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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
Retirement Benefits [Abstract]
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%
Actuarial loss						$ 0	$ 850
Dollar cap liability reduction	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%
Defined Benefit Plan, Retiree Age Requirement						65 years

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit 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=82843861&loc=d3e1928-114920

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Defined Benefit Plan, Age Requirement Before Distribution Occurs

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Defined Benefit Plan, Dollar Cap Liability Reduction

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Defined Benefit Plan, Retiree Age Requirement

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Defined Benefit Plan, Service Requirement

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