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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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.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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- Definition

The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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No definition available.

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Long-Term Debt - Derivatives - Additional Information (Details)	9 Months Ended
	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jan. 20, 2015 USD ($) swap
Debt Instrument [Line Items]
Ineffectiveness associated with swap	$ 0
Amount excluded from ineffectiveness testing	0
NMH Investment \| Interest Rate Swap
Debt Instrument [Line Items]
Number of interest rate swap agreements \| swap			2
Interest rate swap in a notional amount			$ 375,000,000
Payments on fixed rate			1.795%
Derivative liability	$ 900,000	$ 6,000,000
Minimum \| NMH Investment \| Interest Rate Swap
Debt Instrument [Line Items]
Minimum interest received from counter party			1.00%