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Employee and Retiree Benefits (Postretirement Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012 | Nov. 28, 2015 | Dec. 31, 2016 | Aug. 27, 2016 | Aug. 29, 2015 | Aug. 30, 2014 | Aug. 27, 2005
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dollar cap liability reduction |  | 10.00% | 10.00% | 10.00% | 10.00% |  |  |  | 10.00% |  |
Liability reduction due to plan amendment |  | $ (3,960,000) | $ (3,580,000) | $ (4,289,000) | $ (4,598,000) |  |  |  | $ (3,960,000) | $ (3,580,000) | $ (40,414,000)
Amortization period |  | 7 years 1 month 6 days | 7 years 4 months | 7 years 6 months | 7 years 9 months 20 days |  |  |  |  |  | 11 years 6 months
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 |  |  |  |  |  |  |  |  | 4.15% | 3.89% |
Actuarial (gain) loss |  |  |  |  |  |  |  |  | $ 684,000 | $ 3,368,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Health reimbursement account |  |  |  |  |  |  | $ 700,000 |  |  |  |
Dollar cap liability reduction | 10.00% |  |  |  |  |  |  |  |  |  |
Liability reduction due to plan amendment |  |  |  |  |  | $ 29,000,000 |  |  |  |  |
Amortization period |  |  |  |  |  | 6 years 10 months 24 days |  |  |  |  |
Prior service cost (credit) |  |  |  |  |  |  |  | $ (7,700,000) |  |  |
Actuarial net gains (losses) |  |  |  |  |  |  |  | $ (1,600,000) |  |  |

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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=58740216&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=58740216&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 The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 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)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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