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Employee and Retiree Benefits (Postretirement Benefit Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 27, 2017	May 28, 2016	May 27, 2017	May 28, 2016
Compensation and Retirement Disclosure [Abstract]
Interest cost	$ 0	$ 58	$ 29	$ 269
Service cost	0	23	16	86
Amortization of prior service benfit	0	(2,008)	(40,444)	(5,728)
Amortization of net actuarial loss	0	415	15,648	1,197
Net periodic postretirement benefit income	0	(1,512)	(24,751)	(4,176)
Payments for postretirement health care	$ 0	$ 232	$ 68	$ 738

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- References

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The amount of gains or losses recognized in net periodic benefit cost.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(4)
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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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-Publisher FASB
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- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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