Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
Nov. 18, 2017	Nov. 19, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension liability adjustments, taxes	$ 1,161	$ 1,385
Unrealized gains (losses) on marketable securities, taxes	170	144
Net derivative activities, taxes	186	179
Reclassified from Accumulated Other Comprehensive Income [Member] \| Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension liability adjustments, taxes	1,161	1,385
Reclassified from Accumulated Other Comprehensive Income [Member] \| Net Unrealized Gain (Loss) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on marketable securities, taxes	1	3
Reclassified from Accumulated Other Comprehensive Income [Member] \| Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net derivative activities, taxes	$ 186	$ 179

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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- Definition

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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