Debt Instrument Maturity Dates

No definition available.

Name:	fgp_DebtInstrumentMaturityDates
Namespace Prefix:	fgp_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherLongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt (Secured Credit Facility Narrative) (Details) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Debt Instrument [Line Items]
Commitment fee payable rate	0.50%
Letters of credit outstanding	$ 53,900,000	$ 64,500,000
Letter of credit facility, remaining capacity	146,100,000	135,500,000
Line of credit facility, commitment fee	900,000	900,000	1,100,000
Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Commitment fee payable rate	0.50%
Letters of credit outstanding	53,900,000	64,500,000
Letter of credit facility, remaining capacity	146,100,000	135,500,000
Line of credit facility, commitment fee	900,000	900,000	1,100,000
Letter Of Credit [Member]
Debt Instrument [Line Items]
Secured line of credit facility	200,000,000.0
Letter Of Credit [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Secured line of credit facility	200,000,000.0
Secured Credit Facility [Member]
Debt Instrument [Line Items]
Secured credit facility maturity period	5 years
Debt instrument, maturity date	September 2016
Secured line of credit facility	400,000,000.0
Total borrowings outstanding, line of credit facility	171,400,000	160,000,000
Amount classified as long-term debt	121,300,000	64,300,000
Weighted average interest rate of debt	3.70%	4.20%
Debt instrument, basis spread rate	1.75%	2.00%
Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Secured credit facility maturity period	5 years
Debt instrument, maturity date	September 2016
Secured line of credit facility	400,000,000.0
Total borrowings outstanding, line of credit facility	171,400,000	160,000,000
Amount classified as long-term debt	$ 121,300,000	$ 64,300,000
Weighted average interest rate of debt	3.70%	4.20%
Debt instrument, basis spread rate	1.75%	2.00%
Reductions from Previous Facility Rates [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest Rate, minimum	1.25%
Interest Rate, maximum	1.50%
Reductions from Previous Facility Rates [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Interest Rate, minimum	1.25%
Interest Rate, maximum	1.50%
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Credit facility interest rate	0.09%	0.13%
Federal Funds Rate [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Credit facility interest rate	0.09%	0.13%
Federal Funds Rate [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	0.50%
Federal Funds Rate [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	0.50%
Eurodollar Rate Loan [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	1.00%
Eurodollar Rate Loan [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	1.00%
Euro Rate [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	2.75%	3.00%
Euro Rate [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	2.75%	3.00%
Bank Of America's Prime Rate [Member]
Debt Instrument [Line Items]
Credit facility interest rate	3.25%	3.25%
Bank Of America's Prime Rate [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Credit facility interest rate	3.25%	3.25%
One-Month Eurodollar Rate [Member]
Debt Instrument [Line Items]
Credit facility interest rate	0.22%	0.31%
One-Month Eurodollar Rate [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Credit facility interest rate	0.22%	0.31%
Three-Month Eurodollar Rate [Member]
Debt Instrument [Line Items]
Credit facility interest rate	0.28%	0.43%
Three-Month Eurodollar Rate [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Credit facility interest rate	0.28%	0.43%
Minimum [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	1.00%
Minimum [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	1.00%
Minimum [Member] \| Euro Rate [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	2.00%
Minimum [Member] \| Euro Rate [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	2.00%
Maximum [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	2.00%
Maximum [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	2.00%
Maximum [Member] \| Euro Rate [Member] \| Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	3.00%
Maximum [Member] \| Euro Rate [Member] \| Secured Credit Facility [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread rate	3.00%