Fair Value Measurements (Summary Of Unobservable Inputs For Level 3 Fair Value Measurements) (Details)	9 Months Ended
	Jun. 30, 2018 USD ($)
Oil Costless Collars [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Input	Oil price volatility curve
Fair Value Assets (Liabilities)	$ (1,119,628)
Oil Costless Collars [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	0
Oil Costless Collars [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	31.24
Oil Costless Collars [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	17.16
Natural Gas Costless Collars [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Input	Gas price volatility curve
Fair Value Assets (Liabilities)	$ 6,310
Natural Gas Costless Collars [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	0
Natural Gas Costless Collars [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	16.25
Natural Gas Costless Collars [Member] | Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	9.08