Fair Value Measurements - Assets and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 31, 2022	Jul. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity derivatives propane swap assets	$ 27,614	$ 51,267
Commodity derivatives propane swap liabilities	(38,280)	(12,960)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity derivatives propane swap assets	0	0
Commodity derivatives propane swap liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity derivatives propane swap assets	27,614	51,267
Commodity derivatives propane swap liabilities	(38,280)	(12,960)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity derivatives propane swap assets	0	0
Commodity derivatives propane swap liabilities	$ 0	$ 0