Long Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 23, 2012	Sep. 24, 2011
Debt Instrument [Line Items]
Long-term borrowings	$ 348,331	$ 348,169
Interest rate swap agreement [Abstract]
Notional amount	100,000
Effective date	Mar. 31, 2010
Termination date	Jun. 25, 2013
Fixed interest rate (in hundredths)	3.12%
Credit Agreement and 2020 Senior Notes covenants [Abstract]
Total consolidated interest coverage ratio, minimum	2.5 to 1.0
Total consolidated leverage ratio, maximum	4.75 to 1.0
Senior secured consolidated leverage ratio, maximum	3.0 to 1.0
Consolidated fixed charge coverage ratio, minimum	1.75 to 1
Debt Origination Costs [Abstract]
Loss on the extinguishment of debt related to write-off in unamortized debt origination costs and unamortized discount	507
Capitalized debt origination costs	9,747	7,207
Long-term debt maturities [Abstract]
Long-term debt maturities, 2012	0
Long-term debt maturities, 2013	0
Long-term debt maturities, 2014	0
Long-term debt maturities, 2015	0
Long-term debt maturities, 2016	0
Long-term debt maturities thereafter	350,000
Acquisition of Inergy Propane LLC [Member]
Debt Origination Costs [Abstract]
Capitalized debt origination costs	1,772
Revolving credit facility [Member]
Debt Instrument [Line Items]
Long-term borrowings	100,000	100,000
Standby letters of credit issued under the Revolving Credit Facility	46,926	100,000
Available borrowing capacity under Revolving Credit Facility	103,074
Interest rate swap agreement [Abstract]
Revolving Credit Facility, interest rate description	Borrowings under the Revolving Credit Facility bear interest at prevailing interest rates based upon, at the Operating Partnership's option, LIBOR plus the applicable margin or the base rate, defined as the higher of the Federal Funds Rate plus .5 of 1%, the agent bank's prime rate, or LIBOR plus 1%, plus in each case the applicable margin. The applicable margin is dependent upon the Partnership's ratio of total debt to EBITDA on a consolidated basis, as defined in the Revolving Credit Facility.
Revolving Credit Facility, approximate interest rate at period end (in hundredths)	2.70%
Senior notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term borrowings	248,331	248,169
Aggregate principal amount	250,000
Stated interest rate (in hundredths)	7.375%
Percentage of principal amount at which debt was issued (in hundredths)	99.136%
Maturity date	Mar. 15, 2020
Percentage of the principal amount repurchase offer under change of control provision (in hundredths)	101.00%
Number of days after the consummation of the change of control that a rating decline may occur to trigger offer to repurchase debt	90 days
Unamortized discount	1,669	1,831
Amended Credit Agreement Due 2017 [Member]
Debt Instrument [Line Items]
Date public offering completed	2012-01-05
Revolving Credit Facility, term	5 years
Revolving Credit Facility, maximum amount	250,000
Standby letters of credit issued under the Revolving Credit Facility	100,000	100,000
Outstanding standby letters of credit, maximum expiration date of outstanding	Jan. 05, 2017
Interest rate swap agreement [Abstract]
Effective date	Jun. 25, 2013
Termination date	Jan. 05, 2017
Fixed interest rate (in hundredths)	1.63%
Debt Origination Costs [Abstract]
Capitalized debt origination costs	$ 2,420