Revenue from contracts with customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts receivable collection period	30 days
Residential customer, annual cost spread period	12 months
Rental income recognition period	1 year
Revenues	$ 2,114,540	$ 1,754,310	$ 1,497,826
Contract assets and liabilities
Contract assets	11,935	10,074
Contract liabilities
Deferred revenue	47,929	49,354
Deferred revenue recognized	41,500
Propane And Related Equipment [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,114,540	1,754,310	1,497,826
Retail Sales To End Users [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,446,857	1,123,956	964,087
Wholesale Sales To Resellers [Member]
Disaggregation of Revenue [Line Items]
Revenues	549,058	516,599	430,435
Other Gas Sales [Member]
Disaggregation of Revenue [Line Items]
Revenues	21,964	28,297	21,269
Other Revenues
Disaggregation of Revenue [Line Items]
Revenues	96,661	85,458	82,035
Ferrellgas, L.P. [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,114,540	1,754,310	1,497,826
Ferrellgas, L.P. [Member] | Other Revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 96,661	$ 85,458	$ 82,035