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Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments: - USD ($)	Mar. 31, 2018	Aug. 31, 2017
Interest rate swaps
Notional Disclosures
Notional amount of interest rate swaps	$ 500,000,000
May 2019
Notional Disclosures
Notional amount of interest rate swaps	100,000,000
May 2020
Notional Disclosures
Notional amount of interest rate swaps	100,000,000
March 2022
Notional Disclosures
Notional amount of interest rate swaps	$ 300,000,000	$ 300,000,000.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- References

No definition available.

+ Details

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- Details

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- Details

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- Details

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