Capitalized Costs (Details) - USD ($)	Jun. 30, 2016	Sep. 30, 2015
Capitalized Costs [Abstract]
Cost of Non-Producing Oil and Natural Gas Properties	$ 5,917	$ 1,762

Cost of non-producing oil and natural gas properties.

No definition available.

Name:	phx_CostOfNonProducingOilAndNaturalGasProperties
Namespace Prefix:	phx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant