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Debt - Energy Services (Details) - Energy Services	1 Months Ended	6 Months Ended
	Feb. 29, 2016 USD ($)	Oct. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Sep. 30, 2016	Sep. 30, 2015
Energy Services Credit Agreement
Debt Instrument
Maximum ratio of Total Indebtedness to EBITDA				3.50
Minimum ratio of EBITDA to interest expense				3.50
Energy Services Receivables Facility | Receivables Facility
Debt Instrument
Maximum borrowing capacity			$ 150,000,000
Energy Services Receivables Facility | Receivables Facility | Subsequent Event
Debt Instrument
Maximum borrowing capacity		$ 75,000,000
Line of Credit | Energy Services Credit Agreement
Debt Instrument
Maximum borrowing capacity	$ 240,000,000
Basis spread on variable rate (percentage)	2.25%
Weighted-average interest rate					2.75%
Line of Credit | Energy Services Credit Agreement | Maximum
Debt Instrument
Ratio of Consolidated Indebtedness to EBITDA	3.00
Line of Credit | Energy Services Credit Agreement | Federal Funds Rate
Debt Instrument
Basis spread on variable rate (percentage)	0.50%
Line of Credit | Energy Services Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate (percentage)	1.00%
Line of Credit | Energy Services Credit Agreement | Letter of Credit
Debt Instrument
Maximum borrowing capacity	$ 50,000,000

X

- Definition

Debt Instrument, Covenant, EBITDA to Interest Expense Ratio, Minimum

+ References

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Ratio of consolidated total indebtedness to EBITDA.

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- Definition

The effective interest rate at the end of the reporting period.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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