Employee Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended
Nov. 30, 2019 USD ($) Retirement-Plan	Nov. 24, 2018 USD ($)
Postemployment Benefits [Abstract]
Contributions charged to expense under the plan	$ 5.5	$ 4.5
Number of frozen non-contributory defined benefit pension plans \| Retirement-Plan	2
Amounts charged to expense related to the plans	$ 0.7	$ 0.5

Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration