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Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Selected Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 181,584 |  | $ 225,801 |  | $ 532,052 |  | $ 384,118 |  | $ 162,064 |  | $ 218,194 |  | $ 462,025 |  | $ 319,055 |  | $ 1,323,555 |  | $ 1,161,338 |  | $ 1,674,291 |
Gross profit for product, installation and service | 42,467 |  | 63,309 |  | 184,685 |  | 118,038 |  | 41,799 |  | 61,354 |  | 183,303 |  | 106,041 |  | 408,499 |  | 392,497 |  |  |
Operating income (loss) | (27,126) |  | (19,811) |  | 69,032 |  | 33,237 |  | (29,606) |  | (2,955) |  | 96,319 |  | 23,646 |  | 55,332 |  | 87,404 |  | 93,613 |
Income (loss) before income taxes | (29,092) |  | (21,766) |  | 66,996 |  | 31,138 |  | (31,923) |  | (4,993) |  | 94,113 |  | 21,475 |  | 47,276 |  | 78,672 |  | 70,391 |
Net income (loss) | (17,747) |  | (13,332) |  | 39,704 |  | 18,275 |  | (19,095) |  | (3,238) |  | 55,209 |  | 12,058 |  | 26,900 |  | 44,934 |  | 37,556 |
Limited Partner interest in net income (loss) | $ (17,644) |  | $ (13,253) |  | $ 39,471 |  | $ 18,170 |  | $ (18,985) |  | $ (3,219) |  | $ 54,896 |  | $ 11,990 |  | $ 26,744 |  | $ 44,682 |  | $ 37,344 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ (0.32) | [1] | $ (0.24) | [1] | $ 0.59 | [1] | $ 0.28 | [1] | $ (0.34) | [1] | $ (0.06) | [1] | $ 0.79 | [1] | $ 0.19 | [1] | $ 0.46 | [1],[2] | $ 0.70 | [1],[2] | $ 0.59 | [2]
[1] | 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.
[2] | See Note 17 - Earnings Per Limited Partner Units.

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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