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

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

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- Definition

[Line Items] for Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Table]

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Fixed Rate Bonds (Details) $ in Millions	Mar. 31, 2017 Swap	Sep. 30, 2016 Swap	Jun. 30, 2014 USD ($) Swap
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Number of Interest Rate Derivatives Held	0	8
2.6% due 2017 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Number of Interest Rate Derivatives Held			4
Notional amount \| $			$ 400
Debt Instrument, Interest Rate, Stated Percentage			2.60%
1.4% due 2018 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Number of Interest Rate Derivatives Held			3
Notional amount \| $			$ 300
Debt Instrument, Interest Rate, Stated Percentage			1.40%
7.125% due 2017 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Number of Interest Rate Derivatives Held			1
Notional amount \| $			$ 150
Debt Instrument, Interest Rate, Stated Percentage			7.125%