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Impairment and other charges, net Restructuring cost (Details) - USD ($) $ in Thousands | 4 Months Ended
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Jan. 20, 2019 | Jan. 21, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost Remaining |  | $ 1,600 |
Restructuring Costs |  | 5,840 | $ 358
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Costs | [1] | 4,506 | (456)
Strategic Alternative Evaluation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Costs | [2] | 1,334 | 0
Qdoba evaluation cost [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Costs | [3] | 0 | 813
Other Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Costs |  | $ 0 | $ 1
[1] | 2018 reflects a reduction in severance and related costs due to a change in the number of employees to be terminated in connection with our restructuring activities.
[2] | Strategic Alternative Evaluation costs are primarily related to third party advisory services.
[3] | Qdoba Evaluation costs are primarily related to retention compensation and third party advisory services.

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- Definition Amount of expected cost remaining for the specified restructuring cost. + References No definition available. + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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