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Partnership's Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 8.875% Senior Notes | Nov. 22, 2011 First Amendment
Debt Instrument [Line Items] |  |  |
Senior notes issuance date |  | Nov. 01, 2010 |
Interest accrued by public notes for each year |  | 8.875% |
Discount on notes |  | $ 0.6 |
Maximum debt allowed for acquisitions |  | 100 |
Restricted payments without passing certain financial tests |  | 22.0 |
Maturity of public notes due |  | Dec. 01, 2017 |
Interest payment frequency |  | Semi-annual interest payments on June 1 and December 1 of each year. |
Revolving credit facility expiry | Jun. 03, 2016 |  |
Increase in credit facility |  |  | 50
Maximum borrowing capacity under revolving credit facility | 350 |  | 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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