Rendering

Component: (Network and Table)
Network
40201 - Disclosure - Asset Retirement Obligations (Details)
(http://www.natfuel.com/role/DisclosureAssetRetirementObligationsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Asset Retirement Obligations [Abstract]Period [Axis]
2012-10-01 - 2013-09-30
2011-10-01 - 2012-09-30
2010-10-01 - 2011-09-30
Asset Retirement Obligations [Abstract]
 
 
 
Balance at Beginning of Year
119,246,000  
75,731,000  
101,618,000  
Liabilities Incurred and Revisions of Estimates
(4,796,000) 
41,653,000  
10,346,000  
Liabilities Settled
(1,744,000) 
(2,997,000) 
(41,704,000) 
Accretion Expense
6,805,000  
4,859,000  
5,471,000  
Balance at End of Year
119,511,000  
 
119,246,000  
 
75,731,000