Schedule I Parent Only Statements - BALANCE SHEETS (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Mar. 30, 2021
ASSETS
Cash and cash equivalents	$ 96,883	$ 124,160	$ 137,347	$ 158,737
Prepaid expenses and other current assets	30,471	34,383
Total assets	1,416,716	1,458,750
LIABILITIES AND PARTNERS' DEFICIT
Other current liabilities	215,154	184,021
Partners' deficit
General partner unitholder	(70,845)	(70,080)
Accumulated other comprehensive (loss) income	(95)	2,025
Total Ferrellgas Partners, L.P. deficit	(1,020,632)	(941,989)
Total liabilities and partners' deficit	$ 1,416,716	$ 1,458,750
Limited partner unitholders, units outstanding					97,152,665
General partner unitholder, units outstanding	49,496	49,496
Class A Limited Partner Units
Partners' deficit
Limited partner unitholders	$ (1,332,704)	$ (1,256,946)
Limited partner unitholders, units outstanding	4,857,605	4,857,605			4,857,605
Class B Limited Partner Units
Partners' deficit
Limited partner unitholders	$ 383,012	$ 383,012
Limited partner unitholders, units outstanding	1,300,000	1,300,000
Parent Company [Member]
ASSETS
Cash and cash equivalents	$ 301	$ 428	$ 102	$ 271
Prepaid expenses and other current assets	82	20
Total assets	383	448
LIABILITIES AND PARTNERS' DEFICIT
Other current liabilities	592	125
Investment in Ferrellgas, L.P.	1,020,423	942,312
Partners' deficit
General partner unitholder	(70,845)	(70,080)
Accumulated other comprehensive (loss) income	(95)	2,025
Total Ferrellgas Partners, L.P. deficit	(1,020,632)	(941,989)
Total liabilities and partners' deficit	$ 383	$ 448
General partner unitholder, units outstanding	49,496	49,496
Parent Company [Member] | Class A Limited Partner Units
Partners' deficit
Limited partner unitholders	$ (1,332,704)	$ (1,256,946)
Limited partner unitholders, units outstanding	4,857,605	4,857,605
Parent Company [Member] | Class B Limited Partner Units
Partners' deficit
Limited partner unitholders	$ 383,012	$ 383,012
Limited partner unitholders, units outstanding	1,300,000	1,300,000