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Derivatives, Investments and Fair Value Measurements (Fair Value Inputs) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Aug. 25, 2018 | Aug. 26, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Domestic equity funds | $ 1,143 | $ 1,708
International equity funds | 139 | 174
Fixed income funds | 223 | 259
Interest rate swap contract, asset | 1,959 |
Interest rate swap contract, liability |  | (828)
Total assets (liabilities) at fair value | 3,464 | 1,313
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Domestic equity funds | 1,114 | 1,671
International equity funds | 120 | 157
Fixed income funds | 132 | 170
Interest rate swap contract, asset | 0 |
Interest rate swap contract, liability |  | 0
Total assets (liabilities) at fair value | 1,366 | 1,998
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Domestic equity funds | 29 | 37
International equity funds | 19 | 17
Fixed income funds | 91 | 89
Interest rate swap contract, asset | 1,959 |
Interest rate swap contract, liability |  | (828)
Total assets (liabilities) at fair value | 2,098 | (685)
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Domestic equity funds | 0 | 0
International equity funds | 0 | 0
Fixed income funds | 0 | 0
Interest rate swap contract, asset | 0 |
Interest rate swap contract, liability |  | 0
Total assets (liabilities) at fair value | $ 0 | $ 0

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