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Employee and Retiree Benefits (Postretirement Benefit Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 26, 2017	Aug. 27, 2016	Aug. 29, 2015
Retirement Benefits [Abstract]
Interest cost	$ 29	$ 327	$ 1,382
Service cost	16	108	427
Amortization of prior service benfit	(40,444)	(7,736)	(5,538)
Amortization of net actuarial loss	15,648	1,612	1,465
Net periodic postretirement benefit income	$ (24,751)	$ (5,689)	$ (2,264)

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Amount of gain (loss) recognized in net periodic benefit (cost) credit 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
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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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