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Partnership's Debt (Parenthetical) (Detail) (8.875% Senior Notes, USD $) In Millions, unless otherwise specified | 6 Months Ended
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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

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