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Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Selected Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 162,064 |  | $ 218,194 |  | $ 462,025 |  | $ 319,055 |  | $ 167,161 |  | $ 245,604 |  | $ 762,309 |  | $ 499,217 |  | $ 1,161,338 |  | $ 1,674,291 |  | $ 1,961,724 |
Gross profit for product, installation and service | 41,799 |  | 61,354 |  | 183,303 |  | 106,041 |  | 42,521 |  | 59,765 |  | 239,132 |  | 129,285 |  | 392,497 |  | 470,703 |  |  |
Operating income (loss) | (29,606) |  | (2,955) |  | 96,319 |  | 23,646 |  | (61,182) |  | (10,073) |  | 134,095 |  | 30,773 |  | 87,404 |  | 93,613 |  | 79,855 |
Income (loss) before income taxes | (31,923) |  | (4,993) |  | 94,113 |  | 21,475 |  | (72,428) |  | (13,970) |  | 129,876 |  | 26,913 |  | 78,672 |  | 70,391 |  | 61,399 |
Net income (loss) | (19,095) |  | (3,238) |  | 55,209 |  | 12,058 |  | (45,326) |  | (8,359) |  | 75,687 |  | 15,554 |  | 44,934 |  | 37,556 |  | 36,084 |
Limited Partner interest in net income (loss) | $ (18,985) |  | $ (3,219) |  | $ 54,896 |  | $ 11,990 |  | $ (45,069) |  | $ (8,312) |  | $ 75,259 |  | $ 15,466 |  | $ 44,682 |  | $ 37,344 |  | $ 35,881 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ (0.34) | [1] | $ (0.06) | [1] | $ 0.79 | [1] | $ 0.19 | [1] | $ (0.79) | [1] | $ (0.15) | [1] | $ 1.08 | [1] | $ 0.24 | [1] | $ 0.70 | [1],[2] | $ 0.59 | [1],[2] | $ 0.57 | [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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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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