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Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 23, 2019 USD ($) | Aug. 31, 2019 USD ($) site company | Aug. 25, 2018 USD ($) | Aug. 26, 2017 USD ($)
Gain Contingencies [Line Items] |  |  |  |
Total rent expense on all leases |  | $ 16.5 | $ 14.8 | $ 13.6
Estimated rate of inflation |  | 3.00% |  |
Annual proceeds |  | $ 0.3 |  |
Balance in escrow account |  | $ 4.2 |  |
Number of insurance companies | company |  | 3 |  |
Pre-tax non-cash impairment charge |  |  | 55.8 | $ 55.8
Gain (Loss) Related to Litigation Settlement | $ 21.1 | $ 21.1 |  |
One-time cash payment received for sale of CRM system | 13.0 | 13.0 |  |
Hardware received at fair value | $ 0.8 | 0.8 |  |
Outstanding letters of credit |  | $ 71.8 | $ 63.9 |
Minimum |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Risk-free interest rates utilized |  | 1.50% |  |
Maximum |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Risk-free interest rates utilized |  | 2.00% |  |
Williamstown, Vermont |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Number of sites related to former operations | site |  | 2 |  |

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