Transactions with related parties (Details) $ in Thousands	3 Months Ended	9 Months Ended
Apr. 30, 2024 USD ($) employee	Apr. 30, 2023 USD ($)	Apr. 30, 2024 USD ($) employee	Apr. 30, 2023 USD ($)
Transactions with related parties
Number of employees \| employee	0		0
Ferrellgas Inc., General Partner
Transactions with related parties
Operating expense	$ 79,681	$ 77,876	$ 246,904	$ 233,585
General and administrative expense	$ 8,435	$ 7,869	$ 26,113	$ 23,528

Amount of expense for investment management fee, including, but not limited to, expense in connection with research, selection, supervision, and custody of investment.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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