Summary Of Significant Accounting Policies (Policy)	9 Months Ended
Summary Of Significant Accounting Policies (Policy)	Apr. 30, 2018
Significant Accounting Policies [Line Items]
Accounting estimates	Accounting estimates: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported period. Actual results could differ from these estimates. Significant estimates impacting the consolidated financial statements include accruals that have been established for contingent liabilities, pending claims and legal actions arising in the normal course of business, useful lives of property, plant and equipment assets, residual values of tanks, capitalization of customer tank installation costs, amortization methods of intangible assets, valuation methods used to value sales returns and allowances, allowance for doubtful accounts, fair value of reporting units, recoverability of long-lived assets, assumptions used to value business combinations, fair values of derivative contracts and stock-based compensation calculations.
New Accounting Pronouncements	New accounting standards: FASB Accounting Standard Update No. 2014-09 In May 2014, the Financial Accounting Standards Board, ("FASB") issued Accounting Standard Update ("ASU") 2014-09, Revenue from Contracts with Customers. The issuance is part of a joint effort by the FASB and the International Accounting Standards Board ("IASB") to enhance financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards ("IFRS") and, thereby, improving the consistency of requirements, comparability of practices and usefulness of disclosures. The new standard will supersede much of the existing authoritative literature for revenue recognition. The standard and related amendments will be effective for Ferrellgas for its annual reporting period beginning August 1, 2018, including interim periods within that reporting period. Entities are allowed to transition to the new standard by either recasting prior periods or recognizing the cumulative effect. Ferrellgas is in the final stages of analyzing the impact of the new guidance using an integrated approach which includes evaluating differences in the amount and timing of revenue recognition from applying the requirements of the new guidance, reviewing its accounting policies and practices, and assessing the need for changes to its processes, accounting systems and design of internal controls. Ferrellgas has completed the assessment of a significant number of its contracts with customers under the new guidance. Although Ferrellgas has not completed its assessment of the impact of the new guidance, it does not expect its adoption will have a material impact on its consolidated financial statements. Ferrellgas expects to utilize the modified retrospective transition method, which recognizes the cumulative effect upon adoption, when it adopts the new standard, effective August 1, 2018. FASB Accounting Standard Update No. 2015-11 In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, which requires that inventory within the scope of the guidance be measured at the lower of cost or net realizable value. We adopted ASU 2015-11 effective August 1, 2017. The adoption of this standard did not materially impact our consolidated financial statements. FASB Accounting Standard Update No. 2016-02 In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Ferrellgas is currently evaluating the impact of its pending adoption of ASU 2016-02 on the consolidated financial statements. Ferrellgas has formed an implementation team, completed training on the new standard, and is working on an initial assessment. FASB Accounting Standard Update No. 2016-13 In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) which requires financial assets measured at amortized cost basis to be presented at the net amount expected to be collected. This standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. Ferrellgas is currently evaluating the impact of its pending adoption of this standard on the consolidated financial statements. FASB Accounting Standard Update No. 2017-12 In August 2017, the FASB issued ASU 2017-12, Financial Instruments - Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities which is intended to improve the financial reporting for hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. This standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Ferrellgas is currently evaluating the impact of its pending adoption of this standard on the consolidated financial statements.
Ferrellgas, L.P. [Member]
Significant Accounting Policies [Line Items]
Accounting estimates	Accounting estimates: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported period. Actual results could differ from these estimates. Significant estimates impacting the consolidated financial statements include accruals that have been established for contingent liabilities, pending claims and legal actions arising in the normal course of business, useful lives of property, plant and equipment assets, residual values of tanks, capitalization of customer tank installation costs, amortization methods of intangible assets, valuation methods used to value sales returns and allowances, allowance for doubtful accounts, fair value of reporting units, recoverability of long-lived assets, assumptions used to value business combinations, fair values of derivative contracts and stock-based compensation calculations.
New Accounting Pronouncements	New accounting standards: FASB Accounting Standard Update No. 2014-09 In May 2014, the Financial Accounting Standards Board, ("FASB") issued Accounting Standard Update ("ASU") 2014-09, Revenue from Contracts with Customers. The issuance is part of a joint effort by the FASB and the International Accounting Standards Board ("IASB") to enhance financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards ("IFRS") and, thereby, improving the consistency of requirements, comparability of practices and usefulness of disclosures. The new standard will supersede much of the existing authoritative literature for revenue recognition. The standard and related amendments will be effective for Ferrellgas, L.P. for its annual reporting period beginning August 1, 2018, including interim periods within that reporting period. Entities are allowed to transition to the new standard by either recasting prior periods or recognizing the cumulative effect. Ferrellgas, L.P. is in the final stages of analyzing the impact of the new guidance using an integrated approach which includes evaluating differences in the amount and timing of revenue recognition from applying the requirements of the new guidance, reviewing its accounting policies and practices, and assessing the need for changes to its processes, accounting systems and design of internal controls. Ferrellgas, L.P. has completed the assessment of a significant number of its contracts with customers under the new guidance. Although Ferrellgas, L.P. has not completed its assessment of the impact of the new guidance, it does not expect its adoption will have a material impact on its consolidated financial statements. Ferrellgas, L.P. expects to utilize the modified retrospective transition method, which recognizes the cumulative effect upon adoption, when it adopts the new standard, effective August 1, 2018. FASB Accounting Standard Update No. 2015-11 In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330) - Simplifying the Measurement of Inventory, which requires that inventory within the scope of the guidance be measured at the lower of cost or net realizable value. We adopted ASU 2015-11 effective August 1, 2017. The adoption of this standard did not materially impact our consolidated financial statements. FASB Accounting Standard Update No. 2016-02 In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Ferrellgas, L.P. is currently evaluating the impact of our pending adoption of ASU 2016-02 on the consolidated financial statements. Ferrellgas, L.P. has formed an implementation team, completed training on the new standard, and is working on an initial assessment. FASB Accounting Standard Update No. 2016-13 In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) which requires financial assets measured at amortized cost basis to be presented at the net amount expected to be collected. This standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. Ferrellgas, L.P. is currently evaluating the impact of its pending adoption of this standard on the consolidated financial statements. FASB Accounting Standard Update No. 2017-12 In August 2017, the FASB issued ASU 2017-12, Financial Instruments - Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities which is intended to improve the financial reporting for hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. This standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Ferrellgas, L.P. is currently evaluating the impact of its pending adoption of this standard on the consolidated financial statements.