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Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data |
|  | Three Months Ended |  |  |  |  |
|  | Dec. 31, |  |  | Mar. 31, |  |  | Jun. 30, |  |  | Sep. 30, |  |  |  |  |
(in thousands - except per unit data) |  | 2017 |  |  | 2018 |  |  | 2018 |  |  | 2018 |  |  | Total |
Sales |  | $ | 436,834 |  |  | $ | 684,031 |  |  | $ | 327,354 |  |  | $ | 229,618 |  |  | $ | 1,677,837 |
Gross profit for product, installation and service |  |  | 124,499 |  |  |  | 216,079 |  |  |  | 79,377 |  |  |  | 43,387 |  |  |  | 463,342 |
Operating income (loss) |  |  | 31,066 |  |  |  | 85,473 |  |  |  | (8,817 | ) |  |  | (41,654 | ) |  |  | 66,068 |
Income (loss) before income taxes |  |  | 28,670 |  |  |  | 82,783 |  |  |  | (11,421 | ) |  |  | (36,925 | ) |  |  | 63,107 |
Net income (loss) |  |  | 30,182 |  |  |  | 54,778 |  |  |  | (8,005 | ) |  |  | (21,450 | ) |  |  | 55,505 |
Limited Partner interest in net income (loss) |  |  | 30,007 |  |  |  | 54,459 |  |  |  | (7,956 | ) |  |  | (21,319 | ) |  |  | 55,191 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (a) |  | $ | 0.45 |  |  | $ | 0.81 |  |  | $ | (0.15 | ) |  |  | (0.40 | ) |  | $ | 0.89 |
|  | Three Months Ended |  |  |  |  |
|  | Dec. 31, |  |  | Mar. 31, |  |  | Jun. 30, |  |  | Sep. 30, |  |  |  |  |
(in thousands - except per unit data) |  | 2016 |  |  | 2017 |  |  | 2017 |  |  | 2017 |  |  | Total |
Sales |  | $ | 384,118 |  |  | $ | 532,052 |  |  | $ | 225,801 |  |  | $ | 181,584 |  |  | $ | 1,323,555 |
Gross profit for product, installation and service |  |  | 118,038 |  |  |  | 184,685 |  |  |  | 63,309 |  |  |  | 42,467 |  |  |  | 408,499 |
Operating income (loss) |  |  | 33,237 |  |  |  | 69,032 |  |  |  | (19,811 | ) |  |  | (27,126 | ) |  |  | 55,332 |
Income (loss) before income taxes |  |  | 31,138 |  |  |  | 66,996 |  |  |  | (21,766 | ) |  |  | (29,092 | ) |  |  | 47,276 |
Net income (loss) |  |  | 18,275 |  |  |  | 39,704 |  |  |  | (13,332 | ) |  |  | (17,747 | ) |  |  | 26,900 |
Limited Partner interest in net income (loss) |  |  | 18,170 |  |  |  | 39,471 |  |  |  | (13,253 | ) |  |  | (17,644 | ) |  |  | 26,744 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (a) |  | $ | 0.28 |  |  | $ | 0.59 |  |  | $ | (0.24 | ) |  | $ | (0.32 | ) |  | $ | 0.46 |
(a) | The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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