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Employee and Retiree Benefits Postretirement health care liability reduction due to plan amendments (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012 | Aug. 29, 2015 | Aug. 30, 2014 | Aug. 27, 2005
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |  |  |
Dollar cap liability reduction | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% |  |
Liability reduction due to plan amendment | $ 3,960 | $ 3,580 | $ 4,289 | $ 4,598 | $ 3,960 | $ 3,580 | $ 40,414
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

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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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- Definition Defined Benefit Plan, Dollar Cap Liability Reduction + References No definition available. + Details
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- Definition The number of years that the postretirement health care plan amendment will be amortized. + References No definition available. + Details
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