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Financial Instruments and Risk Management - Interest Rate Risk (Details)	Aug. 31, 2017 USD ($)
Financial instruments and risk management
Floating rate debt	$ 428,700,000
3.90% unsecured Senior Notes payable
Financial instruments and risk management
Fixed rate debt	$ 20,000,000
Fixed interest rate (as a percent)	3.90%

X

- Definition

The portion of the aggregate carrying amount of short-term and long-term borrowings (including current maturities) outstanding as of the balance sheet date which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

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X

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

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