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.

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

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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

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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

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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

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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.

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- Definition

Defined Benefit Plan, Age Requirement Before Distribution Occurs

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- Definition

Defined Benefit Plan, Dollar Cap Liability Reduction

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Defined Benefit Plan, Service Requirement

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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)