Inventories (Details Textual)	12 Months Ended
	Sep. 30, 2012 gal	Sep. 30, 2011 gal
Components of Inventory (Additional Textual) [Abstract]
Heating oil and other fuel inventories	9,400,000	20,800,000
Market price based product supply contracts for next twelve months	219,000,000
Maximum Product supply by other supplier	10.00%	10.00%
Global Companies LLC [Member]
Inventory Suppliers [Line Items]
Product purchases	24.00%	21.60%
NIC Holding Corp [Member]
Inventory Suppliers [Line Items]
Product purchases	9.00%	12.60%
Sunoco Inc [Member]
Inventory Suppliers [Line Items]
Product purchases		10.90%
JPMorgan Ventures Energy Corporation [Member]
Inventory Suppliers [Line Items]
Product purchases	9.00%