Contingent Liabilities and Commitments - Repurchase Commitments Narrative (Details) - USD ($) $ in Millions	9 Months Ended
May 30, 2020	Aug. 31, 2019
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Repurchase agreement term	24 months
Percentage of dealer invoice that liability cannot exceed	100.00%
Accrued loss on repurchases	$ 1.2	$ 0.9
Obligation to Repurchase from Dealers
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Contingent liability on repurchase agreements	$ 1,200.0	$ 874.9

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant