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Partnership's Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	1 Months Ended		6 Months Ended
	Mar. 31, 2013	Nov. 30, 2011 First Amendment	Mar. 31, 2013 First Amendment	Mar. 31, 2013 8.875% Senior Notes
Debt [Line Items]
Senior notes issuance date				Nov. 01, 2010
Interest accrued by public notes for each year				8.875%
Discount on notes				$ 0.6
Maximum debt allowed for acquisitions				100
Restricted payments without passing certain financial tests				22
Maturity of public notes due				2017-12
Interest payment frequency				Semi-annual interest payments on June 1 and December 1 of each year.
Revolving credit facility expiry	2016-06
Increase in credit facility		50
Maximum borrowing capacity under revolving credit facility			250
Maximum borrowing capacity (heating season December to April) under revolving credit facility			350
Facility size that can be increased without consulting bank group	100
Maximum issuable letter of credit	$ 100

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