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New Accounting Pronouncements - Narrative (Details) - USD ($)	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017	Sep. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in cash flow from operating activities	$ (494,700,000)	$ (351,500,000)	$ (336,600,000)
Increase in cash flow from investing activities	(53,000,000.0)	(204,000,000.0)	(48,800,000)
Increase in operating profit	462,900,000	460,800,000	527,500,000
Increase in miscellaneous expense	(4,700,000)	(1,400,000)	(2,400,000)
Cumulative effect of applying ASC 606 in Retained Earnings				$ (13,000,000.0)
ASU 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from corporate-owned life insurance policies	800,000	1,700,000	0
Decrease in cash flow from operating activities		1,700,000
Increase in cash flow from investing activities		1,700,000
ASU 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in miscellaneous expense		1,400,000	2,400,000
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of applying ASC 606 in Retained Earnings				$ 13,000,000.0
Increase | ASU 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in operating profit		6,200,000	8,700,000
Increase in miscellaneous expense		$ 6,200,000	$ 8,700,000
Expect | Minimum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	63,000,000
Expect | Maximum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	$ 68,000,000

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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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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The net result for the period of deducting operating expenses from operating revenues.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash inflow for proceeds from settlement of corporate-owned life insurance policy, classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy.

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