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Significant Accounting Policies - Selling, Distribution and Administrative Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Accounting Policies [Abstract]
Other shipping and handling costs	$ 121.9	$ 138.4	$ 154.9
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share-based payment expense	38.2	29.2	32.3
Income tax benefit for share-based compensation	6.6	6.5	8.4
Net excess tax expense (benefit) related to share-based payment cost	1.4	1.6	0.8
Research and development expense	82.0	74.7	63.9
Advertising costs	$ 15.1	$ 18.5	$ 20.6

X

- Definition

Shipping and handling cost incurred during the reporting period, excluding fees billed to customers and costs associated with inbound freight and freight between manufacturing facilities.

+ References

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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