Disclosures About Derivative Instruments and Hedging Activities (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2010	Jun. 30, 2011 Gallons	Jun. 30, 2010 Gallons
Disclosures About Derivative Instruments Hedging Activities (Textuals) [Abstract]
Number of gallons of propane hedged		145,000,000	148,400,000
Maximum Period of hedging exposure to variability in cash flows (months)		15 months
Weighted Average Length Of Time Hedge in Price Risk Cash Flow Hedge		7 months
Net gain associated with commodity price risk hedges expected to be reclassified into earnings during the next twelve months		$ 6,314
Number of unsettled interest rate protection agreements outstanding		0
Net losses associated with interest rate protection agreements expected to be reclassified into earnings during the next twelve months		538
The amounts of gains or losses recognized in income as a result of excluding from ineffectiveness testing, were not material		The amounts of gains or losses recognized in income as a result of excluding from ineffectiveness testing, were not material
Notional amount of long-term debt hedged with interest rate protection agreements	150,000
Loss due to discontinuance of cash flow hedge associated with interest rate protection agreements reflected in other income, net	$ 12,193