Fair value measurements (Tables)

3 Months Ended

Oct. 31, 2023

Fair value measurements

Schedule of assets and liabilities fair value hierarchy

	Asset (Liability)
	Quoted Prices in Active
	Markets for Identical		Significant Other
	Assets and Liabilities		Observable Inputs		Unobservable Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
October 31, 2023:
Assets:
Derivative financial instruments:
Commodity derivatives	$	—	$	6,513	$	—	$	6,513
Liabilities:
Derivative financial instruments:
Commodity derivatives	$	—	$	(15,718)	$	—	$	(15,718)
July 31, 2023:
Assets:
Derivative financial instruments:
Commodity derivatives	$	—	$	12,165	$	—	$	12,165
Liabilities:
Derivative financial instruments:
Commodity derivatives	$	—	$	(11,082)	$	—	$	(11,082)