Derivative Instruments and Hedging Activities - Balance Sheet (Details) - USD ($)	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Derivatives, Fair Value [Line Items]
Gain (loss) recognized due to ineffectiveness	$ 0
Commodity derivatives propane swap assets	51,267,000	$ 94,244,000
Derivative Asset, Fair Value, Gross Asset	51,267,000	94,244,000
Commodity derivatives propane swap liabilities	12,960,000	4,458,000
Derivative Liability, Fair Value, Gross Liability	12,960,000	4,458,000
Price risk management asset
Derivatives, Fair Value [Line Items]
Commodity derivatives propane swap assets	43,015,000	78,001,000
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity derivatives propane swap liabilities	11,840,000	3,429,000
Other Assets, Net [Member]
Derivatives, Fair Value [Line Items]
Commodity derivatives propane swap assets	8,252,000	16,243,000
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity derivatives propane swap liabilities	$ 1,120,000	$ 1,029,000