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Earnings Per Limited Partner Units | 12 Months Ended
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Sep. 30, 2011
Earnings Per Limited Partner Units [Abstract] |
Earnings Per Limited Partner Units | 17) Earnings Per Limited Partner Units The following table presents the net income allocation and per unit data in accordance with FASB ASC 260-10-45-60 Earnings per Share topic, Master Limited Partnerships subtopic (EITF 03-06):
Basic and Diluted Earnings Per Limited Partner: (in thousands, except per unit data) |  | Years Ended September 30, |
| 2011 |  |  | 2010 |  |  | 2009 |
Net income |  | $ | 24,344 |  |  | $ | 28,320 |  |  | $ | 131,038 |
Less General Partners' interest in net income |  |  | 115 |  |  |  | 128 |  |  |  | 561 |
Net income available to limited partners |  |  | 24,229 |  |  |  | 28,192 |  |  |  | 130,477 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 * |  |  | 574 |  |  |  | 1,258 |  |  |  | 22,252 |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 |  | $ | 23,655 |  |  | $ | 26,934 |  |  | $ | 108,225 |
Per unit data: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted net income available to limited partners |  | $ | 0.36 |  |  | $ | 0.40 |  |  | $ | 1.72 |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 * |  |  | 0.01 |  |  |  | 0.02 |  |  |  | 0.29 |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 |  | $ | 0.35 |  |  | $ | 0.38 |  |  | $ | 1.43 |
Weighted average number of Limited Partner units outstanding |  |  | 66,822 |  |  |  | 70,019 |  |  |  | 75,738 |
* | In any accounting period where the Partnership's aggregate net income exceeds its aggregate distribution for such period, the Partnership is required as per FASB ASC 260-10-45-60 to present net income per limited partner unit as if all of the earnings for the period were distributed, based on the contractual participation rights of the security to share in earnings, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. This allocation does not impact the Partnership's overall net income or other financial results.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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