Partnership's Debt (Parenthetical) (Detail) (8.875% Senior Notes, USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2014
8.875% Senior Notes
Debt Instrument [Line Items]
Senior notes issuance date	Nov. 01, 2010
Interest accrued by public notes for each year	8.875%
Discount on notes	$ 0.5
Maximum debt allowed for acquisitions	100
Restricted payments without passing certain financial tests	$ 22
Maturity of public notes due	Dec. 01, 2017
Interest payment frequency	Semi-annual interest payments on June 1 and December 1 of each year