Debt - Long-Term Debt Activity (Details) $ in Thousands | Apr. 05, 2021USD ($) | Mar. 30, 2021USD ($)item | Apr. 30, 2020USD ($) | Jan. 31, 2017USD ($) | Apr. 30, 2021USD ($)subsidiary | Apr. 30, 2020USD ($) | Jul. 31, 2014USD ($) | Jul. 31, 2020 | Jun. 30, 2015USD ($) | Mar. 31, 2011USD ($) | Nov. 30, 2010USD ($) | Apr. 30, 2010USD ($) |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of long-term debt | | | | | $ 1,475,000 | $ 703,750 | | | | | | |
Number Of Entity Subsidiaries | subsidiary | | | | | 2 | | | | | | | |
Prepayment premium paid | | | | | $ 85,026 | 17,516 | | | | | | |
Non-cash write-offs of unamortized debt discount and related capitalized debt costs | | | | | $ 109,922 | 37,399 | | | | | | |
Fixed rate, 6.5%, due 2021 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | $ 500,000 | |
Interest rate, as a percent | 6.50% | | | | | | | 6.50% | | | 6.50% | |
Outstanding borrowing repaid | $ 513,900 | | | | | | | | | | | |
Fixed rate, 6.75%, due 2023 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | $ 500,000 | | | |
Interest rate, as a percent | 6.75% | | | | | | | 6.75% | 6.75% | | | |
Outstanding borrowing repaid | $ 518,800 | | | | | | | | | | | |
Fixed rate, 6.75%, due 2022 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 475,000 | | | | | |
Interest rate, as a percent | 6.75% | | | | | | 6.75% | 6.75% | | | | |
Outstanding borrowing repaid | $ 482,000 | | | | | | | | | | | |
Fixed rate, 8.625%, due 2020 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | $ 357,000 | | $ 175,000 | | | | | | | | $ 280,000 |
Interest rate, as a percent | | 8.625% | | | | | | 8.625% | | | | 8.625% |
Issuance price as percent of par | | | | 96.00% | | | | | | | | |
Amount redeemed | | | | | | | | | | $ 98,000 | | |
Senior Notes 5.375 Percent Due 2026 And Senior Notes 5.875 Percent Due 2029 [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of long-term debt | | $ 1,446,500 | | | | | | | | | | |
Issuance price as percent of par | | 100.00% | | | | | | | | | | |
Number Of Entity Subsidiaries | item | | 2 | | | | | | | | | | |
Senior Notes 5.375 Percent Due 2026 [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | $ 650,000 | | | | | | | | | | |
Interest rate, as a percent | | 5.375% | | | 5.375% | | | | | | | |
Senior Notes 5.875 Percent Due 2029 [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | $ 825,000 | | | | | | | | | | |
Interest rate, as a percent | | 5.875% | | | 5.875% | | | | | | | |
Fixed rate 10.00% Due 2025 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | $ 700,000 | | | $ 700,000 | | | | | | |
Interest rate, as a percent | 10.00% | | 10.00% | | | 10.00% | | 10.00% | | | | |
Outstanding borrowing repaid | | $ 806,200 | | | | | | | | | | |
Revolving Credit Facility [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Debt Instrument, Term | | 4 years | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | $ 350,000 | | | | | | | | | | |
Sublimit, after initial period | | $ 200,000 | | | | | | | | | | |
Duration of initial period for sublimit | | 60 days | | | | | | | | | | |
Sublimit, initial period | | $ 225,000 | | | | | | | | | | |
Borrowing base, fixed portion | | $ 200,000 | | | | | | | | | | |
Additional capacity, percentage applied to accounts receivable | | 80.00% | | | | | | | | | | |
Additional capacity, percentage applied to inventory | | 70.00% | | | | | | | | | | |
Revolving Credit Facility [Member] | Base Rate [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Interest rate, as a percent | | 0.50% | | | | | | | | | | |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Interest rate, as a percent | | 1.00% | | | | | | | | | | |
Revolving Credit Facility [Member] | Maximum [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Undrawn funds fee (as a percent) | | 0.50% | | | | | | | | | | |
Revolving Credit Facility [Member] | Minimum [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Undrawn funds fee (as a percent) | | 0.375% | | | | | | | | | | |
Eurodollar Loans [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 3.00% | | | | | | | | | | |
Eurodollar Loans [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 2.50% | | | | | | | | | | |
Non-Eurodollar Loans [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 2.00% | | | | | | | | | | |
Non-Eurodollar Loans [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 1.50% | | | | | | | | | | |
Debt Instrument Issued At Par [Member] | Fixed rate, 6.75%, due 2022 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 325,000 | | | | | |
Debt Instrument Issued At Par [Member] | Fixed rate 10.00% Due 2025 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | $ 575,000 | | | $ 575,000 | | | | | | |
Debt Instrument Issued At Other Than Par [Member] | Fixed rate, 6.75%, due 2022 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 150,000 | | | | | |
Issuance price as percent of par | | | | | | | 104.00% | | | | | |
Debt Instrument Issued At Other Than Par [Member] | Fixed rate 10.00% Due 2025 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | $ 125,000 | | | 125,000 | | | | | | |
Issuance price as percent of par | | | 103.00% | | | | | | | | | |
Ferrellgas, L.P. [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of long-term debt | | | | | $ 1,475,000 | 703,750 | | | | | | |
Number Of Entity Subsidiaries | item | | 2 | | | | | | | | | | |
Prepayment premium paid | | | | | 83,072 | 17,516 | | | | | | |
Non-cash write-offs of unamortized debt discount and related capitalized debt costs | | | | | $ 107,968 | 37,399 | | | | | | |
Ferrellgas, L.P. [Member] | Fixed rate, 6.5%, due 2021 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | $ 500,000 | |
Interest rate, as a percent | | 6.50% | | | | | | 6.50% | | | 6.50% | |
Outstanding borrowing repaid | $ 513,900 | | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Fixed rate, 6.75%, due 2023 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | $ 500,000 | | | |
Interest rate, as a percent | | 6.75% | | | | | | 6.75% | 6.75% | | | |
Outstanding borrowing repaid | 518,800 | | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Fixed rate, 6.75%, due 2022 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 475,000 | | | | | |
Interest rate, as a percent | | 6.75% | | | | | 6.75% | 6.75% | | | | |
Outstanding borrowing repaid | $ 482,000 | | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Fixed rate, 8.625%, due 2020 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | $ 357,000 | | | | | | | | | | |
Interest rate, as a percent | | 8.625% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Senior Notes 5.375 Percent Due 2026 And Senior Notes 5.875 Percent Due 2029 [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of long-term debt | | $ 1,446,500 | | | | | | | | | | |
Issuance price as percent of par | | 100.00% | | | | | | | | | | |
Number Of Entity Subsidiaries | item | | 2 | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Senior Notes 5.375 Percent Due 2026 [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | $ 650,000 | | | | | | | | | | |
Interest rate, as a percent | | 5.375% | | | 5.375% | | | | | | | |
Ferrellgas, L.P. [Member] | Senior Notes 5.875 Percent Due 2029 [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | $ 825,000 | | | | | | | | | | |
Interest rate, as a percent | | 5.875% | | | 5.875% | | | | | | | |
Ferrellgas, L.P. [Member] | Fixed rate 10.00% Due 2025 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | $ 700,000 | | | $ 700,000 | | | | | | |
Interest rate, as a percent | | 10.00% | 10.00% | | 10.00% | 10.00% | | | | | | |
Outstanding borrowing repaid | | $ 806,200 | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Revolving Credit Facility [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Debt Instrument, Term | | 4 years | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | $ 350,000 | | | | | | | | | | |
Sublimit, after initial period | | $ 200,000 | | | | | | | | | | |
Duration of initial period for sublimit | | 60 days | | | | | | | | | | |
Sublimit, initial period | | $ 225,000 | | | | | | | | | | |
Borrowing base, fixed portion | | $ 200,000 | | | | | | | | | | |
Additional capacity, percentage applied to accounts receivable | | 80.00% | | | | | | | | | | |
Additional capacity, percentage applied to inventory | | 70.00% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Interest rate, as a percent | | 0.50% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Interest rate, as a percent | | 1.00% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Revolving Credit Facility [Member] | Maximum [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Undrawn funds fee (as a percent) | | 0.50% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Revolving Credit Facility [Member] | Minimum [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Undrawn funds fee (as a percent) | | 0.375% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Eurodollar Loans [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 3.00% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Eurodollar Loans [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 2.50% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Non-Eurodollar Loans [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 2.00% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Non-Eurodollar Loans [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Margin added to variable rate (as a percent) | | 1.50% | | | | | | | | | | |
Ferrellgas, L.P. [Member] | Debt Instrument Issued At Par [Member] | Fixed rate, 6.75%, due 2022 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 325,000 | | | | | |
Ferrellgas, L.P. [Member] | Debt Instrument Issued At Par [Member] | Fixed rate 10.00% Due 2025 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | $ 575,000 | | | $ 575,000 | | | | | | |
Ferrellgas, L.P. [Member] | Debt Instrument Issued At Other Than Par [Member] | Fixed rate, 6.75%, due 2022 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 150,000 | | | | | |
Issuance price as percent of par | | | | | | | 104.00% | | | | | |
Ferrellgas, L.P. [Member] | Debt Instrument Issued At Other Than Par [Member] | Fixed rate 10.00% Due 2025 | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | $ 125,000 | | | $ 125,000 | | | | | | |
Issuance price as percent of par | | | 103.00% | | | | | | | | | |