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Employee and Retiree Benefits (Postretirement Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012 | Aug. 26, 2017 | Aug. 27, 2016 | Aug. 29, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Postretirement health care benefits age requirement before distribution occurs |  |  |  |  |  |  | 55 years |
Postretirement health care benefits continuous service requirement |  |  |  |  |  |  | 15 years |
Accumulated postretirement benefit obligation discount rate |  |  |  |  |  |  | 2.73% | 4.15%
Actuarial loss |  |  |  |  |  |  | $ 850 | $ 684
Dollar cap liability reduction | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% |  | 10.00% |
Defined Benefit Plan, Retiree Age Requirement |  |  |  |  |  |  | 65 years |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  |  |  |  | $ (6,400) |  |
Actuarial net loss |  |  |  |  |  | $ (1,600) |  |

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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Defined Benefit Plan, Age Requirement Before Distribution Occurs + References No definition available. + Details
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