Supplemental Financial Statement Information - Narrative (Details) $ in Thousands, gal in Millions	6 Months Ended
Jan. 31, 2019 USD ($) gal	Jul. 31, 2018 USD ($)
Supplemental Financial Statement Information [Line Items]
Notes, Loans and Financing Receivable, Net, Noncurrent \| $	$ 27,646	$ 27,491
Maximum term of supply procurement contracts	36 months
Net procurement of fixed priced propane by Ferrellgas in gallons \| gal	14.0
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Notes, Loans and Financing Receivable, Net, Noncurrent \| $	$ 27,646	$ 27,491
Maximum term of supply procurement contracts	36 months
Net procurement of fixed priced propane by Ferrellgas in gallons \| gal	14.0

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant