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Fair Value Measurements (Details) - USD ($) $ in Millions	Nov. 30, 2019	Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 266.6	$ 461.0
Carrying Value | Senior unsecured public notes, net of unamortized discount and deferred costs
Liabilities:
Carrying and estimated fair values of financial instruments	350.0	349.9
Carrying Value | Industrial revenue bond | Industrial Revenue Bond Maturing in 2021
Liabilities:
Carrying and estimated fair values of financial instruments	4.0	4.0
Carrying Value | Bank loans
Liabilities:
Carrying and estimated fair values of financial instruments	2.3	2.7
Fair Value | Level 2 | Senior unsecured public notes, net of unamortized discount and deferred costs
Liabilities:
Carrying and estimated fair values of financial instruments	350.1	352.7
Fair Value | Level 2 | Industrial revenue bond | Industrial Revenue Bond Maturing in 2021
Liabilities:
Carrying and estimated fair values of financial instruments	4.0	4.0
Fair Value | Level 2 | Bank loans
Liabilities:
Carrying and estimated fair values of financial instruments	$ 2.4	$ 2.9

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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