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Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 27, 2016 USD ($) | Aug. 26, 2017 USD ($) site company | Aug. 27, 2016 USD ($) | Aug. 29, 2015 USD ($)
Gain Contingencies [Line Items] |  |  |  |
Total rent expense on all leases |  | $ 13.6 | $ 10.1 | $ 9.8
Estimated rate of inflation |  | 3.00% |  |
Risk-free interest rates utilized, lower range |  | 2.20% |  |
Risk-free interest rates utilized, upper range |  | 2.80% |  |
Annual proceeds |  | $ 0.3 |  |
Balance in escrow account |  | $ 3.7 |  |
Number of insurance companies | company |  | 3 |  |
Outstanding letters of credit | $ 53.0 | $ 66.2 | $ 53.0 |
Selling and Administrative Expenses |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Gain related to environmental litigation settlement | $ 15.9 |  |  |
Williamstown, Vermont |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Number of sites related to former operations | site |  | 3 |  |

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- Definition Rate applied, at lower range, to the undiscounted amount of environmental loss contingencies at an individual site to arrive at the present value recorded as of the balance sheet date. + References No definition available. + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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