |  |  |  |
Discount range, upper range |  | 2.00% |  |  |  |
Discount period, lower range |  | 10 years |  |  |  |
Discount period, upper range |  | 30 years |  |  |  |
Inflation rate |  | 3.00% |  |  |  |
Advertising costs |  | $ 3,600,000 | $ 2,800,000 | $ 3,700,000 |  |
Anti-dilutive securities excluded from calculation of diluted earnings per share (in shares) | shares |  | 8,325 | 4,972 | 16 |  |
Conversion of Class B Common Stock in to Common Stock |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Conversion ratio |  | 1 |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Expiration period |  | 10 years |  |  |  |
Stock Appreciation Rights (SARs) | Non-Employee Directors |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |
Stock Appreciation Rights (SARs) | Certain Share-based Awards Granted During Fiscal 2019, 2018 and 2017 to Non-employee Directors | Non-Employee Directors |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Expiration period |  | 8 years |  |  |  |
Minimum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Remaining lives |  | 1 year |  |  |  |
Credit adjusted risk-free rate |  | 7.00% |  |  |  |
Minimum | Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  | $ 40,000,000
Operating lease, liability |  |  |  |  |  | 40,000,000
Maximum |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Remaining lives |  | 25 years |  |  |  |
Credit adjusted risk-free rate |  | 7.50% |  |  |  |
Maximum | Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  | 50,000,000
Operating lease, liability |  |  |  |  |  | $ 50,000,000
Machinery and Equipment |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment charge of capitalized costs as part of ongoing CRM systems project | $ 55,800,000 |  |  |  |  |
Core Laundry Operations |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of revenues recognized over time |  | 95.80% |  |  |  |
Percentage of revenues recognized at a point in time |  | 4.20% |  |  |  |
Specialty Garments |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of revenues recognized over time |  | 82.70% |  |  |  |
Percentage of revenues recognized at a point in time |  | 17.30% |  |  |  |
First Aid |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of revenues recognized at a point in time |  | 100.00% |  |  |  |
Computer Software, Intangible Asset |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ 11,600,000 |  |  |
Customer contracts |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Weighted average useful life |  | 13 years 7 months 6 days |  |  |  |
Other intangible assets |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Weighted average useful life |  | 3 years 3 months 18 days |  |  |  |

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