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=58740216&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=58740216&loc=d3e1928-114920

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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.

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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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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

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

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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, Service Requirement

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- Definition

Amount of health premiums reimbursed to retirees in the calendar year.

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The number of years that the postretirement health care plan amendment will be amortized.

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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)