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Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Selected Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 222,362 |  | $ 326,511 |  | $ 892,241 |  | $ 520,610 |  | $ 177,608 |  | $ 262,524 |  | $ 785,139 |  | $ 516,525 |  | $ 1,961,724 |  | $ 1,741,796 |  | $ 1,497,588 |
Gross profit for product, installation and service | 37,507 |  | 60,682 |  | 199,645 |  | 108,590 |  | 33,519 |  | 54,907 |  | 162,011 |  | 102,691 |  | 406,424 |  | 353,128 |  |  |
Operating income (loss) | (40,188) |  | (10,797) |  | 93,953 |  | 36,887 |  | (19,800) |  | (8,001) |  | 75,229 |  | 18,577 |  | 79,855 |  | 66,005 |  | 58,259 |
Income (loss) before income taxes | (44,115) |  | (16,618) |  | 89,289 |  | 32,843 |  | (23,686) |  | (11,952) |  | 70,796 |  | 14,669 |  | 61,399 |  | 49,827 |  | 42,565 |
Net income (loss) | (25,828) |  | (9,592) |  | 52,216 |  | 19,288 |  | (13,937) |  | (7,588) |  | 41,679 |  | 9,752 |  | 36,084 |  | 29,906 |  | 25,989 |
Limited Partner interest in net income (loss) | $ (25,682) |  | $ (9,538) |  | $ 51,922 |  | $ 19,179 |  | $ (13,859) |  | $ (7,547) |  | $ 41,454 |  | $ 9,699 |  | $ 35,881 |  | $ 29,747 |  | $ 25,853 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ (0.45) | [1] | $ (0.17) | [1] | $ 0.75 | [1] | $ 0.29 | [1] | $ (0.24) | [1] | $ (0.13) | [1] | $ 0.58 | [1] | $ 0.15 | [1] | $ 0.57 | [1],[2] | $ 0.47 | [1],[2] | $ 0.40 | [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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